Urban landscape visibility evaluation method and application

Abstract

The invention provides an urban landscape visibility evaluation method and application, and the method is characterized in that the method comprises the steps: building an urban model and a landscape model corresponding to at least one designated landscape according to urban building landscape data; selecting a plurality of point locations in each landscape model as landscape points; setting a corresponding point location for each building of the city model as a building viewpoint; in the city model, selecting a plurality of main streets according to the pedestrian flow data, and selecting a plurality of point locations in each main street as street viewpoints; dividing the city model into a plurality of grid parcels, and calculating to obtain landscape visibility values of the grid parcels according to whether connection lines between the building view points and the landscape points and connection lines between the street view points and the landscape points in the grid parcels are shielded or not; and calculating the comprehensive landscape visibility value of the city according to the landscape visibility values of all the grid plots. In a word, the method can evaluate the comprehensive landscape visibility value of the city.

Description

Technical Field

[0001] The present invention belongs to the field of urban design and planning, and specifically relates to an urban landscape visibility assessment method, and the application of the assessment method in a sightline optimization design method and device. Background Art

[0002] With the development of urban design discipline, the role of urban landscape visibility has been increasingly studied and discussed. First, landscape visibility has always been a key factor in the evolution of urban systems. However, the potential value of human visual perception has not been fully studied. It was not until recent decades that researchers realized that people's spatial exploration behavior and visual cognition are largely related to changes in landscape visual accessibility. In turn, the visual spatial cognition of a place can activate the dynamics of urban space. The importance of landscape analysis and the terminology of analytical methods, such as "visual absorption", "visual connection", "visual corridor" or "visual invasion". Second, to some extent, the value of the visual environment is as important as quantitative indicators such as accessibility. The activity behavior driven by people's landscape perception of the site will have a long-term impact on the mobility of the region, the production and living space of the city, and even become a sense of place. Visible green space can largely expand the connection of sensory green corridors, enabling cities to provide more visually resilient spaces. Therefore, a reasonable visual landscape layout can greatly enhance regional value. Third, vision is the main way for humans to connect with the surrounding environment; visibility analysis can be used as a common perspective to study the relationship between people and landscape.

[0003] However, existing landscape visibility analysis methods are not intelligent and responsive enough, and these methods focus more on static analysis of existing results. Summary of the invention

[0004] The present invention is made to solve the above-mentioned problem, and aims to provide a method and application for evaluating the visibility of urban landscape.

[0005] The invention provides a city landscape visibility assessment method, which is used for obtaining a comprehensive landscape visibility value according to city building landscape data and pedestrian flow data, and has the following characteristics, comprising the following steps: a model construction step, constructing a city model and a landscape model corresponding to at least one designated landscape according to the city building landscape data; a landscape point setting step, selecting multiple points in each landscape model as landscape points; a building viewpoint setting step, setting corresponding points for each building in the city model as building viewpoints; a street viewpoint setting step, selecting n streets with the highest pedestrian and vehicle traffic density as main streets according to pedestrian flow data in the city model, and selecting multiple points in each main street as street viewpoints; a grid division step, dividing the city model into multiple grid plots; a landscape visibility value calculation step, for each grid plot, calculating the landscape visibility value of the grid plot according to whether there is occlusion between each building viewpoint and street viewpoint in the grid plot and each landscape point; and a comprehensive landscape visibility value calculation step, calculating the comprehensive landscape visibility value of the city according to the landscape visibility values ​​of all grid plots.

[0006] The urban landscape visibility assessment method provided by the present invention may also have the following features: wherein, in the landscape visibility value calculation step, it is determined whether there is any obstruction in the line between the building viewpoint and the landscape point. If so, the visibility value between the building corresponding to the building viewpoint and the designated landscape corresponding to the landscape point is set to 1, if not, the visibility value is set to 0; it is determined whether there is any obstruction in the line between the street viewpoint and the landscape point. If so, the visibility value between the main street corresponding to the street viewpoint and the designated landscape corresponding to the landscape point is set to 1, if not, the visibility value is set to 0; the landscape visibility value of the grid plot is the sum of the visibility values ​​corresponding to all buildings and main streets in the grid plot; and in the comprehensive landscape visibility value calculation step, the comprehensive landscape visibility value is the sum of all landscape visibility values.

