Impact assessment system, impact assessment method, and program

Abstract

In order to more suitably determine the effect of an event on a structure, this effect determination system includes: a predicted displacement acquisition means for acquiring a predicted displacement of a structure on the earth's surface after an event related to a foundation of the structure, the predicted displacement being a displacement of the structure that is predicted on the basis of a pre-event displacement acquired prior to the event; a displacement acquisition means for acquiring a post-event displacement of the structure on the basis of an observation result acquired after the event; and an effect determination means for determining an effect of the event on the structure on the basis of the predicted displacement and the post-event displacement.

Description

[Technical Field]

[0001] The present invention relates to determining the effect of an event on a structure. [Background technology]

[0002] Patent Document 1 discloses a ground surface displacement observation device that analyzes measurements by a synthetic aperture radar before, during, and after tunnel construction to determine and output displacement of the ground surface. Patent Document 2 discloses a road shoulder collapse risk monitoring device that measures the shape of the road shoulder and the wheel position of a vehicle, calculates the road shoulder strength and wheel load at the measured wheel position, and calculates and notifies the risk of the road shoulder collapsing at the wheel position based on the calculated road shoulder strength and wheel load. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-132707 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-018132 Summary of the Invention [Problem to be solved by the invention]

[0004] The ground undergoes displacements such as subsidence or uplift even when there is no construction or other event. Furthermore, structures such as roads deteriorate over time. Patent Documents 1 and 2 do not disclose how to determine the impact of construction or other events on structures.

[0005] An object of the present invention is to provide an influence determination system and the like that can more appropriately determine the influence of an event on a structure. [Means for solving the problem]

[0006] An impact assessment system in one form of the present invention includes a predicted displacement acquisition means for acquiring a predicted displacement of a structure after an event, which is a displacement of a structure on the ground surface and is predicted based on a pre-event displacement acquired before an event related to the ground of the structure; a displacement acquisition means for acquiring a post-event displacement of the structure based on observation results of the ground surface observed after the event; and an impact assessment means for determining the impact of the event on the structure based on the predicted displacement and the post-event displacement.

[0007] In one embodiment of the present invention, an impact assessment method involves obtaining a predicted displacement of a structure after an event, which is predicted based on pre-event displacements obtained before an event related to the ground of the structure, obtaining a post-event displacement of the structure based on observations of the ground observed after the event, and determining the impact of the event on the structure based on the predicted displacement and the post-event displacement.

[0008] In one embodiment of the present invention, a recording medium records a program that causes a computer to execute the following processes: a process of obtaining a predicted displacement of a structure after an event, the predicted displacement being the displacement of a structure on the ground surface, the predicted displacement being based on pre-event displacements obtained before the event related to the ground of the structure; a process of obtaining a post-event displacement of the structure based on observations of the ground surface observed after the event; and a process of determining the impact of the event on the structure based on the predicted displacement and the post-event displacement. [Effects of the Invention]

[0009] According to the present invention, it is possible to more appropriately determine the impact of an event on a structure. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram showing an example of the configuration of an influence determination system according to a first embodiment. [Figure 2] FIG. 4 is a flowchart showing an example of the operation of the influence determination system according to the first embodiment. [Figure 3] FIG. 10 is a diagram illustrating an example of the configuration of an influence determination system according to a second embodiment. [Figure 4] FIG. 10 is a diagram illustrating an example of a range determined to be affected by an event. [Figure 5] FIG. 10 is a flowchart showing an example of the operation of the influence determination system according to the second embodiment. [Figure 6] FIG. 10 is a diagram illustrating an example of the configuration of an influence determination system according to a third embodiment. [Figure 7] FIG. 11 is a flowchart showing an example of the operation of the influence determination system according to the third embodiment. [Figure 8] FIG. 10 is a diagram showing an example of a display including sensor information and a surface layer state. [Figure 9] FIG. 2 is a block diagram showing an example of the hardware configuration of a computer device that constitutes the influence determination system. [Figure 10] FIG. 1 is a conceptual diagram of the entire system. DETAILED DESCRIPTION OF THE INVENTION

[0011] Next, embodiments of the present invention will be described with reference to the drawings. However, each embodiment of the present invention is not limited to the description of each drawing. Furthermore, each embodiment can be appropriately combined.

[0012] First Embodiment A first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram showing an example of the configuration of an influence determination system 11 according to the first embodiment. The influence determination system 11 includes a predicted displacement acquisition unit 150, a displacement acquisition unit 160, and an influence determination unit 180.

[0013] The predicted displacement acquisition unit 150 acquires predicted displacements of structures on the ground. Hereinafter, the predicted displacements are referred to as "predicted displacements." The structures may be, for example, roads, bridges, ramps, levees, piers, revetments, or runways. The structures may include multiple structures, such as roads and bridges. However, the structures are not limited to these. An event related to the ground of a structure is an occurrence that may affect the ground of the structure. For example, the event may be underground construction work under the structure, such as an underground tunnel, an underground shopping mall, an underground parking lot, a utility conduit, or an underground regulation pond. However, the event is not limited to underground construction work, and may also be construction work around the structure that affects the ground of the structure, such as construction work on a large building. Alternatively, the event may be ground construction work, such as embankment or cutting. Alternatively, the event is not limited to construction work, and may also be an accident affecting the ground, such as a water pipe burst. Alternatively, the event may be a natural disaster, such as heavy rain, flood, earthquake, or abnormal weather. Alternatively, the event may be a man-made disaster such as a large fire or explosion, etc. Alternatively, the event may be a change in infrastructure usage.

[0014] The predicted displacement acquired by the predicted displacement acquisition unit 150 is a displacement predicted based on displacement acquired before the start of an event related to the ground of the structure. Furthermore, the predicted displacement is the displacement of the structure after the start of the event. Hereinafter, "before the start of the event" may be simply referred to as "before the event." Furthermore, "after the start of the event" may be simply referred to as "after the event." In other words, "after the event" includes the period during and after the event. Furthermore, the displacement before the event is referred to as "pre-event displacement." In other words, the predicted displacement acquisition unit 150 acquires a predicted displacement of a structure on the ground that is predicted based on pre-event displacement.

[0015] The displacement acquisition unit 160 acquires the displacement of a structure based on observation results of the ground surface observed after an event. Hereinafter, the displacement of a structure based on observation results observed after an event will be referred to as "post-event displacement." For example, the displacement acquisition unit 160 acquires the observation results of a structure after an event from a ground observation system. The ground observation system is a system including an observation device that observes the ground surface, such as a synthetic aperture radar (SAR). The displacement acquisition unit 160 then analyzes the acquired observation results to acquire the post-event displacement of the structure. Alternatively, the displacement acquisition unit 160 may acquire the post-event displacement of the structure from the ground observation system. In the following description, these will be collectively described as "the displacement acquisition unit 160 acquires the post-event displacement of a structure on the ground surface." Note that the ground observation system will be described in more detail later.

[0016] The influence determination unit 180 determines the influence of an event on a structure based on the predicted displacement and the post-event displacement. The ground of a structure such as a road displaces in response to the properties of the ground's strata, for example, through subsidence. Such normal displacements can be predicted within a certain range based on predictions made based on past displacements. On the other hand, when ground displacement occurs due to an event such as tunnel construction beneath a structure, the displacement often falls outside the range predicted based on past displacements. Therefore, the influence determination unit 180 determines whether the displacement of the structure is due to the influence of the event based on the predicted displacement predicted based on the pre-event displacement and the post-event displacement.

[0017] Then, the influence determination unit 180 outputs the determination result. For example, the influence determination unit 180 outputs the determination result to a display device or storage device (not shown), such as a terminal device including a liquid crystal display. Note that the display device is not particularly limited as long as it can display the determination result.

[0018] That is, the impact assessment system 11 includes a predicted displacement acquisition unit 150, a displacement acquisition unit 160, and an impact assessment unit 180. The predicted displacement acquisition unit 150 acquires a predicted displacement. The predicted displacement is the displacement of a structure on the ground, and is the displacement of the structure after an event predicted based on pre-event displacements acquired before an event related to the ground of the structure. The displacement acquisition unit 160 acquires a post-event displacement of the structure based on observation results of the ground observed after the event. The impact assessment unit 180 assesses the impact of the event on the structure based on the predicted displacement and the post-event displacement.

