Estimation device, estimation method, and program

Abstract

Provided is an estimation device or the like capable of improving the accuracy of estimation of change, even when there is a variation that is of a change in measurement value and that depends on a target region. This estimation method according to one aspect of the present disclosure includes: determining a selection condition on the basis of geospatial information about a target point among a plurality of measurement points at which transitions of heights have been measured by a synthetic aperture radar; and estimating an estimation value of a change in height at the target point on the basis of a measurement value of a transition of heights at the target point and a measurement value of a transition of heights at a measurement point that satisfies the selection condition.

Description

[Technical field]

[0001] The present disclosure relates to a technique for estimating an estimated value from measurement results in which noise components have been removed, and in particular to a technique for estimating an estimated value from results measured by a synthetic aperture radar. [Background technology]

[0002] Measurements taken by sensors, such as the variations in ground level as measured by a synthetic aperture radar, are generally noisy.

[0003] One technique for obtaining an estimated value with noise removed from the measurement results is disclosed in Patent Document 1. The technique in Patent Document 1 describes a device that averages the signals of pixels at the same position in image signals obtained by multiple infrared imaging elements arranged to obtain the same image.

[0004] Patent Document 2 discloses a method for removing noise from three-dimensional point cloud data, which is a set of points whose three-dimensional coordinates are obtained as a result of measurement by a laser scanning device that measures the distance to a measurement point that reflects laser light. The method divides a curved surface formed by measurement points corresponding to a two-dimensional rectangular area set for the three-dimensional point cloud data into a set of triangles with the measurement points as vertices. The method finds a composite normal vector that combines the normal vectors of all the triangles into one. Then, the method treats one of the measurement points as noise if the standard deviation of the measurement values ​​in the coordinate axis direction when the coordinates are converted so that the composite normal vector coincides with the coordinate axis exceeds a predetermined value. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-233390 [Patent Document 2] JP 2005-024370 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the technology of Patent Document 1, signals of pixels at the same position of multiple images captured by multiple sensors at the same time are averaged. In addition, the technology of Patent Document 2 is a technology for identifying noise at multiple measurement points where distances are measured at the same timing. In the technology of Patent Document 2, when the measurement value of a specific measurement point contains noise, it is not possible to estimate the three-dimensional coordinate of the measurement point. Furthermore, in the technologies of Patent Documents 1 and 2, it is not possible to estimate changes in measurement values, etc. Therefore, the technologies of Patent Documents 1 and 2 cannot be applied to, for example, estimation of the height of the earth's surface. In the technologies of Patent Documents 1 and 2, when the change in the measurement value of the target varies depending on the difference in the properties of the area to be measured, it is not possible to accurately estimate the change in the measurement value.

[0007] An object of the present disclosure is to provide an estimation device etc. that can improve the accuracy of estimating a change even when the change in the measurement value varies depending on the region of the target. [Means for solving the problem]

[0008] An estimation device according to one aspect of the present disclosure includes a determination means for determining a selection condition based on geospatial information of a target point among a plurality of measurement points at which the change in ground surface height is measured by a synthetic aperture radar, and an estimation means for estimating an estimated value of a change in ground surface height at the target point based on a measured value of the change in ground surface height at the target point and a measured value of the change in ground surface height at the measurement point that satisfies the selection condition.

[0009] An estimation method according to one aspect of the present disclosure determines a selection condition based on geospatial information of a target point among a plurality of measurement points at which the change in ground surface height is measured by a synthetic aperture radar, and estimates an estimate of the change in ground surface height at the target point based on the measured value of the change in ground surface height at the target point and the measured value of the change in ground surface height at the measurement point that satisfies the selection condition.

[0010] A storage medium according to an aspect of the present disclosure stores a program that causes a computer to execute a determination process for determining a selection condition based on geospatial information of a target point among a plurality of measurement points at which a change in the height of the ground surface is measured by a synthetic aperture radar, and an estimation process for estimating an estimated value of a change in the height of the ground surface at the target point based on a measurement value of the change in the height of the ground surface at the target point and a measurement value of the change in the height of the ground surface at the measurement point that satisfies the selection condition. One aspect of the present disclosure is also realized by the above-mentioned program. Effect of the Invention

[0011] The present disclosure has an advantage in that it is possible to improve the accuracy of estimating a change even when the change in the measurement value varies depending on the region of interest. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a block diagram illustrating an example of a configuration of an estimation system according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a flowchart illustrating an example of the operation of the estimation device according to the first embodiment of the present disclosure. [Diagram 3] FIG. 3 is a block diagram illustrating an example of a configuration of an estimation system according to a second embodiment of the present disclosure. [Figure 4] FIG. 4 is a flowchart illustrating an example of the operation of the estimation device according to the second embodiment of the present disclosure. [Diagram 5] FIG. 5 is a block diagram illustrating an example of a configuration of an estimation device according to a third embodiment of the present disclosure. [Figure 6] FIG. 6 is a flowchart illustrating an example of the operation of the estimation device according to the third embodiment of the present disclosure. [Figure 7] FIG. 7 is a block diagram illustrating an example of a configuration of a computer capable of realizing an apparatus such as an estimation apparatus according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Next, an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0014] <First embodiment> <<Configuration>> 1 is a block diagram illustrating an example of a configuration of an estimation system 1 according to a first embodiment of the present disclosure. In the example illustrated in FIG. 1, the estimation system 1 includes an estimation device 100, a measurement data storage device 200, a geospatial information storage device 300, and an output destination device 400.

[0015] The estimation device 100 includes a determination unit 110, an estimation unit 120, an output unit 140, a measurement data acquisition unit 150, and a geospatial information acquisition unit 160. The measurement data storage device 200 includes a measurement data storage unit 210 and a first input / output unit 220. The geospatial information storage device 300 includes a geospatial information storage unit 310 and a second input / output unit 320.

[0016] The determination unit 110 of the estimation device 100 determines the selection condition based on the geospatial information stored in the geospatial information storage device 300 for a target point among a plurality of measurement points where the change in the height of the ground surface is measured by a synthetic aperture radar. The geospatial information is, for example, information that represents at least one of the state of the ground surface and the state of the underground of the ground surface. The geospatial information is, for example, related to the geology of the measurement point and the presence or absence of buildings. The estimation unit 120 estimates an estimated value of the change in the height of the ground surface at the target point based on the measured value of the change in the height of the ground surface at the target point and the measured value of the change in the height of the ground surface at the measurement point that satisfies the selection condition. Therefore, even if the change in the measured value of the target varies depending on the difference in the geology of the area to be measured and the presence or absence of buildings, the change in the measured value can be estimated with high accuracy.

[0017] The measured values ​​of the change in ground surface height at the measurement point are stored as measurement data in the measurement data storage device 200. The output unit 140 outputs to the output destination device 400 an estimate of the change in ground surface height at the target point.

[0018] The details will be explained below.

[0019] <<Measurement Data Storage Unit 210>> The measurement data storage unit 210 stores the measurement data.

[0020] The measurement data is data representing a transition of the results of measuring the height of the ground surface at multiple points by a synthetic aperture radar (hereinafter, referred to as a transition of the height of the ground surface). The height of the ground surface may be the height of the ground surface from a predetermined reference plane. The height of the ground surface in the measurement data is the height at multiple measurement points on the ground surface obtained by observation using, for example, a radar mounted on a flying object such as an artificial satellite or an aircraft as a synthetic aperture radar (SAR). In the following description, such observation is referred to as observation by a synthetic aperture radar. The data representing the transition of the height of the ground surface may be data including, for example, multiple combinations of a value representing the height and data representing the time when the height was obtained by observation. The unit of the data representing the time may be determined appropriately. For example, the data representing the time may represent a date, or may represent a date and a time. The unit of the time may also be determined appropriately.