[0007] The urban landscape visibility assessment method provided by the present invention may also have the following features: wherein the designated landscape includes landscape mountains and landscape waterways, and for the landscape model corresponding to the landscape mountains, points on multiple different contour lines in the mountain are selected as landscape points, and for the landscape model corresponding to the landscape waterway, multiple points in the waterway are selected as landscape points at fixed intervals.

[0008] The urban landscape visibility assessment method provided by the present invention may also have the following feature: the main streets are divided according to fixed intervals to obtain a plurality of street viewpoints.

[0009] The present invention also provides a method for optimizing the sight line of a city, which is used to obtain an optimized sight line design scheme for a city according to urban building landscape data and pedestrian flow data. The method has the following characteristics and comprises the following steps: step S1, based on the urban building landscape data and pedestrian flow data, using an urban landscape visibility evaluation method, calculating a comprehensive landscape visibility value corresponding to the city as an initial comprehensive landscape visibility value; step S2, adjusting the building data in the urban building landscape data; step S3, based on the urban building landscape data and pedestrian flow data, using an urban landscape visibility evaluation method, calculating a comprehensive landscape visibility value corresponding to the city as an updated comprehensive landscape visibility value; step S4, judging whether a termination condition is met based on the updated comprehensive landscape visibility value and the initial comprehensive landscape visibility value, and if so, using the adjusted building data as the optimized sight line design scheme for a city, and if not, executing step S2, wherein the urban landscape visibility evaluation method is any one of the urban landscape visibility evaluation methods mentioned above.

[0010] The urban landscape sight line optimization design method provided by the present invention may also have the following features: wherein the building data includes the density, height, bottom side length, angle between the long side of the building and the specified landscape, projection length of the long side of the building on the specified landscape direction, and the distance between the building viewpoint and the landscape point.

[0011] The present invention also provides a city landscape sight optimization design device, which is used to obtain a city landscape sight optimization design scheme based on city building landscape data and pedestrian flow data, and has the following characteristics, including: an initial comprehensive landscape visibility value calculation module, which is used to calculate the comprehensive landscape visibility value corresponding to the city as the initial comprehensive landscape visibility value based on the city building landscape data and pedestrian flow data, using the city landscape visibility evaluation method; an adjustment module, which is used to adjust the building data in the city building landscape data; an update module, which is used to calculate the comprehensive landscape visibility value corresponding to the city as the updated comprehensive landscape visibility value based on the city building landscape data and pedestrian flow data, using the city landscape visibility evaluation method; a judgment module, which is used to judge whether the termination condition is met based on the updated comprehensive landscape visibility value and the initial comprehensive landscape visibility value, if so, the adjusted building data is used as the city landscape sight optimization design scheme, if not, the adjustment module is controlled to run, wherein the city landscape visibility evaluation method is any one of the above-mentioned city landscape visibility evaluation methods.

[0012] Functions and Effects of the Invention

[0013] According to the urban landscape visibility assessment method and application involved in the present invention, because, on the one hand, a corresponding model is constructed according to the urban architectural landscape data and the building viewpoint, street viewpoint and landscape viewpoint are set, the urban model is divided into grid plots, and the building viewpoint and landscape viewpoint and street viewpoint and landscape viewpoint are used for calculation, so as to obtain the comprehensive landscape visibility value of the entire city; on the other hand, some building data in the urban architectural landscape data are adjusted to generate an updated comprehensive landscape visibility value, and compared with the initial comprehensive landscape visibility value corresponding to the original urban architectural landscape data, so as to confirm whether the adjusted data has an optimization effect on the urban landscape sight, and then generate an urban landscape sight optimization design plan by dynamically adjusting the building data. Therefore, the urban landscape visibility assessment method and application of the present invention can evaluate the comprehensive landscape visibility value of the city, and dynamically adjust the building data according to the comprehensive landscape visibility value to generate an urban landscape sight optimization design plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a block diagram of a device for optimizing the design of urban landscape sight lines in an embodiment of the present invention;

[0015] Figure 2 is a flow chart of a method for evaluating urban landscape visibility in an embodiment of the present invention;

[0016] Figure 3 It is a flow chart of the urban landscape sight line optimization design method in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the following embodiments and drawings are combined to specifically illustrate the urban landscape visibility assessment method and application of the present invention.