[0019] The displacement of a structure is obtained from an analysis of the observation results of a ground surface observation system. However, the analysis using the observation results is not limited to an analysis of acquiring the ground surface displacement, but may also include an analysis of changes in ground surface intensity, causes of ground surface displacement, the magnitude of risk based on ground surface displacement, or differences from predictions based on past ground surface displacement. Therefore, the impact assessment system 11 may use changes in ground surface intensity, etc., instead of ground surface displacement, to assess the impact of an event. Even when changes in ground surface intensity, etc., are used instead of ground surface displacement, the displacement acquisition unit 160 may acquire changes in ground surface intensity, etc., from the ground surface observation system.

[0020] Furthermore, when the ground surface observation system makes observations using multiple frequencies (multispectrum), the displacement acquisition unit 160 can acquire the type of ground surface in addition to the displacement of the ground surface. Therefore, the impact assessment system 11 may determine the impact of an event using the type of ground surface in addition to the displacement of the ground surface. Note that the types of ground surface that can be acquired are determined according to the frequency used. For example, the types of ground surface include at least one of water surface, mud, garbage, dry soil, grassland, forest, farmland, and snow cover. In this case, the displacement acquisition unit 160 may also acquire the type of ground surface from the ground surface observation system. However, in the following description, as an example, the impact assessment system 11 determines the impact of an event using the displacement of the ground surface.

[0021] Methods for analyzing images of the Earth's surface include change extraction, time-series interferometry analysis, coherent change extraction, differential interferometry analysis, stereo matching, or a combination of these. Alternatively, a method for analyzing images of the Earth's surface includes applying a newly acquired image of the Earth's surface to an analytical model generated by machine learning using past images of the Earth's surface and surface displacements, thereby analyzing the displacement of the Earth's surface.

[0022] A case of tunnel construction beneath a road will be described as an example of impact assessment in the impact assessment system 11. In this description, the structures etc. are as follows: Structure: Road Event: Tunnel construction under the road Displacement: Road subsidence In this case, the predicted displacement acquisition unit 150 acquires, as the predicted displacement, the degree of subsidence after tunnel construction, predicted based on the subsidence of the road before the tunnel construction. Hereinafter, the degree of subsidence after tunnel construction, predicted based on the subsidence of the road before the tunnel construction, is referred to as the "predicted subsidence." The displacement acquisition unit 160 acquires, as the post-event displacement, the degree of subsidence of the road after tunnel construction. Hereinafter, the degree of subsidence after tunnel construction is referred to as the "post-construction subsidence." The impact determination unit 180 determines the impact of tunnel construction on the road based on the predicted subsidence and the post-construction subsidence. For example, if the post-construction subsidence is greater than the predicted subsidence by more than the accuracy of the prediction, the impact determination unit 180 determines that the subsidence of the road has been affected by the tunnel construction. Conversely, if the post-construction subsidence is greater than the predicted subsidence but within the accuracy of the prediction, or if the post-construction subsidence is smaller than the predicted subsidence, the impact determination unit 180 determines that the subsidence of the road has not been affected by the tunnel construction.

[0023] FIG. 2 is a flow diagram showing an example of the operation of the influence determination system 11 according to the first embodiment. The predicted displacement acquisition unit 150 acquires the predicted displacement of the structure (step S101). The predicted displacement is the displacement of the structure on the ground, and is a displacement predicted based on a pre-event displacement acquired before an event related to the ground of the structure. Furthermore, the predicted displacement is the displacement of the structure after the event. The displacement acquisition unit 160 acquires the post-event displacement of the structure (step S102). The influence determination unit 180 determines the influence of the event on the structure based on the predicted displacement and the post-event displacement (step S103).

[0024] In this way, the impact assessment system 11 uses predicted displacement based on pre-event displacement and post-event displacement to assess the impact of an event related to the ground on a surface structure. That is, when assessing the impact of an event on a structure, the impact assessment system 11 uses not only post-event displacement, which is displacement obtained based on observation results from a surface observation system, etc., but also predicted displacement predicted based on pre-event displacement. As a result, the impact assessment system 11 can more appropriately assess the impact of an event on a structure.

[0025] The displacement used by the influence determination system 11 is, for example, subsidence or uplift of a structure. However, the influence determination system 11 is not limited to displacement in the vertical direction relative to the ground, such as subsidence and uplift, and may also use displacement including a horizontal component.

[0026] The predicted displacement acquisition unit 150, the displacement acquisition unit 160, and the influence determination unit 180 of the influence assessment system 11 may use at least one of velocity, which is the rate of change of displacement, and acceleration, which is the rate of change of the velocity of displacement, in addition to or instead of displacement. Note that, for example, when the displacement of a certain point increases over time, the velocity of change of displacement is the rate at which the magnitude of the displacement changes. Furthermore, the velocity of displacement and the acceleration of displacement can be calculated based on accumulated data.

[0027] Second Embodiment The influence determination system 12 according to the second embodiment will be described with reference to the drawings. FIG. 3 is a diagram showing an example of the configuration of the influence determination system 12 according to the second embodiment. In FIG. 3, the influence determination system 12 is connected to a surface observation system 30 and a display device 40. The number of components in FIG. 3 is an example and is not limited to the number shown in FIG. 3. For example, the influence determination system 12 may be connected to a plurality of surface observation systems 30.

[0028] (1) Surface Observation System 30 The surface observation system 30 observes the ground surface, including structures, using an observation device and outputs the observation results to the impact assessment system 12. For example, the surface observation system 30 includes a SAR that observes the ground surface, including structures, and outputs an image of the ground surface as the observation result. The observation device in the surface observation system 30 is, for example, a SAR mounted on an artificial satellite, an aircraft, or an unmanned aerial vehicle (drone). However, the observation device is not limited to a SAR and may be, for example, an optical sensor or a laser measuring device. The surface observation system 30 may output observation results using multispectral rather than a single frequency. The surface observation system 30 may analyze the observation results and output the analysis results. For example, the surface observation system 30 may output the displacement of the ground surface as the analysis result.

[0029] (2) Impact Assessment System 12 The influence determination system 12 includes a predicted displacement acquisition unit 150 , a displacement acquisition unit 160 , a displacement storage unit 165 , and an influence determination unit 180 .

[0030] (2-1) Displacement acquisition unit 160 The displacement acquisition unit 160 acquires the pre-event displacement and post-event displacement of a structure on the ground surface. For example, the displacement acquisition unit 160 acquires the pre-event displacement and post-event displacement of the structure based on the observation results of a surface observation system 30 including a SAR that observes the ground surface including the structure. The displacement acquisition unit 160 may acquire the pre-event displacement and the post-event displacement at each of multiple positions. The displacement acquisition unit 160 may acquire the post-event displacement at each of multiple times after the event. The displacement acquisition unit 160 may acquire the pre-event displacement at each of multiple times before the event. In the following, to avoid complicated explanation, "pre-event displacement" and "post-event displacement" may be collectively referred to simply as "displacement" unless a particular distinction is needed.

[0031] The displacement acquisition unit 160 acquires the displacement based on the observation results of the ground surface observed by the ground surface observation system 30. In this way, the displacement is acquired based on the observation results. Therefore, in the following description, the time of the observation that is the basis of the analysis is used as the time of the displacement. The displacement acquisition unit 160 may acquire the displacement based on the observation results at multiple times. For example, the displacement acquisition unit 160 acquires images of the ground surface at two different times from the ground surface observation system 30. Then, the displacement acquisition unit 160 acquires the ground surface displacement between the two times from an analysis using the images of the ground surface at the two different times. The displacement acquired as a result of the analysis is the displacement from the previous observation to the later observation. Therefore, in this case, the time of the displacement is the time of the later observation.

[0032] When the surface observation system 30 outputs the displacement of the ground surface as a result of analyzing the observation results, the displacement acquisition unit 160 may acquire the displacement of the ground surface from the surface observation system 30. In this way, the displacement acquisition unit 160 may acquire the displacement by analyzing the observation results acquired from the surface observation system 30, or may acquire the displacement from the surface observation system 30. Therefore, similar to the first embodiment, in the following description, these will be collectively described as the displacement acquisition unit 160 acquiring the displacement of the structure on the ground surface from the surface observation system 30.

[0033] The method for acquiring the displacement is not limited. Various methods are conceivable as the method for acquiring the displacement. For example, when acquiring the displacement, the displacement acquisition unit 160 may output the position of the structure to the surface observation system 30 and acquire the displacement corresponding to the output position. Alternatively, the displacement acquisition unit 160 may acquire displacements including the displacement of the target structure and the displacements of other structures from the surface observation system 30 and extract the displacement of the target structure from the acquired displacements. When the displacement acquisition unit 160 acquires displacements of multiple positions, the detection ranges of at least some of the displacements may overlap. Alternatively, the displacement acquisition unit 160 may acquire displacements stored in a storage device (not shown) as at least some of the displacements.