[0021] A point on the earth's surface where the change in the height of the earth's surface is obtained is referred to as a measurement point. The measurement data may include a combination of position data representing the position of each of a plurality of measurement points and data representing the change in the height of the earth's surface at the measurement points. Information representing the position of a point on the earth's surface (i.e., a measurement point) may be, for example, information of latitude and longitude. Information representing the position may be other information capable of identifying a position on the earth's surface. Hereinafter, information representing the position of a point will be referred to as point information.

[0022] Data representing the transition of the height of the ground surface at a measurement point on the ground surface will be referred to as height transition data hereinafter. The height transition data included in the measurement data is data that has not been subjected to noise removal or the like. The height transition data of the measurement data includes noise and the like.

[0023] In other words, in the measurement data, the height transition data may be associated with point information of the measurement points where the height transition represented by the height transition data was measured. In other words, the measurement data includes point information of a plurality of measurement points and height transition data at each of the plurality of measurement points.

[0024] <<First input / output section 220>> The first input / output unit 220 reads out the measurement data stored in the measurement data storage unit 210 and supplies it to the estimation device 100. The first input / output unit 220 may receive, for example, a request for measurement data from the estimation device 100. The request for measurement data may include information specifying a range on the earth's surface. The first input / output unit 220 may read out the measurement data of the measurement point included in the received request from the measurement data storage unit 210 and supply the read measurement data to the estimation device 100.

[0025] <<Geospatial information storage unit 310>> The geospatial information storage unit 310 stores geospatial information.

[0026] As described above, in this embodiment, the geospatial information is, for example, information that represents at least one of the state of the earth's surface and the state of the underground of the earth's surface. The geospatial information may be at least one of information obtained from a so-called geographic information system. The geospatial information may be data obtained by observation from an artificial satellite, an aircraft, or the like. The geospatial information may be data obtained by a field survey. The geospatial information may be information that represents the results of an analysis based on data obtained by measurement or survey. The geospatial information may be information that is artificially determined based on data obtained by measurement or survey. The geospatial information is sometimes written as GIS (Geographic Information System) data.

[0027] The geospatial information may be acquired in advance from a geographic information system and stored in the geospatial information storage unit 310. A plurality of types of geospatial information may be stored in the geospatial information storage unit 310. The geospatial information may be expressed in a format that can identify the value of the geospatial information of a point identified by point information (e.g., latitude and longitude). Specific examples of geospatial information will be described in detail later.

[0028] <<Second input / output section 320>> The second input / output unit 320 extracts values ​​of geospatial information from the geospatial information stored in the geospatial information storage unit 310, and supplies the extracted values ​​of geospatial information to the estimation device 100. The second input / output unit 320 may receive, for example, a request for a value of geospatial information including point information from the estimation device 100. The second input / output unit 320 may extract values ​​of geospatial information of a point identified by the point information of the received request from the geospatial information stored in the geospatial information storage unit 310. The request for the value of geospatial information may include point information of a plurality of points. The second input / output unit 320 may extract values ​​of geospatial information of a point identified by the point information of the plurality of points included in the request for the value of geospatial information from the geospatial information stored in the geospatial information storage unit 310. The second input / output unit 320 may supply the extracted values ​​of geospatial information of the plurality of points to the estimation device 100.

[0029] The second input / output unit 320 may extract values ​​of a predetermined type of geospatial information at a point specified by the point information. The second input / output unit 320 may extract values ​​of all types of geospatial information stored in the geospatial information storage unit 310 at a point specified by the point information. When there is geospatial information in which a value does not exist at a point specified by the point information, the second input / output unit 320 may not extract a value of the geospatial information. When there is geospatial information in which a value does not exist at a point specified by the point information, the second input / output unit 320 may set the value of the geospatial information to a value representing the absence of a value (e.g., 0, etc.).

[0030] <<Details of geospatial information>> The geospatial information may be expressed, for example, by a value representing the state of each mesh into which the earth's surface is divided. In this case, the second input / output unit 320 extracts the value of the geospatial information representing the state in the mesh that includes the position specified by the point information as the value of the geospatial information of the point specified by the point information. The size and shape of the mesh may be determined for each type of geospatial information.

[0031] The geospatial information may be expressed in other formats. For example, the geospatial information may be expressed by a boundary line between areas with different states and a value representing a state within the area separated by the boundary line. In this case, the second input / output unit 320 extracts a value representing a state within an area including a position specified by the point information as a value of the geospatial information of the point specified by the point information. The format of the geospatial information may be determined for each type of geospatial information.

[0032] Specific geospatial information may be, for example, the type of embankment, the average slope angle, the average precipitation (e.g., the average annual precipitation), the surface geology, the designation of steep slopes, the designation of landslide hazard areas, the risk of liquefaction, the possibility of installing rainwater infiltration basins, the susceptibility to shaking during earthquakes, lowlands with difficult drainage, urban land use, natural terrain classification, artificial terrain classification, the surface geology, the riverbed, and facility information (whether or not construction is taking place, etc.). The geospatial information of this embodiment is not necessarily limited to these examples. The geospatial information of this embodiment may not include some of these examples.

[0033] The type of embankment may represent the way the earth is piled up, which is determined by the shape of the ground surface on which the embankment is built. For example, the type of embankment may be a "valley filling embankment" in which a valley or stream is filled with earth, or a "belly-filling embankment" in which an embankment is built on a slope.

[0034] The type of embankment may further represent the scale of the embankment. In this case, for example, among embankments filled in valleys or streams, the type of embankment that meets the criteria (e.g., embankments with an area of ​​3000 square meters or more) may be a "large-scale valley-filling embankment." In this case, among embankments filled in valleys or streams, the type of embankment that does not meet the criteria may be a "valley-filling embankment." Also, among embankments built on sloping land, the type of embankment that meets the criteria (e.g., embankments whose angle with the horizontal plane of the ground surface (also called the original ground surface) before the embankment is 20 degrees or more and whose height is 5 meters or more) may be a large-scale belly-type embankment. In this case, among embankments built on sloping land, the type of embankment that does not meet the criteria may be a "belly-type embankment."

[0035] The value of the type of embankment construction may be any one of different numerical values ​​appropriately assigned in advance to, for example, "valley filling embankment" or "belt-type embankment," etc.

[0036] The average inclination angle may be data of an average inclination angle of the ground surface calculated on a mesh-by-mesh basis, and the value of the average inclination angle may be the calculated average inclination angle of the ground surface.

[0037] The average precipitation may be data of an average precipitation amount on the ground surface calculated on a mesh basis, for example. The value of the average precipitation may be the calculated average precipitation amount on the ground surface.

[0038] The surface geology may be data representing the geology of the surface layer of the earth's surface (in other words, the type of geology). The type of geology may be determined in advance. Each type of geology may be assigned a different numerical value in advance. The value of the surface geology may be any one of the numerical values ​​appropriately assigned to each geology in advance.

[0039] The steep slope designation may be data indicating whether or not the area is designated as a steep slope by a local government, etc. The steep slope designation value may be, for example, a numerical value indicating that the area is designated as a steep slope, or a numerical value indicating that the area is not designated as a steep slope. These numerical values ​​may be different from each other and may be appropriately determined in advance.

[0040] The landslide disaster warning area designation may represent whether or not the area has been designated as a landslide disaster warning area by, for example, a local government. The value of the landslide disaster warning area designation may be, for example, a numerical value representing that the area has been designated as a landslide disaster warning area, or a numerical value representing that the area has not been designated as a landslide disaster warning area. These numerical values ​​may be different from each other and may be determined in advance.

[0041] The liquefaction risk may be, for example, data representing the degree of risk of land liquefaction. The liquefaction risk value may be a numerical value representing the degree of risk of land liquefaction. The liquefaction risk value may be one of a number of different numerical values ​​each representing a different degree. The numerical value representing the degree of risk may be determined as appropriate in advance.