[0018] In this embodiment, a city landscape sight optimization design device is provided, which is used to obtain a city landscape sight optimization design scheme based on city building landscape data and pedestrian flow data. In this embodiment, the landscape sight optimization design is performed on a specified city. In other embodiments, the specified city can be changed to other specified area ranges, such as districts, counties or plots.

[0019] Figure 1 It is a block diagram of a device for optimizing the design of urban landscape sight lines in an embodiment of the present invention.

[0020] like Figure 1 As shown, the urban landscape sight line optimization design device 100 includes an initial comprehensive landscape visibility value calculation module 10, an adjustment module 20, an update module 30, a judgment module 40 and a control module 50 for controlling the operation of the above modules.

[0021] The initial comprehensive landscape visibility value calculation module 10 is used to calculate the comprehensive landscape visibility value corresponding to the city as the initial comprehensive landscape visibility value according to the urban building landscape data and the pedestrian flow data by adopting the urban landscape visibility evaluation method.

[0022] Figure 2 4 is a flow chart of a method for evaluating urban landscape visibility in an embodiment of the present invention.

[0023] like Figure 2 As shown, the urban landscape visibility assessment method includes the following steps:

[0024] Step T1 is a model building step, which builds a city model and a landscape model corresponding to at least one designated landscape according to the city building landscape data.

[0025] In this embodiment, the designated landscape includes landscape mountains and landscape waterways. In other embodiments, the designated landscape also includes specific buildings arranged according to actual needs.

[0026] Step T2 is the step of setting the landscape points, in which a plurality of points are selected in each landscape model as the landscape points.

[0027] For the landscape model corresponding to the landscape mountain, points on multiple different contour lines in the mountain are selected as landscape points. For the landscape model corresponding to the landscape waterway, multiple points in the waterway are selected as landscape points at fixed intervals. In other embodiments, for a specific building as a designated landscape, a specific part of the specific building can be used as a landscape point, such as a specific decoration, outline shape, etc. that can reflect the identity of the specific building.

[0028] Step T3 is the building viewpoint setting step, in which corresponding points are set for each building in the city model as the building viewpoint.

[0029] Step T4 is the street viewpoint setting step. In the city model, n streets with the highest pedestrian and vehicle traffic density are selected as main streets according to pedestrian flow data, and multiple points are selected in each main street as street viewpoints.

[0030] The main streets are divided according to fixed intervals to obtain multiple street viewpoints. In this embodiment, the fixed interval is 50 meters.

[0031] Step T5 is a grid division step, which divides the city model into a plurality of grid plots. In this embodiment, each grid plot has the same area.

[0032] Step T6 is a landscape visibility value calculation step. For each grid plot, the landscape visibility value of the grid plot is calculated based on whether there is any obstruction between the lines connecting each building view point and street view point in the grid plot and each landscape point.

[0033] In step T6, it is determined whether there is any obstruction on the line between the building viewpoint and the landscape point. If so, the visibility value between the building corresponding to the building viewpoint and the designated landscape corresponding to the landscape point is set to 1, otherwise, the visibility value is set to 0. It is determined whether there is any obstruction on the line between the street viewpoint and the landscape point. If so, the visibility value between the main street corresponding to the street viewpoint and the designated landscape corresponding to the landscape point is set to 1, otherwise, the visibility value is set to 0. The landscape visibility value of a grid plot is the sum of the visibility values ​​corresponding to all buildings and main streets in the grid plot.

[0034] Step T7 is a step of calculating the comprehensive landscape visibility value, and the comprehensive landscape visibility value of the city is calculated based on the landscape visibility values ​​of all grid plots.

[0035] The comprehensive landscape visibility value in step T7 is the sum of all landscape visibility values.