[0034] When the structure is wider than the spatial resolution of the displacement, the displacements at multiple positions correspond to the structure. Therefore, when the structure is wider than the spatial resolution of the displacement, the displacement acquisition unit 160 may acquire the displacements at each of the multiple positions corresponding to the structure so as to cover the entire structure. Note that the spatial resolution is the minimum distance at which two objects that are close to each other can be distinguished as two separate objects. For example, the spatial resolution of the displacement is the minimum distance between the two displacements.

[0035] The displacement acquisition unit 160 may acquire the displacement within a partial range of the structure. For example, if the structure is a road, the displacement acquisition unit 160 may acquire the displacement related to a pre-specified road. Alternatively, if the range in which an event is occurring is specified, the displacement acquisition unit 160 may acquire the displacement of the range in which the event is occurring.

[0036] Then, the displacement acquisition unit 160 stores the pre-event displacement in the displacement storage unit 165. Furthermore, the displacement acquisition unit 160 outputs the post-event displacement to the influence determination unit 180. The displacement acquisition unit 160 may store the post-event displacement in the displacement storage unit 165. Alternatively, the displacement acquisition unit 160 may output the pre-event displacement to the influence determination unit 180.

[0037] (2-2) Displacement storage unit 165 The displacement storage unit 165 stores the pre-event displacements acquired by the displacement acquisition unit 160. When storing pre-event displacements at multiple times, the displacement storage unit 165 may store the pre-event displacements as history. When the displacement acquisition unit 160 acquires pre-event displacements at multiple positions, the displacement storage unit 165 may store the pre-event displacements at each of the multiple positions. Then, the displacement storage unit 165 outputs the pre-event displacements to the predicted displacement acquisition unit 150. When storing post-event displacements, the displacement storage unit 165 may output the post-event displacements to the influence determination unit 180.

[0038] (2-3) Predicted Displacement Acquisition Unit 150 The predicted displacement acquisition unit 150 acquires a predicted displacement based on the pre-event displacement stored in the displacement storage unit 165. The predicted displacement acquisition unit 150 may acquire a predicted displacement by, for example, applying the pre-event displacement to a prediction model acquired through machine learning using past displacements. However, the method by which the predicted displacement acquisition unit 150 acquires a predicted displacement is not limited thereto. For example, the predicted displacement acquisition unit 150 may acquire a predicted displacement by applying the pre-event displacement to a predetermined prediction formula. Alternatively, the predicted displacement acquisition unit 150 may output the pre-event displacement to a component or device (not shown) and acquire the predicted displacement from that component or device. For example, the predicted displacement acquisition unit 150 acquires a predicted displacement of a structure after tunnel construction based on the pre-event displacement acquired before the tunnel construction. If the displacement storage unit 165 stores pre-event displacements at multiple positions, the predicted displacement acquisition unit 150 may acquire a predicted displacement at each of the multiple positions.

[0039] The predicted displacement acquisition unit 150 acquires a predicted displacement at a certain specified time point as the predicted displacement to be acquired. Hereinafter, the specified time point will be referred to as the "time point of prediction." The time point of prediction used by the predicted displacement acquisition unit 150 is not limited. For example, the predicted displacement acquisition unit 150 may use a preset time point or a time point specified by the user as the time point of prediction for the predicted displacement. Alternatively, the predicted displacement acquisition unit 150 may use the time of observation used to acquire the post-event displacement, i.e., the time of the post-event displacement, as the time point of prediction. The predicted displacement acquisition unit 150 may acquire predicted displacements at multiple time points after the event, rather than at a single time point.

[0040] (2-4) Impact determination section 180 The impact determination unit 180 determines the impact of an event on a structure based on the predicted displacement and the post-event displacement. For example, if the post-event displacement is greater than the predicted displacement by a predetermined value or more, the impact determination unit 180 determines that the event is affecting the structure. The predetermined value may be determined as appropriate depending on, for example, the structure and the errors in the displacement determination and prediction. For example, if the event is tunnel construction, the impact determination unit 180 compares the predicted subsidence and the post-construction subsidence within the tunnel construction area. If the post-construction subsidence is greater than the predicted subsidence, the impact determination unit 180 determines that the tunnel construction is having an impact. The impact determination unit 180 may determine that the tunnel construction is having an impact if the post-construction subsidence is greater than the predicted subsidence by a predetermined value or more, taking into account errors in the prediction and determination.

[0041] The impact determination unit 180 may determine the range affected by the event. For example, the impact determination unit 180 may determine the range where the post-event displacement is greater than the predicted displacement by a predetermined value or more as the range affected by the event. For example, the impact determination unit 180 may determine the range within a tunnel construction area where the post-event displacement is greater than the predicted displacement by a predetermined value or more as the range affected by the tunnel construction. FIG. 4 is a diagram showing an example of a range determined to be affected by the event. The left side of FIG. 4 is the predicted displacement. The right side of FIG. 4 is the post-event displacement. Comparing the displacements shown on the left and right sides of FIG. 4, the displacement in the range surrounded by the dashed line at the top of the post-event displacement on the right side of FIG. 4 is an unexpected displacement and corresponds to the range of tunnel construction. Therefore, the impact determination unit 180 determines this range as the range affected by the tunnel construction. The impact determination unit 180 may also determine the range not affected by the event. For example, the influence determination unit 180 may determine that a range in which the post-event displacement is larger than the predicted displacement but the difference is smaller than a predetermined value, and a range in which the post-event displacement is smaller than the predicted displacement, are not affected by the tunnel construction. Note that the classification of displacement is not limited to "large, medium, and small" as shown in Figure 4, and may be classified using any scale. For example, the displacement may be classified in increments of 1 mm.

[0042] The impact determination unit 180 may determine the impact of an event based on the relationship between predicted displacement and post-event displacement at multiple locations. For example, if the predicted displacement acquisition unit 150 acquires predicted displacements at multiple locations and the displacement acquisition unit 160 acquires post-event displacements at multiple locations, the impact determination unit 180 may determine the impact of an event based on the predicted displacement and post-event displacement at each of the multiple locations. Furthermore, the impact determination unit 180 may determine the impact of an event based on the post-event displacement, the predicted displacement, and the range of the event. As an example, a case will be described in which subsidence is used as the displacement. For example, if the range in which post-construction subsidence is larger than the predicted subsidence roughly overlaps with the range of the construction and has a similar shape, it is highly likely that the subsidence is caused by the construction. Therefore, in such a case, the impact determination unit 180 may determine that the subsidence is affected by the construction. In this way, when the post-event displacement and predicted displacement at multiple locations are used, the impact determination unit 180 can more appropriately determine the impact of an event.

[0043] Alternatively, the impact determination unit 180 may determine the impact of an event using a gradient of displacement calculated from displacements at multiple positions. When a gradient is used, the impact determination unit 180 may use the direction of the gradient for the determination. For example, the impact determination unit 180 obtains a gradient of predicted displacement based on predicted displacements at multiple positions. Hereinafter, the gradient of predicted displacement is referred to as a "predicted gradient." Furthermore, the impact determination unit 180 obtains a gradient of post-event displacement based on post-event displacements at multiple positions. Hereinafter, the gradient of displacement obtained based on post-event displacement is referred to as a "post-event gradient." Then, the impact determination unit 180 may determine the impact of an event based on the predicted gradient and the post-event gradient. For example, if positions with a large difference between the predicted gradient and the post-event gradient are aligned along the direction of progress of an event, such as the direction of progress of tunnel construction, the impact determination unit 180 may determine that there is an impact of the event.

[0044] The gradient direction used for the determination may be a direction different from the progression direction of the event. For example, the impact determination unit 180 may determine the impact of the event based on the predicted gradient and post-event gradient in a direction perpendicular to the progression direction of the event. For example, if the difference between the predicted gradient and post-event gradient in the width direction of the tunnel construction increases from the periphery toward the center of the tunnel construction, the impact determination unit 180 may determine that there is an impact of the event. Alternatively, the gradient direction is not limited to one direction. For example, the impact determination unit 180 may determine the impact of the event based on the predicted gradient and post-event gradient for at least a portion of the entire perimeter of the construction range.

[0045] The impact determination unit 180 may determine the impact of an event based on the relationship between the predicted displacement and the post-event displacement over multiple time periods, or the change over time between the predicted displacement and the post-event displacement. For example, when the predicted displacement acquisition unit 150 acquires predicted displacements at multiple time periods and the displacement acquisition unit 160 acquires corresponding post-event displacements at multiple time periods, the impact determination unit 180 may determine the impact of an event based on the predicted displacement and the post-event displacement at each of the multiple time periods. For example, when the difference between the predicted subsidence and the post-construction subsidence increases as multiple time periods pass after the event, the impact determination unit 180 may determine that the subsidence is affected by the construction work.