[0042] The possibility of installing a rainwater infiltration basin may be information indicating whether or not the basin can be installed based on, for example, an "infiltration facility installation judgment map" that indicates the result of judging whether or not the infiltration facility can be installed based on the topography, soil quality, and groundwater level. The value of the possibility of installing a rainwater infiltration basin may be a numerical value indicating that the basin can be installed, or a numerical value indicating that the basin cannot be installed. As these numerical values, numerical values ​​different from each other may be appropriately determined in advance.

[0043] The shaking susceptibility during an earthquake may be, for example, data representing the degree of shaking susceptibility of the ground surface when an earthquake occurs. The value of the shaking susceptibility during an earthquake may be a numerical value representing the degree of shaking susceptibility of the ground surface when an earthquake occurs. The value of the shaking susceptibility during an earthquake may be any one of a plurality of numerical values ​​representing the degree of shaking susceptibility of the ground surface when an earthquake occurs. The numerical value representing the degree of shaking susceptibility of the ground surface may be appropriately determined in advance.

[0044] The lowland with drainage difficulties may indicate whether the land is lowland with drainage difficulties, estimated based on the land's altitude or the difference in altitude from the surrounding area. The value of the lowland with drainage difficulties may be a numerical value indicating that the land is lowland with drainage difficulties, or a numerical value indicating that the land is not lowland with drainage difficulties. These numerical values ​​may be determined appropriately in advance.

[0045] The urban land use may be a type of land use in an area designated as a city. The land use type in the urban land use may be interpreted, for example, from a satellite photograph. A land use type selected from a plurality of predetermined types may be set for an area included in the urban area. A different numerical value may be assigned to each of the plurality of predetermined types as appropriate in advance. The value of the land use type set for the area may be the numerical value assigned to that type.

[0046] The natural terrain classification may be, for example, a type of terrain in a place that is not a structure constructed by humans. A plurality of types of terrain that can be set as the natural terrain classification may be appropriately determined in advance. A type of terrain selected from a plurality of types of terrain that are predetermined as types that can be set as the natural terrain classification may be set for an area in which the natural terrain classification is set. A different numerical value may be assigned to each of the plurality of types. The value of the terrain in the natural terrain classification set for an area may be a numerical value assigned to the type of terrain set for that area.

[0047] The artificial terrain classification may be, for example, a type of terrain in a place where the terrain has been altered by humans or a place where a structure has been constructed by humans. A plurality of types of terrain that can be set as the artificial terrain classification may be appropriately determined in advance. A type of terrain selected from a plurality of types of terrain that are predetermined as types that can be set as the artificial terrain classification may be set for an area in which the artificial terrain classification is set. A different numerical value may be assigned to each of the plurality of types. The value of the terrain in the artificial terrain classification set for an area may be a numerical value assigned to the type of terrain set for that area.

[0048] The surface geology may represent, for example, the type of soil on the earth's surface. A plurality of soil types may be determined as appropriate in advance. Different numerical values ​​determined as appropriate in advance may be assigned to each of the plurality of soil types. For example, a soil type based on the results of an investigation may be set for an area. The value of the surface geology of an area may be the numerical value assigned to the soil type set for that area.

[0049] The specific geospatial information may be building information. The building information may represent, for example, the range of each building. The value of the building information may be, for example, a different identification number assigned to each building. The value of the building information for a point not included in the range of the building may be a value (e.g., 0, etc.) that represents a non-building.

[0050] <<Measurement data acquisition unit 150>> The measurement data acquisition unit 150 acquires measurement data from the measurement data storage device 200. The measurement data acquisition unit 150 may, for example, transmit a request for measurement data of a specified range (hereinafter referred to as the specified range) to the measurement data storage device 200. The specified range may be determined in advance. The specified range may be specified by a user of the estimation device 100, for example, by an input unit such as a keyboard or mouse of the estimation device 100. The input unit is omitted in FIG. 1. The measurement data acquisition unit 150 receives measurement data at measurement points in the specified range from the measurement data storage device 200.

[0051] The measurement data acquisition unit 150 sends the received measurement data to the estimation unit 120.

[0052] <<Estimation section 120>> The estimation unit 120 receives the measurement data of the specified region from the measurement data acquisition unit 150 .

[0053] The estimation unit 120 selects, as a target point, one measurement point from among the measurement points for which height transition data has been obtained by measurement in the received measurement data.

[0054] The estimation unit 120 sends the point information of the target point to the determination unit 110. The determination unit 110 will be described in detail later. The estimation unit 120 receives a selection condition for selecting a measurement point, which is determined based on the point information of the target point, from the determination unit 110. In other words, the estimation unit 120 receives information representing the determined selection condition from the determination unit 110. The selection condition is determined by the determination unit 110. The selection condition is determined, for example, such that the target point satisfies the selection condition. The selection condition is further determined based on a value of geospatial information at the target point. The type of geospatial information associated with the value of the geospatial information may be determined in advance.

[0055] The estimation unit 120 sends the value of the geospatial information to the determination unit 110 to cause the determination unit 110 to determine the selection condition. In this case, the estimation unit 120 acquires the value of the geospatial information at each of the measurement points included in the target range from the geospatial information storage device 300 via the geospatial information acquisition unit 160. The estimation unit 120 transmits a request for geospatial information, in which, for example, information specifying the type of geospatial information and the point information of the measurement point are specified, to the geospatial information storage device 300 via the geospatial information acquisition unit 160. In other words, the estimation unit 120 transmits a request for geospatial information, including information specifying the type of geospatial information and the point information of the measurement point, to the geospatial information storage device 300 via the geospatial information acquisition unit 160. The estimation unit 120 receives the value of the geospatial information at the measurement point from the geospatial information storage device 300 via the geospatial information acquisition unit 160. Specifically, the estimation unit 120 may send a request for geospatial information to the geospatial information acquisition unit 160. The geospatial information acquisition unit 160 receives the request for geospatial information and transmits the received request for geospatial information to the geospatial information storage device 300. The geospatial information acquisition unit 160 receives a value of the geospatial information from the geospatial information storage device 300 and sends the received value of the geospatial information to the estimation unit 120. The estimation unit 120 receives the value of the geospatial information from the geospatial information acquisition unit 160 and outputs it to the determination unit 110.

[0056] The estimation unit 120 may send the value of the geospatial information of the target point together with the point information of the target point to the determination unit 110. The determination unit 110 may receive the point information of the target point and the value of the geospatial information of the target point from the estimation unit 120.

[0057] In addition, instead of the estimation unit 120 sending the value of the geospatial information to the determination unit 110, the determination unit 110 may acquire the value of the geospatial information at the location indicated by the received geospatial information of the target location from the geospatial information storage device 300 via the geospatial information acquisition unit 160.

[0058] Specifically, the determining unit 110 transmits a request for geospatial information, in which information specifying the type of geospatial information and point information of the target point are specified, to the geospatial information acquiring unit 160. In other words, the determining unit 110 transmits a request for geospatial information, including information specifying the type of geospatial information and point information of the target point, to the geospatial information acquiring unit 160. Then, the geospatial information acquiring unit 160 transmits the received request for geospatial information to the geospatial information storage device 300. The geospatial information acquiring unit 160 receives a value of the geospatial information at the target point from the geospatial information storage device 300, and sends the received value of the geospatial information at the target point to the determining unit 110. Then, the determining unit 110 receives the value of the geospatial information at the target point from the geospatial information acquiring unit 160.

[0059] The determining unit 110 determines a selection condition based on a value of the geospatial information at the target point. The estimating unit 120 receives information representing the determined selection condition from the determining unit 110.

[0060] The selection conditions will be explained in detail later.