[0036] In this embodiment, step T2, step T3, step T4 and step T5 are executed in sequence. In other embodiments, the order of step T2 to step T5 can be adjusted according to actual needs, or part or all of step T2 to step T5 can be executed synchronously.

[0037] The adjustment module 20 is used to adjust the building data in the urban building landscape data.

[0038] The building data include the building density, height, bottom length, angle between the long side of the building and the specified landscape, projection length of the long side of the building to the specified landscape direction, and the distance between the building viewpoint and the landscape point.

[0039] The updating module 30 is used to calculate the comprehensive landscape visibility value corresponding to the city according to the urban building landscape data and the pedestrian flow data, using the urban landscape visibility evaluation method, as an updated comprehensive landscape visibility value.

[0040] The judgment module 40 is used to judge whether the termination condition is met according to the updated comprehensive landscape visibility value and the initial comprehensive landscape visibility value. If so, the adjusted building data is used as the urban landscape sight optimization design scheme. If not, the adjustment module 20 is controlled to run. In this embodiment, the termination condition is that the difference between the updated comprehensive landscape visibility value and the initial comprehensive landscape visibility value is greater than a preset value.

[0041] The control module 50 stores a control program for controlling the operation of each module.

[0042] The following describes the process of performing a method for optimizing a city landscape sight line using the city landscape sight line optimization design device 100 in conjunction with the accompanying drawings.

[0043] Figure 3 It is a flow chart of the urban landscape sight line optimization design method in an embodiment of the present invention.

[0044] like Figure 3 As shown in the figure, the urban landscape sight line optimization design method includes the following steps:

[0045] Step S1, using the initial comprehensive landscape visibility value calculation module 10 to calculate the comprehensive landscape visibility value corresponding to the city as the initial comprehensive landscape visibility value according to the urban building landscape data and the pedestrian flow data and using the urban landscape visibility evaluation method.

[0046] Step S2: using the adjustment module 20 to adjust the building data in the urban building landscape data.

[0047] Step S3, using the updating module 30 to calculate the comprehensive landscape visibility value corresponding to the city according to the urban building landscape data and the pedestrian flow data and using the urban landscape visibility evaluation method, as an updated comprehensive landscape visibility value.

[0048] Step S4, using the judgment module 40 to judge whether the termination condition is met according to the updated comprehensive landscape visibility value and the initial comprehensive landscape visibility value, if so, the adjusted building data is used as the urban landscape sight optimization design scheme, if not, executing step S2.

[0049] Functions and Effects of the Embodiments

[0050] According to the urban landscape visibility assessment method and application involved in this embodiment, on the one hand, a corresponding model is constructed according to the urban architectural landscape data and the building viewpoint, street viewpoint and landscape viewpoint are set, the urban model is divided into grid plots, and the building viewpoint and landscape viewpoint and street viewpoint and landscape viewpoint are used for calculation, so as to obtain the comprehensive landscape visibility value of the entire city; on the other hand, some building data in the urban architectural landscape data are adjusted to generate an updated comprehensive landscape visibility value, and compared with the initial comprehensive landscape visibility value corresponding to the original urban architectural landscape data, so as to confirm whether the adjusted data has optimized the urban landscape sight, and then generate an urban landscape sight optimization design plan by dynamically adjusting the building data. In short, this method can evaluate the comprehensive landscape visibility value of the city, and dynamically adjust the building data according to the comprehensive landscape visibility value to generate an urban landscape sight optimization design plan.

[0051] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for evaluating urban landscape visibility, for obtaining a comprehensive landscape visibility value based on urban building landscape data and pedestrian flow data, characterized in that: The following steps are involved: A model building step, building a city model and a landscape model corresponding to at least one designated landscape according to the city building landscape data; A landscape point setting step, selecting a plurality of points in each of the landscape models as landscape points; A building viewpoint setting step, setting corresponding points for each building in the city model as building viewpoints; a street viewpoint setting step, in the city model, selecting n streets with the highest pedestrian and vehicle traffic density as main streets according to the pedestrian flow data, and selecting multiple points in each of the main streets as street viewpoints; A grid division step, dividing the city model into a plurality of grid plots; A landscape visibility value calculation step, for each of the grid plots, according to whether there is any obstruction between the lines connecting each of the building viewpoints and the street viewpoints in the grid plot and each of the landscape points, calculates the landscape visibility value of the grid plot; The comprehensive landscape visibility value calculation step is to calculate the comprehensive landscape visibility value of the city according to the landscape visibility values ​​of all the grid plots.