[0046] The influence determination unit 180 may determine the influence of an event based on the relationship and temporal change between the predicted displacement and the post-event displacement at multiple locations and multiple times. For example, if the range where the difference between the predicted subsidence and the post-construction subsidence is large expands in the excavation direction of the tunnel construction as the tunnel construction progresses, it is highly likely that the subsidence is being affected by the tunnel construction. Therefore, if the range where the difference between the predicted subsidence and the post-construction subsidence is large expands in the excavation direction of the tunnel construction as time passes as the tunnel construction progresses, the influence determination unit 180 may determine that the subsidence is being affected by the construction.

[0047] The impact determination unit 180 may use other information in determining the impact. For example, the impact determination unit 180 may use at least one of the following information in determining the impact: the strata of the ground of the structure, the area where the event is occurring, the topography, geology, soil, weather, type of construction, and construction method around the structure. The topography may be an artificial flat land, cut land, reclaimed land, fill land, or a gravel mined area. The geology may be soil, sedimentary rock, igneous rock, lava, metamorphic rock, mineral veins, etc. The weather may be sunny or rainy, temperature, humidity, precipitation, and snowfall. The type of construction may be civil engineering work, building construction, paving work, water facility construction, etc. The construction method may be a shield method, a tunnel boring machine (TBM) method, a New Austrian Tunneling Method (NATM), etc.

[0048] The influence determination unit 180 then outputs the determination result. For example, the influence determination unit 180 outputs the determination result to the display device 40 or the like. Note that the display device 40 is not particularly limited as long as it is a device that displays the determination result. Furthermore, the content of the determination result output by the influence determination unit 180 is not particularly limited. For example, the influence determination unit 180 may output the determination result for the entire structure as the determination result. Alternatively, the influence determination unit 180 may output the determination result for a part of the structure. For example, the influence determination unit 180 may output the determination result for the range determined to be affected by the event as the determination result. The influence determination unit 180 may output at least one of the predicted displacement and the post-event displacement. For example, the influence determination unit 180 may output the determination result for the range determined to be affected by the event, the predicted displacement, and the post-event displacement.

[0049] (2-5) Impact Assessment System 12 The operation of the influence determination system 12 will be described with reference to the drawings. FIG. 5 is a flow diagram showing an example of the operation of the influence determination system 12 according to the second embodiment. The displacement acquisition unit 160 acquires a pre-event displacement (step S111). Then, the displacement acquisition unit 160 stores the pre-event displacement in the displacement storage unit 165. The predicted displacement acquisition unit 150 acquires a predicted displacement based on the pre-event displacement (step S112). The displacement acquisition unit 160 acquires a post-event displacement (step S102). The influence determination unit 180 determines the influence of the event on the structure based on the predicted displacement and the post-event displacement (step S104).

[0050] The impact assessment system 12 may repeat the following operations in accordance with the management cycle of the structure. The displacement acquisition unit 160 reacquires the post-event displacement. The predicted displacement acquisition unit 150 reacquires the predicted displacement at the time corresponding to the post-event displacement. The impact assessment unit 180 then re-evaluates the impact of the event based on the reacquired predicted displacement and post-event displacement. In this case, for the next operation, the displacement acquisition unit 160 may add the reacquired post-event displacement to the pre-event displacement. In this case, the predicted displacement acquisition unit 150 may use the pre-event displacement to which the currently acquired post-event displacement has been added when acquiring the next predicted displacement.

[0051] Alternatively, the impact assessment system 12 may repeat its operation in accordance with a predetermined cycle, such as monthly or weekly, or the cycle of observations used in analyzing displacement. Alternatively, the impact assessment system 12 may repeat its operation in response to an instruction from a user. Similar to the impact assessment system 11, the impact assessment system 12 may use at least one of velocity, which is the rate of change of displacement, and acceleration, which is the rate of change of the velocity of displacement, in addition to or instead of displacement.

[0052] (3)Display device The display device 40 displays the determination result regarding the impact of the event from the impact determination unit 180. For example, the display device 40 may display the determination result of the impact of tunnel construction on a road, as shown on the right side of FIG. 4. In this way, the type of device and the installation location of the display device 40 are not important as long as it can display the determination result. Furthermore, the relationship between the impact determination system 12 and the display device 40 is not particularly limited.

[0053] <Third embodiment> An influence determination system 13 according to the third embodiment will be described with reference to the drawings. Fig. 6 is a diagram showing an example of the configuration of the influence determination system 13 according to the third embodiment. In Fig. 6, compared to the influence determination system 12, the influence determination system 13 is further connected to a sensor information measuring device 20. Therefore, the following description will mainly focus on the sensor information measuring device 20 and the influence determination system 13.

[0054] (1) Sensor information measuring device 20 The sensor information measuring device 20 measures sensor information related to the surface of a structure. For example, the sensor information measuring device 20 is mounted on or towed by a mobile object moving on or near the top surface of the structure and measures sensor information related to the surface of the structure. For example, the sensor information measuring device 20 is a dashcam mounted on a vehicle, which is an example of a mobile object, and measures road images, which are an example of sensor information. Alternatively, the sensor information measuring device 20 may be a vibrometer that measures vehicle vibrations or an accelerometer that measures acceleration due to vehicle vibrations. However, the sensor information measuring device 20 is not limited to a dashcam, vibrometer, or accelerometer mounted on a vehicle. For example, the sensor information measuring device 20 may be a fixed device such as a fixed camera installed on or beside a road. The sensor information measuring device 20 may be a device that can change performance related to measuring sensor information, such as the shooting direction and focal length.

[0055] It should be noted that the moving body equipped with the sensor information measuring device 20 is not limited to a vehicle. For example, an unmanned aerial vehicle (drone) may move with the sensor information measuring device 20 installed. Alternatively, a person may carry the sensor information measuring device 20, such as a wearable drive recorder.

[0056] The sensor information measured by the sensor information measuring device 20 is information related to the surface of a structure. For example, the sensor information is an image of the surface of a structure, such as an image of the road surface. However, the sensor information is not limited to an image. For example, the sensor information may be the magnitude, speed, or acceleration of vibrations generated due to unevenness of the road surface. Alternatively, the sensor information may be three-dimensional data such as data measured using a radar (Radio Detecting and Ranging (RADAR)) or a lidar (Light Detection and Ranging (LiDAR)). The sensor information may not be a single piece of information, but may include multiple pieces of information, such as a combination of an image and acceleration. In the following description, as an example, a drive recorder is used as the sensor information measuring device 20, and an image of the surface of a structure is used as the sensor information. Furthermore, a vehicle is used as an example of a moving object.

[0057] The sensor information may be accompanied by other information. Examples of information that accompanies the sensor information will be described below. Identification information Information for identifying the sensor information may be attached to the sensor information. For example, an identifier may be attached to the sensor information. Alternatively, when measurements are taken at multiple locations, the locations at which the sensor information was measured may be attached to the sensor information. Note that the location may be a two-dimensional location such as latitude and longitude, or a three-dimensional location including height. Alternatively, when measurements are taken at multiple times, the times at which the sensor information was measured may be attached to the sensor information. For example, the influence determination system 13 may identify the sensor information using the location and time included in the sensor information. In this way, the location and time attached to the sensor information may be used to identify the sensor information. Measurement device information The sensor information may be accompanied by information that affects the measured sensor information. For example, information related to the sensor information measuring device 20 may be accompanied by the sensor information. For example, the information related to the sensor information measuring device 20 may include at least one of the device name, model name, installation position, and shooting direction of the sensor information measuring device 20. Alternatively, information related to the sensor of the sensor information measuring device 20 may be accompanied by the sensor information. For example, the information related to the sensor may include at least one of the type, specifications, and performance of the sensor. For example, if the sensor is a camera, the information related to the sensor may include at least one of the focal length, aperture, aperture, shutter speed, and number of pixels of the camera. Mobile information If the sensor information measuring device 20 is mounted on a moving object, information related to the moving object may accompany the sensor information. For example, the information related to the moving object may include at least one of the name, model number, and type of the moving object. Alternatively, information related to the operation of the moving object may accompany the sensor information. For example, if the moving object is a vehicle, the information related to the operation of the moving object may include information on at least one of the operation of the accelerator pedal, brake pedal, shift lever, steering wheel, wipers, turn signals, and opening and closing of doors. ·Nearby information The sensor information may be accompanied by information about the surroundings at the time the sensor information is measured. The surrounding information may include, for example, at least one of the surrounding weather, temperature, humidity, illuminance, congestion level, and sound. Worker information Information related to the worker who measured the sensor information may accompany the sensor information. For example, the information related to the worker may include at least one of the worker's name and identifier. Alternatively, information added by the worker may accompany the sensor information. For example, the information added by the worker may include comments related to at least one of the structure and the sensor information.