[0061] The estimation unit 120 selects a measurement point that satisfies a selection condition from the measurement points for which height transition data has been obtained in the received measurement data. The estimation unit 120 estimates estimated change transition data of the target point based on the height transition data of the selected measurement point and the height transition data of the target point. The estimated change transition data will be described in detail later. If the selection condition is determined such that the target point satisfies the selection condition, the target point is included in the selected measurement points. The estimation unit 120 estimates estimated change transition data of the target point based on the height transition data of the selected measurement point.

[0062] Next, the estimation of the estimated change transition data of the target point will be described in detail. The estimation unit 120 may first calculate the transition of the change in height at a plurality of measurement points from the height transition data at the plurality of measurement points included in the received measurement data.

[0063] The estimation unit 120 may calculate the change in the height of the ground surface at each time point when the height of the ground surface at the previous time point is obtained, from the height of the ground surface at the previous time point, as the transition of the change in the height of the ground surface at a certain measurement point. Hereinafter, the time point at which the measurement is performed is referred to as the measurement time point. In this case, the change in height at a certain measurement time point may be, for example, a value obtained by subtracting the height of the ground surface at the measurement time point immediately before the measurement time point from the height of the ground surface at the measurement time point. The estimation unit 120 may calculate the change in height at a certain measurement time point per predetermined period from the height of the ground surface at the measurement time point immediately before the measurement time point. The predetermined period may be appropriately determined. The predetermined period may be, for example, one month. The predetermined period may be, for example, one year. In this case, the estimation unit 120 may, for example, multiply the value obtained by subtracting the height of the ground surface at the measurement time point immediately before the measurement time point from the height of the ground surface at that measurement time point by a value representing a predetermined time interval, and further divide the value by a value representing the period from the measurement time point to the immediate time point immediately before the measurement time point. The estimation unit 120 may regard the obtained value as the change in height at a certain measurement time point. In the following description, the difference between the measurement values ​​of the ground surface height measured at two time points, or the change per predetermined time interval calculated from the difference, is also referred to as the measurement value of the change in height.

[0064] Hereinafter, data representing the transition of the change in height of the ground surface at a plurality of measurement points will be referred to as change data. Data representing the transition of the change in height of the ground surface at a certain measurement point will be referred to as change transition data. The change data includes height transition data of a plurality of measurement points.

[0065] The change transition data at a certain measurement point includes data representing a change in the height of the ground surface at each measurement time point at which a previous measurement time point exists for that measurement point. The change transition data may be a combination of data representing a measurement time point and data representing a change in the height of the ground surface at that measurement time point. The change data may include, for example, a combination of point information and change transition data for a plurality of measurement points.

[0066] As described above, the change transition data represents the transition of the change in the height of the ground surface, that is, the time series of the change in the height of the ground surface calculated from the measurement value of the height of the ground surface. The estimation unit 120 identifies the change in the height of the ground surface at a certain measurement time point included in the change transition data at the target point, and the change in the height of the ground surface at the selected measurement point at the same measurement time point as the measurement time point. The estimation unit 120 may calculate, for example, a statistical value of the change in the height of the ground surface at a certain measurement time point at the target point, and the change in the height of the ground surface identified as the change in the height of the ground surface at the same measurement time point as the measurement time point. The statistical value may be, for example, an average value, a median, a middle value, or a mode. The estimation unit 120 estimates that the calculated statistical value is an estimated value of the change in the height of the ground surface at the target point. Note that, when there is no measurement point other than the target point that satisfies the target condition among the target points included in the specified area, the change in the height of the ground surface at the target point may be the estimated value of the change in the height of the ground surface at the target point. The estimation unit 120 estimates each of the estimated values ​​of the change in height of the ground surface at the target point in the same manner. The estimation unit 120 estimates that the time series of the estimated values ​​of the change in height of the ground surface at the target point is an estimate of the progression of the change in height of the ground surface at the target point.

[0067] The estimation unit 120 may estimate an estimated value of the change in height of the ground surface at a measurement point included in the specified area by selecting the measurement point as a target point and performing the above-mentioned process. The estimation unit 120 may similarly estimate an estimated value of the transition of the change in height of the ground surface at each of the measurement points included in the specified area.

[0068] The estimation unit 120 generates estimated change transition data, which is data on the transition of the estimated value of the change in height of the ground surface for each measurement point within the specified range. The estimated change transition data may be data including a combination of data representing the measurement time point at which the estimated value of the change in height was obtained and the estimated value of the change in height of the ground surface.

[0069] The estimation unit 120 generates estimated data including, for each of the measurement points within the specified range, point information indicating the position of the measurement point and estimated change transition data which is data on the transition of the estimated value of the change in height of the earth's surface.

[0070] The estimation unit 120 sends to the output unit 140 a combination of point information indicating the position of each measurement point included in the specified area and estimated change trend data indicating the trend of the estimated value of the change in height of the earth's surface (i.e., the above-mentioned estimated data).

[0071] <<Determination Unit 110>> The determination unit 110 receives point information of the target point from the estimation unit 120. The determination unit 110 may further receive a value of geospatial information of the target point from the estimation unit 120. The determination unit 110 may receive a value of geospatial information of the target point from the geospatial information storage device 300 via the geospatial information acquisition unit 160. In the following, a case will be described in which the estimation unit 120 is configured to send the value of the geospatial information of the target point to the determination unit 110, and the determination unit 110 is configured to receive the value of the geospatial information of the target point from the estimation unit 120. The determination unit 110 may determine a selection condition based on the point information of the target point. The determination unit 110 may determine a selection condition based on the value of the geospatial information of the target point. The determination unit 110 may determine a selection condition based on the point information of the target point and the value of the geospatial information of the target point. The determination unit 110 sends the determined selection condition, in other words, information representing the determined selection condition, to the estimation unit 120.

[0072] <<Details of selection conditions>> A selection condition based on the point information of a target point (hereinafter referred to as a first selection condition) may be, for example, that the distance from the position of the target point is equal to or less than a predetermined distance.

[0073] The selection condition based on the point information of the target point and the geospatial information of the target point may satisfy a first selection condition and a selection condition based on the geospatial information of the target point (hereinafter referred to as a second selection condition).

[0074] The second selection condition may be, for example, that a value of a predetermined type of geospatial information is the same as a value of the predetermined type of geospatial information of the target point.

[0075] The second selection condition may be, for example, that the value of the predetermined type of geospatial information is close to the value of the predetermined type of geospatial information of the target point compared with a predetermined criterion. In this case, if a distance can be defined for the value of the predetermined type of geospatial information, the second selection condition may be that the distance from the value of the predetermined type of geospatial information to the value of the predetermined type of geospatial information of the target point is smaller than a predetermined value. The values ​​of the geospatial information may be divided into a plurality of categories. In that case, the second selection condition may be, for example, that the value of the geospatial information is included in a category that includes the value of the geospatial information of the target point. The second selection condition may be a condition regarding the values ​​of a plurality of types of geospatial information.

[0076] Specifically, the second selection condition may be, for example, that the value of urban land use among the geospatial information is the same as the value of urban land use of the target point. The second selection condition may be, for example, that the value of artificial terrain classification is the same as the value of artificial terrain classification of the target point. The second selection condition may be, for example, that the value of surface geology is the same as the value of surface geology of the target point. The second selection condition may be, for example, that at least one of the value of urban land use, the value of artificial terrain classification, and the value of surface geology is common to the target point.

[0077] The second selection condition may be, for example, that the value of the building information in the geospatial information is the same as the value of the building information of the target point. In this case, the selection condition may be that only the second selection condition is satisfied.