2. The urban landscape visibility assessment method according to claim 1, characterized in that: in, In the landscape visibility value calculation step, it is determined whether there is any obstruction on the line between the building viewpoint and the landscape point. If so, the visibility value between the building corresponding to the building viewpoint and the designated landscape corresponding to the landscape point is set to 1; if not, the visibility value is set to 0. Determine whether there is any obstruction on the line between the street viewpoint and the landscape point. If so, set the visibility value between the main street corresponding to the street viewpoint and the designated landscape corresponding to the landscape point to 1; if not, set the visibility value to 0. The landscape visibility value of the grid plot is the sum of the visibility values ​​corresponding to all the buildings and the main streets in the grid plot. In the comprehensive landscape visibility value calculation step, the comprehensive landscape visibility value is the sum of all the landscape visibility values.

3. The urban landscape visibility assessment method according to claim 1, characterized in that: in, The designated landscapes include landscape mountains and landscape waterways. For the landscape model corresponding to the landscape mountain, the points on a plurality of different contour lines in the mountain are selected as the landscape points. For the landscape model corresponding to the landscape waterway, a plurality of points in the waterway are selected as the landscape points at fixed intervals.

4. The urban landscape visibility assessment method according to claim 1, characterized in that: in, The main street is divided according to fixed intervals to obtain a plurality of street viewpoints.

5. A method for optimizing the sight line of an urban landscape, used to obtain an optimized sight line design scheme for an urban landscape according to urban architectural landscape data and pedestrian flow data, characterized in that: The following steps are involved: Step S1, according to the urban building landscape data and the pedestrian flow data, using the urban landscape visibility evaluation method, calculate the comprehensive landscape visibility value corresponding to the city as the initial comprehensive landscape visibility value; Step S2, adjusting the building data in the urban building landscape data; Step S3, according to the urban building landscape data and the pedestrian flow data, using the urban landscape visibility assessment method, calculate the comprehensive landscape visibility value corresponding to the city as the updated comprehensive landscape visibility value; Step S4, judging whether the termination condition is met according to the updated comprehensive landscape visibility value and the initial comprehensive landscape visibility value, if so, taking the adjusted building data as the urban landscape sight optimization design scheme, if not, executing step S2, Wherein, the urban landscape visibility assessment method is the urban landscape visibility assessment method described in any one of claims 1 to 4.

6. The method for optimizing the urban landscape sight line design according to claim 5, characterized in that: in, The building data includes the density, height, bottom length, angle between the long side of the building and the designated landscape, projection length of the long side of the building on the designated landscape direction, and distance between the building viewpoint and the landscape point.

7. A device for optimizing the sight line of a city landscape, used to obtain an optimized sight line of a city landscape according to the urban building landscape data and the pedestrian flow data, characterized in that: include: An initial comprehensive landscape visibility value calculation module is used to calculate the comprehensive landscape visibility value corresponding to the city as the initial comprehensive landscape visibility value according to the urban building landscape data and the pedestrian flow data by using the urban landscape visibility evaluation method; An adjustment module, used for adjusting the building data in the urban building landscape data; An updating module, configured to calculate the comprehensive landscape visibility value corresponding to the city according to the urban building landscape data and the pedestrian flow data and adopt the urban landscape visibility evaluation method to obtain the updated comprehensive landscape visibility value; A judgment module is used to judge whether the termination condition is met according to the updated comprehensive landscape visibility value and the initial comprehensive landscape visibility value. If so, the adjusted building data is used as the urban landscape sight optimization design scheme; if not, the adjustment module is controlled to run. Wherein, the urban landscape visibility assessment method is the urban landscape visibility assessment method described in any one of claims 1 to 4.

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