[0058] (2) Impact Assessment System 13 The influence determination system 13 has the same configuration as the influence determination system 12, but includes an influence determination unit 183 instead of the influence determination unit 180, and further includes a sensor information acquisition unit 120, a sensor information storage unit 125, a predicted state acquisition unit 110, and a state determination unit 130. Therefore, the following description will focus on the configuration and operation that are different from the second embodiment, and description of the configuration and operation that are the same as the second embodiment will be omitted as appropriate. Note that the predicted displacement acquisition unit 150 may acquire a predicted displacement as in the first embodiment, or may acquire a predicted displacement based on the displacement stored in the displacement storage unit 165 as in the second embodiment.

[0059] (2-1) Sensor Information Acquisition Unit 120 The sensor information acquisition unit 120 acquires sensor information measured before an event and sensor information measured after an event. Hereinafter, the sensor information measured before an event will be referred to as "pre-event sensor information." Furthermore, the sensor information measured after an event will be referred to as "post-event sensor information." In other words, the sensor information acquisition unit 120 acquires pre-event sensor information and post-event sensor information. For example, the sensor information acquisition unit 120 acquires pre-event sensor information and post-event sensor information related to the surface of a structure, acquired by the sensor information measurement device 20 mounted on a mobile object. The sensor information acquisition unit 120 may acquire pre-event sensor information and post-event sensor information at each of multiple positions. The sensor information acquisition unit 120 may acquire post-event sensor information at each of multiple times after the event. The sensor information acquisition unit 120 may acquire pre-event sensor information at each of multiple times before the event. Hereinafter, to avoid complication of explanation, "pre-event sensor information" and "post-event sensor information" may be collectively referred to simply as "sensor information" unless a distinction is particularly needed. The sensor information acquisition unit 120 may acquire the time when the sensor information is measured. Hereinafter, the time when the sensor information is measured will be referred to as the "time of the sensor information."

[0060] The method for acquiring sensor information is not limited. Various methods are conceivable for acquiring sensor information. For example, the sensor information acquisition unit 120 may output the position of a structure to the sensor information measuring device 20 and acquire sensor information corresponding to the output position. Alternatively, the sensor information acquisition unit 120 may acquire sensor information including sensor information of the target structure and sensor information of other structures from the sensor information measuring device 20, and extract sensor information corresponding to the position of the structure from the acquired sensor information. The sensor information acquisition unit 120 may acquire pre-event sensor information and post-event sensor information at each of multiple positions corresponding to the structure so as to cover the entire structure.

[0061] Alternatively, the sensor information acquisition unit 120 may acquire sensor information within a partial range of the structure. For example, if the structure is a road, the sensor information acquisition unit 120 may acquire sensor information related to a pre-specified road. Alternatively, if the range in which an event is occurring is specified, the sensor information acquisition unit 120 may acquire sensor information within the range in which the event is occurring.

[0062] When the sensor information acquisition unit 120 acquires sensor information from multiple positions, the detection ranges of at least some of the sensor information may overlap. Alternatively, the sensor information acquisition unit 120 may acquire sensor information stored in a storage device (not shown) as at least some of the sensor information. When the influence determination system 13 is connected to multiple sensor information measuring devices 20, the sensor information acquisition unit 120 may acquire sensor information from the multiple sensor information measuring devices 20. In this case, the sensor information acquisition unit 120 may acquire pre-event sensor information and post-event sensor information from different sensor information measuring devices 20.

[0063] Then, the sensor information acquisition unit 120 stores the pre-event sensor information in the sensor information storage unit 125. Furthermore, the sensor information acquisition unit 120 outputs the post-event sensor information to the state determination unit 130. The sensor information acquisition unit 120 may store the post-event sensor information in the sensor information storage unit 125. Alternatively, the sensor information acquisition unit 120 may output the pre-event sensor information to the state determination unit 130.

[0064] (2-2) Sensor information storage unit 125 The sensor information storage unit 125 stores pre-event sensor information acquired by the sensor information acquisition unit 120. When storing pre-event sensor information at multiple times, the sensor information storage unit 125 may store the pre-event sensor information as history. When the sensor information acquisition unit 120 acquires pre-event sensor information at multiple positions, the sensor information storage unit 125 may store the pre-event sensor information at each of the multiple positions. Then, the sensor information storage unit 125 outputs the pre-event sensor information to the predicted state acquisition unit 110. When storing post-event sensor information, the sensor information storage unit 125 may output the post-event sensor information to the state determination unit 130.

[0065] (2-3) Predicted State Acquisition Unit 110 The predicted state acquisition unit 110 acquires a predicted surface state of a structure after an event, which is sensor information related to the surface of the structure and predicted based on sensor information measured before the event. For example, the predicted state acquisition unit 110 acquires a predicted surface state after an event based on pre-event sensor information stored in the sensor information storage unit 125. Hereinafter, the surface state predicted based on pre-event sensor information will be referred to as a "predicted surface state." For example, the predicted state acquisition unit 110 may acquire a predicted surface state by applying pre-event sensor information to a prediction model acquired through machine learning using past sensor information and surface state. Alternatively, the predicted state acquisition unit 110 may acquire a predicted surface state by applying pre-event sensor information to a predetermined prediction formula. Alternatively, the predicted state acquisition unit 110 may acquire a predicted surface state from an external device (not shown). For example, the predicted state acquisition unit 110 may output pre-event sensor information to a component or device (not shown) and acquire a predicted surface state from the component or device. Specifically, for example, the predicted state acquisition unit 110 acquires the crack rate after the tunnel construction, which is predicted based on images of the road measured before the tunnel construction. If the sensor information storage unit 125 stores pre-event sensor information at multiple positions, the predicted state acquisition unit 110 may acquire predicted surface conditions at the multiple positions.

[0066] The predicted state acquisition unit 110 acquires the surface state at a specific time point as the predicted surface state to be acquired. Hereinafter, the specified time point will be referred to as the "time point of prediction." The time point of prediction used by the predicted state acquisition unit 110 is not limited. For example, the predicted state acquisition unit 110 may use a preset time point or a time point specified by the user as the time point of prediction. Alternatively, the predicted state acquisition unit 110 may use the time point at which the post-event sensor information acquired by the sensor information acquisition unit 120 was measured as the time point of prediction. In other words, the predicted state acquisition unit 110 may acquire the predicted surface state at a time point corresponding to the time of the post-event sensor information. The predicted state acquisition unit 110 may acquire predicted surface states at multiple time points after the event, rather than at a single time point.

[0067] The predicted state acquisition unit 110 may acquire a predicted surface state based on a surface state determined based on sensor information measured before an event, rather than pre-event sensor information. Hereinafter, a surface state determined based on sensor information measured before an event is referred to as a "pre-event surface state." For example, the predicted state acquisition unit 110 may acquire a predicted surface state based on a pre-event surface state determined by the state determination unit 130 based on stored pre-event sensor information. In this case, too, the predicted state acquisition unit 110 may acquire a predicted surface state using a predetermined prediction model or prediction formula. Alternatively, the predicted state acquisition unit 110 may acquire a predicted surface state using a configuration or device not shown.

[0068] The "surface layer" of a structure refers to the area where the condition can be confirmed from the surface of the structure. Note that the surface of a structure is not limited to the road surface on which vehicles pass, but may include any surface that is in contact with the outside, such as the side walls and ceiling of a tunnel. For example, the surface layer refers to the area including the surface and a predetermined depth from the surface. For example, if a structure includes multiple layers, the surface layer refers to the surface layer of the structure, or a predetermined layer including the surface layer. Furthermore, hereinafter, the portion of the structure excluding the surface layer will be referred to as the "deep layer." For example, if the structure is an asphalt-paved road, the surface layer is the asphalt layer. In this case, the deep layer is, for example, the crushed stone layer, the roadbed, and the road body. However, the surface layer and the deep layer are not limited to the above. For example, if the structure is an asphalt-paved road, the surface layer may be the asphalt layer and the crushed stone layer. In this case, the deep layer is the roadbed and the road body.