[0078] <<Geospatial information acquisition unit 160>> The geospatial information acquisition unit 160 acquires a value of geospatial information from the geospatial information storage device 300. For example, the geospatial information acquisition unit 160 receives a request for a value of geospatial information, in which point information of a measurement point is specified (i.e., including point information of a measurement point), from the estimation unit 120. The geospatial information acquisition unit 160 may receive a plurality of requests for values ​​of geospatial information including point information of a plurality of measurement points from the estimation unit 120. The geospatial information acquisition unit 160 reads out a predetermined type of geospatial information at a point represented by the point information specified in the received request from the geospatial information storage device 300. Specifically, the geospatial information acquisition unit 160 transmits a request for the value of geospatial information requested by the received request to the geospatial information storage device 300. Then, the geospatial information acquisition unit 160 receives a predetermined type of geospatial information at a point represented by the point information specified in the received request from the geospatial information storage device 300. The predetermined type may be a predetermined part of all types of geospatial information. The predetermined type may be all types of geospatial information.

[0079] The geospatial information acquisition unit 160 may similarly receive a request for the value of geospatial information of the target point (e.g., a request for the value of geospatial information including point information of the target point) from the determination unit 110. The geospatial information acquisition unit 160 may similarly read out the value of the geospatial information at the point represented by the point information of the target point from the geospatial information storage device 300. The geospatial information acquisition unit 160 sends out the value of the geospatial information at the point represented by the point information of the target point that has been read out from the geospatial information storage device 300, i.e., that has been received from the geospatial information storage device 300, to the determination unit 110.

[0080] <<Output Unit 140>> The output unit 140 receives an estimated value of the change in height of the ground surface at a measurement point in the specified area from the estimation unit 120. Specifically, the output unit 140 receives the above-mentioned estimation data including an estimated value of the change in height of the ground surface at a measurement point in the specified area from the estimation unit 120. The output unit 140 outputs the received estimated value of the change in height of the ground surface to the output destination device 400. The output unit 140 may output an estimated value of the change in height of the ground surface at a predetermined measurement time point to the output destination device 400. For example, the output unit 140 may output an estimated value of the change in height of the ground surface at a measurement time point designated by a user of the estimation device 100 to the output destination device 400. The output unit 140 may output the estimated value of the change in height of the ground surface at each measurement time point from the oldest measurement time point to the newest measurement time point included in the estimation data to the output destination device 400 in order. The output unit 140 may output the estimation data to the output destination device 400. As described below, when the destination device 400 is a computer, the output unit 140 may output to the destination device 400 an estimated value of the change in height of the earth's surface at the measurement time instructed by the destination device 400 .

[0081] <<Output destination device 400>> The destination device 400 may be, for example, a display. In this case, the output unit 140 may display, on the destination device 400, graphic information such as a graph representing an estimated value of a change in the height of the earth's surface or text information. The destination device 400 may be, for example, a storage device. In this case, the output unit 140 may store, in the destination device 400, information representing an estimated value of a change in the height of the earth's surface. The destination device 400 may be a computer such as a terminal device or a server device. In this case, the output unit 140 may transmit, to the destination device 400, information representing an estimated value of a change in the height of the earth's surface.

[0082] <<Operation>> Next, the operation of this embodiment will be described in detail with reference to the drawings.

[0083] FIG. 2 is a flowchart showing an example of the operation of the estimation device 100 of this embodiment.

[0084] In the example shown in Fig. 2, first, the estimation unit 120 receives measurement data acquired by the measurement data acquisition unit 150 from the measurement data storage device 200 (step S101). The estimation unit 120 acquires values ​​of geospatial information at measurement points included in the specified range of the measurement data from the geospatial information storage device 300 via the geospatial information acquisition unit 160 (step S102). The estimation unit 120 selects a target point from the measurement points included in the specified range of the measurement data (step S103). The estimation unit 120 may select one of the measurement points that has not yet been selected as a target point as the target point.

[0085] Next, the determination unit 110 determines the selection conditions as described above (step S104).

[0086] The estimation unit 120 selects a measurement point that satisfies the selection condition (step S105). The estimation unit 120 estimates an estimated value of the change transition data at the target point (i.e., the above-mentioned estimated change transition data) from the measurement data at the selected measurement point (i.e., the measurement point that satisfies the selection condition) (step S106). Note that in the description of this operation, the target point is also included in the measurement point that satisfies the selection condition. Therefore, in other words, the estimation unit 120 estimates an estimated value of the change transition data at the target point based on the measurement data at the target point and the measurement data at the measurement point that satisfies the selection condition.

[0087] If there is a measurement point included in the target range that has not been selected as a target point (NO in step S107), the operation of the estimation device 100 returns to step S103. If all measurement points included in the target range have been selected as target points (YES in step S106), the output unit 140 outputs the estimated value of the change transition data (i.e., the above-mentioned estimated data) to the output destination device 400 (step S108).

[0088] <<Effects>> Even if there is variation in the change in the measurement value (i.e., the measurement value of the change in the height of the ground surface) depending on the object, there is an effect that the accuracy of the estimation of the change (i.e., the estimated value of the change in the height of the ground surface) can be improved. This is because the estimation unit 120 estimates the estimated value of the change in the height of the ground surface of the target point based on the measurement value of the transition of the height of the ground surface of the target point among the measurement points and the measurement value of the transition of the height of the ground surface of the measurement point that satisfies the selection condition. Then, the determination unit 110 determines the selection condition based on the geospatial information of the target point (e.g., the value of a predetermined type of geospatial information).

[0089] <<First Modification of the First Embodiment>> Next, a first modified example of the first embodiment will be described. The estimation system 1 according to the first to third modified examples described below has the same configuration as the estimation system 1 according to the first embodiment. The differences from the first embodiment will be described below.

[0090] In this modification, the estimation unit 120 may estimate an estimated value of a change in height of the ground surface at a target point based on a weight based on the similarity of the geospatial information at the measurement point and the target point. For example, the estimation unit 120 may determine a weight according to the distance of the value of the geospatial information between the target point and the measurement point. The estimation unit 120 may determine the weight such that the shorter the distance of the value of the geospatial information, the smaller the weight value.

[0091] For example, in a case where the value of the geospatial information is classified into a plurality of categories, when the value of the geospatial information of the measurement point is the same as the value of the geospatial information of the target point, the estimation unit 120 may determine the weight value to be 1. In a case where the value of the geospatial information of the measurement point is different from the value of the geospatial information of the target point and the category of the value of the geospatial information of the measurement point is the same as the category of the value of the geospatial information of the target point, the estimation unit 120 may determine the weight value to be a value greater than 0 and less than 1. The estimation unit 120 does not need to determine a weight for a measurement point that does not satisfy the selection condition.

[0092] The estimation unit 120 may determine a weight for the measurement point according to the distance between the measurement point and the target point. For example, the estimation unit 120 may determine the weight for the measurement point from the distance between the measurement point and the target point using a function that converts the distance into a weight so that the relationship between the magnitude of the distance and the magnitude of the weight is not reversed.

[0093] The estimation unit 120 may determine a weight based on the similarity of the geospatial information between the measurement point and the target point and the distance between the measurement point and the target point. In this case, the estimation unit 120 may determine the weight for the measurement point to be the product of the weight based on the similarity of the geospatial information between the measurement point and the target point and the weight based on the distance between the measurement point and the target point.

[0094] For example, the estimation unit 120 may calculate the product of the measured value of the change in height of the ground surface at the measurement point that satisfies the selection condition and the weight determined for the measurement point. The estimation unit 120 may calculate the sum of the above-mentioned products calculated for all measurement points that satisfy the selection condition. The estimation unit 120 may calculate the sum of the weights of the measurement points that satisfy the selected scene. Then, the estimation unit 120 may divide the sum of the above-mentioned products by the sum of the above-mentioned weights to obtain an estimate of the change in height of the ground surface at the target point.

[0095] <<Second Modification of the First Embodiment>> Next, a second modified example of the first embodiment will be described.