[0069] The "surface condition" refers to the condition of the surface of a structure. For example, the "surface condition" is determined based on sensor information. For example, the determined surface condition refers to road deterioration. Road deterioration is, for example, at least one of cracks, ruts, potholes, deterioration of road seals, and fraying of the periphery of the seals. The surface condition may also refer to the type of deterioration. For example, the surface condition may refer to the type of deterioration, such as vertical, horizontal, or tortoiseshell cracks. Alternatively, the surface condition may refer to deterioration of features on the road surface, such as worn road lines and road markings, or damaged markings. Alternatively, the surface condition may refer to surface changes, such as wear of the surface, rather than damage, such as cracks. Alternatively, the surface condition may refer to the condition of processed portions of the road surface, such as straight drainage grooves in the road surface or circular grooves for anti-slip measures on slopes. Alternatively, the "degree of deterioration," which refers to the degree of deterioration, may be used as the surface condition. The general levels of deterioration for roads, runways, etc. are as follows: Crack rate: The crack area divided by the area of ​​the area under investigation. Rutting depth: The height from the rut to the convex part within a specified range. Note that 20m is often used as the specified range. International Roughness Index (IRI): An evaluation index for the unevenness of paved roads proposed by the World Bank in 1986. BBI (Boeing Bump Index): A flatness index adopted by the US Federal Aviation Administration in 2009.

[0070] (2-4) State Determination Unit 130 The state determination unit 130 determines the surface state of the structure after the event based on the post-event sensor information. Specifically, the state determination unit 130 determines the deterioration state of the surface layer. Hereinafter, the surface state of the structure after the event is referred to as the "post-event surface state." For example, the state determination unit 130 may acquire post-event sensor information from the sensor information acquisition unit 120 and determine the post-event surface state based on the acquired post-event sensor information. Alternatively, when determining the post-event surface state, the state determination unit 130 may acquire post-event sensor information from the sensor information acquisition unit 120, or may acquire post-event sensor information stored by the sensor information storage unit 125. When the sensor information acquisition unit 120 acquires post-event sensor information from multiple positions, the state determination unit 130 may determine the post-event surface state at each of the multiple positions.

[0071] The state determination unit 130 may determine the post-event surface state based on the post-event sensor information measured at the specified time. For example, the state determination unit 130 may acquire post-event sensor information at the time specified by the user from the sensor information storage unit 125 and determine the post-event surface state based on the acquired post-event sensor information. If the sensor information acquisition unit 120 has acquired post-event sensor information at multiple times after the event, the state determination unit 130 may determine the post-event surface state at each of the multiple times based on the post-event sensor information at each of the multiple times after the event.

[0072] (2-5) Impact determination section 183 The impact determination unit 183 determines the impact of an event on a structure, similar to the impact determination unit 180. However, the impact determination unit 183 determines the impact of an event on a structure based on a predicted surface state and a post-event surface state in addition to the predicted displacement and post-event displacement. For example, in addition to the predicted subsidence and post-construction subsidence, the impact determination unit 183 may use a crack rate after tunnel construction predicted based on an image of the road before the tunnel construction and a crack rate determined based on an image of the road after the tunnel construction. Hereinafter, the crack rate after tunnel construction predicted based on an image of the road before the tunnel construction will be referred to as the "predicted crack rate." Also, below, the crack rate determined based on an image of the road after the tunnel construction will be referred to as the "post-construction crack rate." Specifically, for example, the impact determination unit 183 may determine that the structure has been affected by construction when both the difference between the predicted subsidence and post-event subsidence and the difference between the predicted crack rate and the post-construction crack rate are large.

[0073] The impact determination unit 183 may determine the impact of an event based on the relationship between predicted displacement and post-event displacement at multiple locations. For example, the impact determination unit 183 may use the predicted surface state and the post-event surface state at each of multiple locations. The impact determination unit 183 may determine the impact of an event based on the relationship between the predicted surface state and the post-event surface state at each of multiple times, or the temporal change between the predicted displacement and the post-event displacement. For example, if the difference between the predicted surface state and the post-event surface state increases over multiple times after the event, the impact determination unit 183 may determine that the displacement is affected by construction. The impact determination unit 183 may determine the impact of an event based on the relationship and temporal change between the predicted surface state and the post-event surface state at multiple locations and multiple times. For example, if the range where the difference between the predicted crack rate and the post-event crack rate is large expands as the event progresses, the impact determination unit 183 may determine that the structure is affected by the event.

[0074] The influence determination unit 183 may output at least one of the sensor information and the surface state in addition to the determination result. For example, the influence determination unit 183 may output the determination result of the range determined to be affected by the event, the predicted surface state, and the post-event surface state. Alternatively, the influence determination unit 183 may output the determination result of the range determined to be affected by the event, the pre-event sensor information, and the post-event sensor information.

[0075] In addition, repair work on roads where cracks have occurred but subsidence has not occurred will be repair work on the surface layer, such as the asphalt layer. On the other hand, repair work on roads where cracks have not occurred but subsidence has occurred will be repair work on deeper layers, such as the roadbed or roadbed. Alternatively, roads where there is no deterioration such as cracks on the surface but subsidence is more advanced than predicted may be susceptible to sinkholes in the near future. In this case, users may close that section of the road in advance or carry out repair work on that section in advance. In this way, if there is a large change in either the surface condition or the displacement, the measures, such as repair work, related to that section may differ. In other words, information on the location or range where either the surface condition or the displacement is determined to be affected by an event is useful information for users.

[0076] Therefore, the influence determination unit 183 may output a position or range where it is determined that there is a large change in either the surface state or the displacement. For example, the influence determination unit 183 may output a range where the difference between the predicted crack rate and the crack rate after the event is large and the difference between the predicted displacement and the post-event displacement is small. Alternatively, the influence determination unit 183 may output a range where the difference between the predicted crack rate and the crack rate after the event is small and the difference between the predicted displacement and the post-event displacement is large.

[0077] (2-6) Impact Assessment System 13 FIG. 7 is a flow diagram showing an example of the operation of the influence determination system 13 according to the third embodiment. The displacement acquisition unit 160 acquires pre-event displacement (step S111). Then, the displacement acquisition unit 160 stores the pre-event displacement in the displacement storage unit 165. The predicted displacement acquisition unit 150 acquires predicted displacement based on the pre-event displacement (step S112). The displacement acquisition unit 160 acquires post-event displacement (step S102). The sensor information acquisition unit 120 acquires pre-event sensor information (step S121). Then, the sensor information acquisition unit 120 stores the pre-event sensor information in the sensor information storage unit 125. The predicted state acquisition unit 110 acquires predicted surface state based on the pre-event sensor information (step S122). The sensor information acquisition unit 120 further acquires post-event sensor information (step S123). The state determination unit 130 determines the post-event surface state of the structure based on the post-event sensor information (step S124). The influence determination unit 183 determines the influence of the event on the structure based on the predicted surface state, the post-event surface state, the predicted displacement, and the post-event displacement (step S125). Either the operations from steps S111 to S102 or the operations from steps S121 to S124 may be executed first. Like the influence determination system 12, the influence determination system 13 may repeat the operations each time a predetermined condition is satisfied.

[0078] The spatial resolution of displacement generally has a fairly wide range. For example, the spatial resolution of SAR is often at most a few meters. On the other hand, the spatial resolution of the surface state determined using sensor information is on the order of a few centimeters to a few tens of centimeters. The spatial resolution of the surface state is the smallest distance between two surface state determined using sensor information. The impact assessment system 13 then assesses the impact of an event based on the displacement and the surface state. Therefore, the impact assessment system 13 can achieve assessment with a higher spatial resolution than displacement.

[0079] Furthermore, in general, the observation period that forms the basis for analyzing displacement is often longer than the measurement period of the sensor information used to determine the surface layer condition. In other words, the measurement time of the sensor information used for the determination is often closer to the displacement than the observation time used for the determination, on average. Therefore, by using the surface layer condition, the influence determination system 13 can realize determination using information that is closer in time to the displacement, on average.

[0080] However, the sensor information measuring device 20 measures sensor information within the range in which the mobile object on which it is mounted can move. For example, if the sensor information measuring device 20 is a drive recorder mounted on a vehicle, the sensor information will be an image of the road on which the vehicle can travel. In other words, the surface state will be the state of the road. On the other hand, if the earth surface observation system 30 uses SAR mounted on an artificial satellite, the displacement will be a displacement that includes parts other than the road. In this way, the range of displacement will generally be wider than the range of the surface state.

[0081] For example, in the case of tunnel construction under a road, the impact of the tunnel construction may extend beyond the road above the tunnel construction to the surrounding area of ​​the road. However, a drive recorder cannot measure sensor information outside the road. On the other hand, SAR can observe the area surrounding the road. Therefore, the impact assessment system 13 can more accurately assess the impact of tunnel construction on the road by using, for example, the surface condition and displacement of the road above the tunnel construction, as well as the displacement around the road. As a result, the impact assessment system 13 can more appropriately assess the impact of an event. In this way, displacement and surface condition have different advantages. Therefore, the impact assessment system 13 uses both displacement and surface condition to more appropriately assess the impact of an event.

[0082] Similar to the influence assessment systems 11 and 12, the influence assessment system 13 may use at least one of velocity, which is the rate of change of displacement, and acceleration, which is the rate of change of the velocity of displacement, in addition to or instead of displacement. Furthermore, the influence assessment system 13 may use velocity, which is the rate of change of the surface layer condition, or acceleration, which is the rate of change of the velocity of the surface layer condition, in addition to or instead of the surface layer condition. For example, if the surface layer condition is deterioration, the velocity of the surface layer condition is the rate at which the deterioration of the surface layer progresses. For example, if cracks are used as the surface layer condition, the rate of change of the surface layer condition is the speed at which the crack rate increases or the speed at which the crack area expands. Furthermore, the velocity of the surface layer condition and the acceleration of the surface layer condition can be calculated based on accumulated data.

[0083] (3) Display device 40 The display device 40 displays the assessment results, as in the second embodiment. Furthermore, the display device 40 may display at least one of the sensor information and the surface layer condition in addition to the assessment results from the influence assessment system 13. FIG. 8 is a diagram illustrating an example of a display including the sensor information and the surface layer condition. In FIG. 8, the display device 40 displays the deterioration range and displacement range determined to be affected by the event on the left side. Furthermore, the display device 40 displays an image of the road and cracks as examples of the sensor information and the surface layer condition on the right side of FIG. 8. The upper right side shows the predicted cracks. The lower right side shows the cracks after the event. In FIG. 8, the display device 40 displays squares indicating the locations of the cracks. Referring to the upper and lower diagrams on the right side of FIG. 8, the two cracks surrounded by dashed ellipses in the lower right side of FIG. 8 are unexpected cracks. In other words, these cracks are estimated to have occurred due to the impact of tunnel construction.

[0084] <Hardware configuration> Next, the hardware configuration of the impact determination systems 11, 12, and 13 will be described using the impact determination system 13. Each component of the impact determination system 13 may be configured using a hardware circuit. Alternatively, each component of the impact determination system 13 may be configured using multiple devices connected via a network. For example, the impact determination system 13 may be configured using cloud computing. Alternatively, multiple components of the impact determination system 13 may be configured using a single piece of hardware.

[0085] The impact determination system 13 may be realized as a computer device including a central processing unit (CPU), read only memory (ROM), and random access memory (RAM). In addition to the above configuration, the impact determination system 13 may also be realized as a computer device including other components such as a network interface card (NIC).

[0086] FIG. 9 is a block diagram showing an example of the hardware configuration of a computer device 600 constituting the influence determination system 13. The computer device 600 includes a CPU 610, a ROM 620, a RAM 630, a storage device 640, and a NIC 650. The CPU 610 loads a program from at least one of the ROM 620 and the storage device 640. The CPU 610 then controls the RAM 630, the storage device 640, and the NIC 650 based on the loaded program. The computer device 600 including the CPU 610 controls these components and realizes the functions of a predicted displacement acquisition unit 150, a displacement acquisition unit 160, a displacement storage unit 165, and an influence determination unit 183 of the influence determination system 13. Furthermore, the computer device 600 realizes the functions of a sensor information acquisition unit 120, a predicted state acquisition unit 110, a sensor information storage unit 125, and a state determination unit 130.

[0087] When realizing each function, the CPU 610 may use at least one of the RAM 630 and the storage device 640 as a temporary storage medium for programs and data. The CPU 610 may also read, using a storage medium reading device (not shown), a program contained in a storage medium 690 that stores a computer-readable program. Alternatively, the CPU 610 may obtain a program from another device (not shown) via the NIC 650, store the obtained program in at least one of the RAM 630 and the storage device 640, and operate based on the stored program.

[0088] The ROM 620 stores programs executed by the CPU 610 and fixed data. The ROM 620 is, for example, a programmable ROM (P-ROM) or a flash ROM. The RAM 630 temporarily stores at least one of the programs and data executed by the CPU 610. The RAM 630 is, for example, a dynamic RAM (D-RAM). The storage device 640 stores data and programs that the computer device 600 stores long-term. The storage device 640 realizes the functions of the sensor information storage unit 125 and the displacement storage unit 165. The storage device 640 may also operate as a temporary storage device for the CPU 610. The storage device 640 is, for example, a hard disk device, a magneto-optical disk device, a solid-state drive (SSD), or a disk array device.

[0089] The ROM 620 and the storage device 640 are non-volatile (non-transitory) recording media. On the other hand, the RAM 630 is a volatile (transitory) recording media. The CPU 610 can operate based on a program stored in at least one of the ROM 620, the storage device 640, and the RAM 630. In other words, the CPU 610 can operate using at least one of a non-volatile recording medium and a volatile recording medium.

[0090] The NIC 650 relays data exchange with other devices (not shown) via a network. The NIC 650 is, for example, a local area network (LAN) card. Furthermore, the NIC 650 is not limited to being wired, and may be wireless. In the computer device 600 configured in this manner, the CPU 610 realizes functions similar to those of the influence determination systems 11, 12, or 13 based on a program.

[0091] <Examples of use of the impact assessment system> To explain the impact determination system 13, a specific example of a system that uses the impact determination system 13 will be described with reference to the drawings. FIG. 10 is a conceptual diagram of the entire system. Note that in FIG. 10, the main components of each configuration may be the same or different. In FIG. 10, a computer device 810 is an example of the impact determination system 13. A drive recorder 820 is an example of a sensor information measuring device 20. An SAR system 830, which includes an artificial satellite equipped with a SAR and a ground station, is an example of an earth surface observation system 30. A terminal device 840 is an example of a display device 40. A vehicle 850 is an example of a moving body. Note that in FIG. 10, the drive recorder 820 is mounted outside the vehicle 850. However, the drive recorder 820 may also be mounted inside the vehicle 850.

[0092] Network 880 is a communication path that interconnects the devices and systems. For example, network 880 may be the Internet, a public telephone line, a dedicated communication network, or a combination thereof. However, network 880 is not limited to the above and may be any communication path that can connect the devices and systems. Network 880 may be configured using multiple networks rather than a single network. For example, network 880 may be configured using different networks to connect computer device 810 (described below) to other devices or systems. Connection between the computer device 810 and the drive recorder 820 Connection between the computer device 810 and the SAR system 830 Connection between the computer device 810 and the terminal device 840 Alternatively, when multiple drive recorders 820 are included, network 880 may be configured using multiple networks corresponding to the locations of drive recorders 820 as connections between computer device 810 and drive recorders 820 .

[0093] As such, the number of components included in FIG. 10 is an example and is not limited to the number shown in FIG. 10. For example, the number of drive recorders 820 is not limited to three, but may be one, two, or four or more. Furthermore, the components shown in FIG. 10 can be replaced with other devices or systems. For example, drive recorder 820 may be mounted on a moving object other than vehicle 850, such as a drone. Alternatively, drive recorder 820 may be replaced with a fixed camera.

[0094] The vehicle 850 is equipped with a drive recorder 820 and travels on structures such as roads and bridges. The vehicle 850 may travel through structures such as tunnels. The drive recorder 820 measures sensor information of structures such as roads and bridges on which the vehicle 850 travels and outputs the measured sensor information to the computer device 810. For example, the drive recorder 820 measures images and acceleration as sensor information and outputs the information to the computer device 810. The SAR system 830 outputs observation results of the ground surface to the computer device 810. Alternatively, the SAR system 830 analyzes the observation results and outputs the displacement of the ground surface including the structure.

[0095] The computer device 810 acquires pre-event sensor information from the driving recorder 820 and stores the pre-event sensor information. The computer device 810 then acquires a predicted surface condition based on the pre-event sensor information. The computer device 810 also acquires post-event sensor information from the driving recorder 820. The computer device 810 then determines a post-event surface condition based on the post-event sensor information. The computer device 810 then acquires pre-event observation results from the SAR system 830 and analyzes the acquired observation results to acquire and store pre-event displacements. Alternatively, the computer device 810 acquires and stores pre-event displacements from the SAR system 830. That is, the computer device 810 stores pre-event displacements that are the result of analysis using pre-event observations in the SAR system 830. The computer device then acquires predicted displacements based on the pre-event displacements. The computer device 810 also acquires post-event displacements from the SAR system 830. The computer device 810 then determines the impact of the event on the structure based on the predicted surface state, post-event surface state, predicted displacement, and post-event displacement. The computer device 810 then outputs the determination result to the terminal device 840. The terminal device 840 displays the determination result obtained from the computer device 810.