[0096] Generally, when observation is performed by a radar mounted on an air vehicle such as an artificial satellite, if the target point is a water surface, the electromagnetic waves emitted from the antenna are specularly reflected by the rippling water surface, and the electromagnetic waves reflected at a point on the water surface where the normal direction coincides with the direction of the electromagnetic waves at the time of measurement return to the direction of the antenna. Since the shape of the water surface changes in various ways depending on the size and shape of the waves, it can be considered that a moving antenna does not receive electromagnetic waves from the same point at the same height at multiple points in time. Therefore, when the measurement point is a water surface, it is difficult to obtain an accurate measurement value of the transition of the water surface height at the measurement point by the synthetic aperture radar. Such a measurement value of the transition of the water surface height can be considered as noise. Furthermore, in this disclosure, the transition of the height of a structure or the ground is the subject of measurement, but the water surface is not the subject of measurement. When the ground surface of the target point is a water surface (for example, when the value of the natural terrain classification, which is a type of geospatial information, of the target point represents a water surface), the estimation unit 120 does not need to estimate an estimated value of the change in the ground surface height of the target point. In this case, the estimation unit 120 may set all estimated values ​​of changes in the height of the ground surface at the target point to 0. Furthermore, the calculation of the estimated value of the height of the ground surface at the target point does not require the use of the measured value of the height of the ground surface at the measurement point where the ground surface is a water surface.

[0097] <<Third Modification of the First Embodiment>> Next, a third modified example of the first embodiment will be described.

[0098] The geospatial information may include a land change history. The land change history may be represented by values ​​of at least any of the above-mentioned geospatial information at multiple past points in time. The estimation unit 120 may select a measurement point based on the land change history from the measurement points that satisfy the selection condition. Specifically, the estimation unit 120 may further select a measurement point whose land change history is the same as the land change history of the target point from the measurement points that satisfy the selection condition. The estimation unit 120 may estimate an estimated value of the transition of the change in the ground surface height of the target point based on the measurement value of the transition of the ground surface height of the measurement point selected in this manner.

[0099] <<Fourth Modification of the First Embodiment>> The estimation device 100 may include a measurement data storage device 200. The estimation device 100 may include a geospatial information storage device 300. The estimation device 100 may include the measurement data storage device 200 and the geospatial information storage device 300.

[0100] <<Fifth Modification of the First Embodiment>> The measurement data stored in the measurement data storage device 200 may further include change transition data calculated in advance based on the height transition data. In this case, the estimation unit 120 does not need to calculate the change transition data.

[0101] <<Sixth Modification of the First Embodiment>> The first embodiment can also be modified by combining any two or more of the first to fifth modifications described above.

[0102] <Second embodiment> Next, a second embodiment of the present disclosure will be described in detail with reference to the drawings.

[0103] <<Configuration>> FIG. 3 is a block diagram illustrating an example of the configuration of the estimation system 2 according to this embodiment.

[0104] The estimation system 2 shown in FIG. 3 is the same as the estimation system 1 of the first embodiment, except for the differences described below. The measurement data storage device 200 of this embodiment is the same as the measurement data storage device 200 of the first embodiment. The geospatial information storage device 300 of this embodiment is the same as the geospatial information storage device 300 of the first embodiment. Compared to the estimation system 1 of the first embodiment, the estimation system 2 includes an estimation device 101 instead of the estimation device 100. The estimation device 101 includes a determination unit 130 in addition to the elements of the estimation device 100 of the first embodiment. The elements of the estimation device 101 of this embodiment other than the determination unit 130 are the same as the elements of the estimation device 100 of the first embodiment to which the same names and symbols are assigned, except for the differences described below.

[0105] <<Determination Unit 110>> The selection condition determined by the determination unit 110 of this embodiment may be that the value of the building information, which is a type of geospatial information, is the same as the value of the building information of the target point. The determination unit 110 of this embodiment may determine the above-mentioned selection condition.

[0106] <<Estimation section 120>> The estimation unit 120 of this embodiment operates in the same manner as the estimation unit 120 of the first embodiment. The estimation unit 120 of this embodiment further transmits the above-mentioned estimation data to the determination unit 130. The estimation unit 120 of this embodiment may further transmit values ​​of building information, which is a type of geospatial information, at measurement points within the specified range to the determination unit 130.

[0107] <<Judgment unit 130>> The determination unit 130 receives the estimated data from the estimation unit 120. The determination unit 130 may further receive values ​​of building information at measurement points within the specified range from the estimation unit 120. The determination unit 130 may receive values ​​of building information, which is a type of geospatial information, at a point indicated by point information included in the estimated data from the geospatial information storage device 300 via the geospatial information acquisition unit 160.

[0108] In general, it is possible to determine whether the ground surface is a building by, for example, an aerial photograph, but it is not necessarily easy to determine the type of a building by only an aerial photograph. When it is desired to obtain the type of an individual building whose range is obtained as building information, it is possible, for example, for an investigator to go to the site and determine the type of the building, but this requires time and cost. In addition, there are cases where the type of the building cannot be determined from the appearance of the building. When the measurement point is a building, the determination unit 130 may estimate the type of the building including the measurement point based on an estimated value of the transition of the change in the height of the ground surface. For example, when the building is made of reinforced concrete, the variation in height due to the difference in temperature between summer and winter (referred to as seasonal variation in height) is large compared to when the building is a wooden building. When the building is a building constructed of a steel frame and panel walls, the seasonal variation in height tends to be even larger compared to wooden buildings and reinforced concrete buildings. The determination unit 130 may determine the type of the building by, for example, a determiner that determines the magnitude of seasonal variation in height depending on the type of building, which has been learned in advance by machine learning. As the machine learning method in this case, any of the existing machine learning methods may be used. The height variation is not necessarily limited to seasonal variation of height. The determination unit 130 may determine the type of structure for each measurement point that is a structure included in the specified area. The determination unit 130 may set information indicating that the measurement point is not a structure as the type of the structure for the measurement point that is not a structure.

[0109] The determination unit 130 may acquire the building map of the specified area from the geospatial information storage device 300 via the geospatial information acquisition unit 160. In this case, the building map is stored in advance in the geospatial information storage device 300 as one type of geospatial information.

[0110] The determination unit 130 may send information representing the type of structure at the measurement point included in the specified area to the output unit 140. The determination unit 130 may further send information representing the acquired structure map to the output unit 140.

[0111] <<Output Unit 140>> The output unit 140 of this embodiment has the same functions as the output unit 140 of the first embodiment. The output unit 140 of this embodiment further receives information representing the type of structure at the measurement point included in the specified area from the determination unit 130. The output unit 140 of this embodiment may further receive information representing a structure map from the determination unit 130. The output unit 140 outputs the received information representing the type of structure at the measurement point included in the specified area to the output destination device 400.

[0112] The output unit 140 may superimpose a mark representing the type of structure at the measurement point on the structure map at a position corresponding to the position of the measurement point. The output unit 140 may output the structure map on which the mark representing the type of structure is superimposed to the output destination device 400.

[0113] The output unit 140 may determine the type of the building included in the building map based on the estimated type of the building of the measurement point included in the area of ​​the building. The output unit 140 may change at least one of the pattern and color of the area of ​​the building included in the building map according to the determined type of the building. In this case, at least one of the pattern and color of the area of ​​the building may be predetermined for each type of building. The method of determining the type of the building may be a method appropriately determined in advance. For example, when the building includes only one measurement point, the output unit 140 may determine the type of the building to the type of the building determined for that measurement point. For example, when the building includes multiple measurement points, the output unit 140 may determine the type of the building to the type of the building determined for the most measurement points. When the type of the building cannot be determined, such as when there is no measurement point included in the area of ​​the building and when there are multiple types of buildings determined for the most measurement points, the output unit 140 does not need to change the pattern and color of the area of ​​the building.

[0114] <<Operation>> Next, the operation of the estimation device 101 of this embodiment will be described in detail with reference to the drawings.

[0115] 4 is a flowchart showing an example of the operation of the estimation device 101 of this embodiment. The operations from step S101 to step S107 of the estimation device 101 of this embodiment are the same as the operations from step S101 to step S107 of the estimation device 100 of the first embodiment. After the operation of step S107, the estimation device 101 of this embodiment performs the operation described below.