[0096] Generally available products and systems can be applied as the computer device 810, the drive recorder 820, the SAR system 830, the terminal device 840, and the vehicle 850. For example, a general personal computer may be used as the computer device 810. As such, there are no particular limitations on the devices and systems used as the computer device 810, the drive recorder 820, the SAR system 830, the terminal device 840, and the vehicle 850.

[0097] A part or all of the above-described embodiments can be described as, but not limited to, the following supplementary notes.

[0098] (Appendix 1) a predicted displacement acquisition means for acquiring a predicted displacement of the structure after an event, the predicted displacement being a displacement of the structure on the ground surface, the predicted displacement being predicted based on a pre-event displacement acquired before the event related to the ground of the structure; a displacement acquisition means for acquiring post-event displacement of the structure based on observation results of the ground surface observed after the event; an impact determination means for determining the impact of an event on a structure based on the predicted displacement and the post-event displacement; Impact assessment system including.

[0099] (Appendix 2) The predicted displacement acquisition means acquires a predicted displacement based on the pre-event displacement. 1. An impact determination system as described in Appendix 1.

[0100] (Appendix 3) The predicted displacement acquisition means acquires predicted displacements at a plurality of times after the event, the displacement acquisition means acquires post-event displacements at each of a plurality of times after the event; The influence determination means determines the influence of the event based on the predicted displacement and the post-event displacement at each of a plurality of times after the event. 1. An impact determination system according to claim 1 or 2.

[0101] (Appendix 4) the displacement acquisition means acquires a pre-event displacement and a post-event displacement at each of the plurality of positions; The predicted displacement acquisition means acquires a predicted displacement at each of the plurality of positions based on the pre-event displacement at each of the plurality of positions; The influence determination means determines the influence of the event based on the predicted displacement and the post-event displacement at each of the plurality of positions. An effect assessment system according to any one of appendices 1 to 3.

[0102] (Appendix 5) The displacement acquisition means adds the acquired post-event displacement to the pre-event displacement; The predicted displacement acquisition means uses the pre-event displacement to which the post-event displacement has been added in acquiring the next predicted displacement. An effect assessment system according to any one of appendices 1 to 4.

[0103] (Appendix 6) a predicted state acquisition means for acquiring a predicted surface state of the structure after the event, the predicted surface state being sensor information related to the surface of the structure, the sensor information being measured before the event; a sensor information acquisition means for acquiring post-event sensor information measured after an event; a state determination means for determining the post-event surface state of the structure based on post-event sensor information; further comprising The impact determination means determines the impact of the event on the structure based on the predicted surface state and the post-event surface state. An effect assessment system according to any one of appendices 1 to 5.

[0104] (Appendix 7) The predicted state acquisition means acquires a predicted surface state based on the pre-event sensor information. 1. An impact determination system as described in Appendix 6.

[0105] (Appendix 8) The event is at least one of construction beneath the structure, construction around the structure, construction on the ground, an accident, and a disaster. An effect assessment system according to any one of appendices 1 to 7.

[0106] (Appendix 9) The influence determination means further obtains a predicted displacement based on at least one of the strata of the ground of the structure, the area where the event is occurring, the topography, geology, soil, weather, type of construction work, and construction method of the structure. An effect assessment system according to any one of appendices 1 to 8.

[0107] (Appendix 10) The displacement acquisition means acquires post-event displacement based on the observation results of a ground observation system including a synthetic aperture radar that observes the ground surface including the structure. An effect assessment system according to any one of appendices 1 to 9.

[0108] (Appendix 11) The sensor information acquisition means acquires post-event sensor information from a sensor information measurement device mounted on the moving body. 10. An impact determination system as described in Appendix 6 or 7.

[0109] (Appendix 12) The moving body is a vehicle, the sensor information measuring device is a drive recorder, The sensor information is an image of the surface of the structure. 12. An impact determination system as described in Appendix 11.

[0110] (Appendix 13) obtaining a predicted displacement of the structure after the event, the predicted displacement being a displacement of the structure at the ground level, predicted based on a pre-event displacement obtained before the event associated with the ground of the structure; Obtaining post-event displacements of the structure based on surface observations taken after the event; Determine the impact of the event on the structure based on predicted displacement and post-event displacement Impact determination method.

[0111] (Appendix 14) obtaining a predicted displacement of the structure after the event, the predicted displacement being a displacement of the structure at the surface of the earth, the predicted displacement being based on a pre-event displacement obtained before the event related to the ground of the structure; obtaining post-event displacements of the structure based on surface observations observed after the event; determining the impact of the event on the structure based on the predicted displacement and the post-event displacement; A recording medium that records a program that causes a computer to execute the above.

[0112] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. [Explanation of symbols]

[0113] 11 Impact Assessment System 12 Impact Assessment System 13 Impact Assessment System 20 Sensor information measuring device 30 Surface Observation System 40 Display device 110 Predicted state acquisition unit 120 Sensor information acquisition unit 125 Sensor information storage unit 130 Status determination unit 150 Predicted displacement acquisition unit 160 Displacement acquisition unit 165 Displacement Conservation Section 180 Impact Determination Department 183 Impact Determination Department 600 Computer equipment 610 CPU 620 ROM 630 RAM 640 Storage device 650 NIC 810 Computer equipment 820 Drive Recorder 830 SAR System 840 Terminal Equipment 850 vehicles 880 Network

Claims

1. a predicted displacement acquisition means for acquiring a predicted displacement of a structure on the ground surface after an event, the predicted displacement being predicted based on a pre-event displacement acquired before the event related to the ground of the structure; a displacement acquisition means for acquiring a post-event displacement of the structure based on observation results of the ground surface observed after the event; an effect determination means for determining an effect of the event on the structure based on the predicted displacement and the post-event displacement; Impact assessment system including.

2. The predicted displacement acquisition means acquires the predicted displacement based on the pre-event displacement. The influence determination system according to claim 1 .

3. the predicted displacement acquisition means acquires the predicted displacement at each of a plurality of times after the event, the displacement acquisition means acquires the post-event displacement at each of the plurality of times after the event, The influence determination means determines the influence of the event based on the predicted displacement and the post-event displacement at each of the plurality of times after the event. The influence determination system according to claim 1 or 2.

4. the displacement acquisition means acquires the pre-event displacement and the post-event displacement at each of a plurality of positions; the predicted displacement acquisition means acquires the predicted displacement at each of the plurality of positions based on the pre-event displacement at each of the plurality of positions; The influence determination means determines the influence of the event based on the predicted displacement and the post-event displacement at each of the plurality of positions. The influence determination system according to any one of claims 1 to 3.

5. the displacement acquisition means adds the acquired post-event displacement to the stored pre-event displacement; The predicted displacement acquisition means uses the pre-event displacement to which the post-event displacement has been added in acquiring the next predicted displacement. The influence determination system according to any one of claims 1 to 4.

6. a predicted state acquisition means for acquiring a predicted surface state of the structure after the event, the predicted surface state being sensor information related to the surface of the structure, the sensor information being measured before the event; a sensor information acquisition means for acquiring post-event sensor information measured after the event; a state determination means for determining a post-event surface state of the structure based on the post-event sensor information; further comprising The impact determination means determines the impact of the event on the structure based on the predicted surface state and the post-event surface state. The influence determination system according to any one of claims 1 to 5.

7. The predicted state acquisition means acquires the predicted surface state based on the pre-event sensor information. The influence determination system according to claim 6 .

8. The event is at least one of construction work under the structure, construction work around the structure, construction work on the ground, an accident, and a disaster. The influence determination system according to any one of claims 1 to 7.

9. obtaining a displacement of a structure at the surface of the earth, the predicted displacement of the structure after the event being predicted based on pre-event displacements obtained before the event related to the ground of the structure; obtaining a post-event displacement of the structure based on observations of the ground surface observed after the event; determining an impact of the event on the structure based on the predicted displacement and the post-event displacement; Impact determination method.

10. obtaining a predicted displacement of a structure on the surface of the earth after the event, the predicted displacement being predicted based on pre-event displacements obtained before the event related to the ground of the structure; obtaining a post-event displacement of the structure based on observations of the ground surface observed after the event; determining an impact of the event on the structure based on the predicted displacement and the post-event displacement; A program that causes a computer to execute the following.

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