[0116] When the measurement point is included in the area of ​​a building, the determination unit 130 determines the type of building whose area includes the measurement point based on the above-mentioned estimated data of the measurement point (step S208). The determination unit 130 may determine the type of building for each of the measurement points included in the area of ​​any of the buildings.

[0117] The output unit 140 outputs the estimated value of the measurement data (ie, the above-mentioned estimated data) and the type of structure (step S209).

[0118] <<Effects>> This embodiment has the same effects as the first embodiment, for the same reasons that the effects of the first embodiment are obtained.

[0119] This embodiment also has the advantage that the type of the building can be known, because the determination unit 130 determines the type of the building based on the estimated data of the measurement points included in the area of ​​the building.

[0120] <<First Modification of the Second Embodiment>> The second embodiment can also be modified like the first to fifth modifications of the first embodiment.

[0121] <<Second Modification of the Second Embodiment>> The output unit 140 of this modified example outputs the received information indicating the type of structure at the measurement point included in the specified area to the output destination device 400, and does not need to output the estimated data. The estimation unit 120 of this modified example does not need to send the estimated data to the output unit 140. The output unit 140 of this modified example does not need to receive the estimated data from the estimation unit 120.

[0122] <Third embodiment> Next, a third embodiment of the present disclosure will be described in detail with reference to the drawings.

[0123] <<Configuration>> FIG. 5 is a block diagram illustrating an example of the configuration of the estimation device 102 according to this embodiment.

[0124] In the example illustrated in FIG. 5, the estimation device 102 according to an aspect of the present disclosure includes a determination unit 110 and an estimation unit 120. The determination unit 110 determines a selection condition based on geospatial information of a target point among a plurality of measurement points at which a change in the height of the ground surface is measured by a synthetic aperture radar. The determination unit 110 may determine the selection condition in the same manner as the determination unit 110 of the first embodiment. The estimation unit 120 estimates an estimated value of a change in the height of the ground surface at the target point based on a measurement value of a change in the height of the ground surface at the target point and a measurement value of a change in the height of the ground surface at the measurement point that satisfies the selection condition. The estimation unit 120 may estimate an estimated value of a change in the height of the ground surface at the target point in the same manner as the estimation unit 120 of the first embodiment.

[0125] <<Operation>> FIG. 6 is a flowchart illustrating an example of the operation of the estimation device 102 according to this embodiment.

[0126] 6, first, the determination unit 110 determines a selection condition based on geospatial information of the target point (step S301). Next, the estimation unit 120 estimates an estimate of a change in the height of the ground surface at the target point based on a measurement value of the change in the height of the ground surface at the target point and a measurement value of the change in the height of the ground surface at a measurement point that satisfies the selection condition (step S302).

[0127] <<Effects>> This embodiment has the same effects as the first embodiment, for the same reasons that the effects of the first embodiment are obtained.

[0128] <<Other embodiments>> The above-mentioned estimation device 100, the estimation device 101, the estimation device 102, the measurement data storage device 200, and the geospatial information storage device 300 can each be realized by a computer. The computer includes a memory in which a program read from a storage medium is loaded, and a processor that executes the program. The computer may be realized by a combination of multiple computers connected to each other so as to be able to communicate with each other. The estimation device 100, the estimation device 101, the estimation device 102, the measurement data storage device 200, and the geospatial information storage device 300 can each be realized by dedicated hardware. The dedicated hardware may be realized by, for example, one circuit, or multiple circuits connected to each other so as to be able to communicate with each other. The estimation device 100, the estimation device 101, the estimation device 102, the measurement data storage device 200, and the geospatial information storage device 300 can also be realized by a combination of the above-mentioned computer and dedicated hardware.

[0129] FIG. 7 is a diagram illustrating an example of a hardware configuration of a computer 1000 that can realize an apparatus such as an estimation apparatus according to an embodiment of the present disclosure. Referring to FIG. 7, the computer 1000 includes a processor 1001, a memory 1002, a storage device 1003, and an I / O (Input / Output) interface 1004. The computer 1000 can also access a storage medium 1005. The memory 1002 and the storage device 1003 are, for example, storage devices such as a RAM (Random Access Memory) and a hard disk. The storage medium 1005 is, for example, a storage device such as a RAM or a hard disk, a ROM (Read Only Memory), or a portable storage medium. The storage device 1003 may be the storage medium 1005. The processor 1001 can read and write data and programs from and to the memory 1002 and the storage device 1003. The processor 1001 can access, for example, other devices via the I / O interface 1004. The processor 1001 can access the storage medium 1005. The storage medium 1005 stores a program that causes the computer 1000 to operate as the device according to the above-described embodiment.

[0130] The processor 1001 loads a program stored in the storage medium 1005, which causes the computer 1000 to operate as the estimation device according to the above-described embodiment, into the memory 1002. The processor 1001 then executes the program loaded into the memory 1002, causing the computer 1000 to operate as the estimation device according to the above-described embodiment.

[0131] The processor 1001 loads a program stored in the storage medium 1005, which causes the computer 1000 to operate as the measurement data storage device according to the embodiment described above, into the memory 1002. The processor 1001 then executes the program loaded into the memory 1002, causing the computer 1000 to operate as the measurement data storage device according to the embodiment described above.

[0132] The processor 1001 loads a program stored in the storage medium 1005, which causes the computer 1000 to operate as the geospatial information storage device according to the embodiment described above, into the memory 1002. The processor 1001 then executes the program loaded into the memory 1002, causing the computer 1000 to operate as the geospatial information storage device according to the embodiment described above.

[0133] The determination unit 110, the estimation unit 120, the determination unit 130, the output unit 140, the measurement data acquisition unit 150, and the geospatial information acquisition unit 160 can be realized, for example, by a processor 1001 that executes a program loaded in a memory 1002. The first input / output unit 220 and the second input / output unit 320 can be realized, for example, by a processor 1001 that executes a program loaded in a memory 1002. The measurement data storage unit 210 and the geospatial information storage unit 310 can be realized by a memory 1002 or a storage device 1003 such as a hard disk device included in the computer 1000. A part or all of the determination unit 110, the estimation unit 120, the determination unit 130, the output unit 140, the measurement data acquisition unit 150, the geospatial information acquisition unit 160, the first input / output unit 220, and the second input / output unit 320 can also be realized by a dedicated circuit that realizes the function of each unit. A part or the whole of the measurement data storage unit 210 and the geospatial information storage unit 310 may be realized by a dedicated circuit for realizing the function of each unit.

[0134] Furthermore, some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes.

[0135] (Appendix 1) A determination means for determining a selection condition based on geospatial information of a target point among a plurality of measurement points at which a change in the height of the ground surface is measured by the synthetic aperture radar; an estimation means for estimating an estimated value of a change in ground surface height at the target point based on a measurement value of a change in ground surface height at the target point and a measurement value of a change in ground surface height at the measurement point that satisfies the selection condition; An estimation device comprising:

[0136] (Appendix 2) The determining means determines the selection condition based on a type of earth surface based on geospatial information of the target point and a distance from the target point. 2. An estimation apparatus as described in claim 1.

[0137] (Appendix 3) The estimation means estimates the estimated value based on a weight based on a similarity in type of ground surface between the measurement point and the target point. 3. The estimation device according to claim 1 or 2.

[0138] (Appendix 4) The estimation means estimates the estimated value based on the weight that is further based on a distance between the measurement point and the target point. 4. An estimation apparatus according to claim 3.

[0139] (Appendix 5) The estimation means further selects the measurement point from the measurement points that satisfy the selection condition based on a land change history at the measurement point, and estimates the estimated value based on the measurement value at the measurement point. 5. The estimation device according to claim 1 .

[0140] (Appendix 6) When the ground surface at the target point is a water surface, the estimation means does not estimate the estimated value at the target point, and when the ground surface at the measurement point is a water surface, the estimation means does not use a measurement value of the height variation at the measurement point to estimate the estimated value at the target point. 6. The estimation device according to any one of claims 1 to 5.

[0141] (Appendix 7) The determining means determines the selection condition so as to select the measurement point included in the area of ​​a building when the target point is included in the area of ​​the building in the geospatial information. 7. The estimation device according to any one of claims 1 to 6.

[0142] (Appendix 8) a determination means for determining, when the target point is included in an area of ​​a structure in the geospatial information, a type of the structure including the target point based on the characteristics of the estimated value; 8. The estimation device according to claim 1, further comprising:

[0143] (Appendix 9) determining a selection condition based on geospatial information of a target point among a plurality of measurement points at which the change in ground surface height is measured by the synthetic aperture radar; estimating an estimate of a change in ground surface height at the target point based on a measurement value of the change in ground surface height at the target point and a measurement value of the change in ground surface height at the measurement point that satisfies the selection condition; Estimation method.

[0144] (Appendix 10) determining the selection condition based on a type of ground surface based on geospatial information of the target point and a distance from the target point; Estimation method described in Appendix 9.

[0145] (Appendix 11) The estimated value is estimated based on a weight based on the similarity of the type of the ground surface at the measurement point and the target point. 11. The estimation method according to any one of appendix 9 or 10.

[0146] (Appendix 12) Estimating the estimate based on the weighting further based on a distance between the measurement point and the target point. Estimation method described in Appendix 11.

[0147] (Appendix 13) Further selecting the measurement points from the measurement points that satisfy the selection condition based on a land change history at the measurement points, and estimating the estimated value based on the measurement values ​​at the measurement points. 13. The estimation method according to any one of claims 9 to 12.

[0148] (Appendix 14) If the ground surface at the target point is a water surface, the estimated value at the target point is not estimated, and if the ground surface at the measurement point is a water surface, the measured value of the height variation at the measurement point is not used to estimate the estimated value at the target point. 14. The estimation method according to any one of claims 9 to 13.

[0149] (Appendix 15) When the target point is included in an area of ​​a building in the geospatial information, the selection condition is determined so as to select the measurement point included in the area of ​​the building. 15. The estimation method according to any one of claims 9 to 14.

[0150] (Appendix 16) If the target point is included in a region of a building in the geospatial information, a type of building including the target point is determined based on the characteristics of the estimated value. 16. The estimation method according to any one of appendix 9 to 15.

[0151] (Appendix 17) A determination process for determining a selection condition based on geospatial information of a target point among a plurality of measurement points at which a change in the height of the ground surface is measured by the synthetic aperture radar; an estimation process for estimating an estimated value of a change in ground surface height at the target point based on a measurement value of the change in ground surface height at the target point and a measurement value of the change in ground surface height at the measurement point that satisfies the selection condition; A storage medium that stores a program that causes a computer to execute the above.

[0152] (Appendix 18) The determination process determines the selection condition based on a type of earth surface based on geospatial information of the target point and a distance from the target point. 18. The storage medium of claim 17.

[0153] (Appendix 19) The estimation process estimates the estimated value based on a weight based on a similarity in type of the ground surface between the measurement point and the target point. 19. A storage medium according to any one of appendix 17 or 18.

[0154] (Appendix 20) The estimation process estimates the estimated value based on the weight that is further based on a distance between the measurement point and the target point. 20. The storage medium of claim 19.

[0155] (Appendix 21) The estimation process further selects the measurement points from the measurement points that satisfy the selection condition based on a land change history at the measurement points, and estimates the estimated value based on the measurement values ​​at the measurement points. A storage medium according to any one of appendixes 17 to 20.

[0156] (Appendix 22) In the estimation process, when the ground surface at the target point is a water surface, the estimated value at the target point is not estimated, and when the ground surface at the measurement point is a water surface, the measurement value of the height variation at the measurement point is not used to estimate the estimated value at the target point. 22. A storage medium according to any one of claims 17 to 21.

[0157] (Appendix 23) The determination process determines the selection condition so as to select the measurement point included in the area of ​​a building when the target point is included in the area of ​​the building in the geospatial information. 23. A storage medium according to any one of appendices 17 to 22.

[0158] (Appendix 24) The program is A determination process for determining the type of the structure including the target point based on the characteristics of the estimated value when the target point is included in an area of ​​a structure in the geospatial information. 24. The storage medium according to any one of appendices 17 to 23, further causing a computer to execute the steps.

[0159] Although the present invention has been described above with reference to the embodiment, the present invention is not limited to the above embodiment. 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]

[0160] 1. Estimation System 2. Estimation System 100 Estimator 101 Estimation device 102 Estimation device 110 Decision Section 120 Estimation part 130 Judgment section 140 Output section 150 Measurement data acquisition unit 160 Geospatial Information Acquisition Department 200 Measurement data storage device 210 Measurement data storage unit 220 1st input / output section 300 Geospatial information storage device 310 Geospatial information storage unit 320 2nd input / output section 400 Output device 1000 Computers 1001 Processor 1002 Memory 1003 Storage device 1004 I / O Interface 1005 Storage medium

Claims

1. an estimation means for selecting a target point, which is a measurement point at which an estimated value of a change in the height of the ground surface has not been obtained, from among a plurality of measurement points at which a change in the height of the ground surface has been measured by a synthetic aperture radar; A determination means for determining a selection condition based on a type of ground surface based on geospatial information of the target point and a distance from the target point, The estimation means estimates an estimated value of a change in ground surface height at the target point based on a measured value of a change in ground surface height at the target point and a measured value of a change in ground surface height at the measurement point that satisfies the selection condition. Estimation device.

2. The estimation means estimates the estimated value based on a weight based on a similarity in type of ground surface between the measurement point and the target point. The estimation device according to claim 1 .

3. The estimation means estimates the estimated value based on the weight that is further based on a distance between the measurement point and the target point. The estimation device according to claim 2 .

4. The estimation means further selects the measurement point from the measurement points that satisfy the selection condition based on a land change history at the measurement point, and estimates the estimated value based on the measurement value at the measurement point. The estimation device according to any one of claims 1 to 3.

5. When the ground surface at the target point is a water surface, the estimation means does not estimate the estimated value at the target point, and when the ground surface at the measurement point is a water surface, the estimation means does not use a measurement value of the height variation at the measurement point to estimate the estimated value at the target point. The estimation device according to any one of claims 1 to 4.

6. The determining means determines the selection condition so as to select the measurement point included in the area of ​​a building when the target point is included in the area of ​​the building in the geospatial information. The estimation device according to any one of claims 1 to 5.

7. a determination means for determining, when the target point is included in an area of ​​a structure in the geospatial information, a type of the structure including the target point based on the characteristics of the estimated value; The estimation device according to claim 1 , further comprising:

8. Among the measurement points at which the change in ground surface height has been measured by the synthetic aperture radar, a target point is selected which is a measurement point at which an estimated value of the change in ground surface height has not been obtained; determining a selection condition based on a type of ground surface based on geospatial information of the target point and a distance from the target point; estimating an estimate of a change in ground surface height at the target point based on a measurement value of the change in ground surface height at the target point and a measurement value of the change in ground surface height at the measurement point that satisfies the selection condition; Estimation method.

9. an estimation process of selecting a target point, which is a measurement point where an estimated value of a change in the height of the ground surface has not been obtained, from among a plurality of measurement points where the change in the height of the ground surface has been measured by the synthetic aperture radar; a determination process for determining a selection condition based on a type of earth surface based on geospatial information of the target point and a distance from the target point; The estimation process estimates an estimated value of a change in height of the ground surface at the target point based on a measured value of a change in height of the ground surface at the target point and a measured value of a change in height of the ground surface at the measurement point that satisfies the selection condition. program.

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