A monitoring method and system for mitigating heat island effects in ecological corridors

Abstract

This application provides a method and system for monitoring the heat island mitigation function of ecological corridors. The method includes acquiring remote sensing images of a monitoring area, which includes a target ecological corridor and several buildings in a buffer zone adjacent to the target ecological corridor; calculating an openness index, an aspect ratio index, a vegetation enhancement index, and a building density index; weighting and summing these indices to obtain a comprehensive heat island mitigation function index for the target ecological corridor; and issuing an alarm when the comprehensive heat island mitigation function index is less than a preset threshold. This application, by acquiring and analyzing remote sensing images covering the target ecological corridor and its adjacent buffer zones within the monitoring area, can effectively improve the efficiency and accuracy of monitoring the heat island mitigation function of ecological corridors.

Description

Technical Field

[0001] This application relates to the field of geographic information technology, and in particular to a method and system for monitoring the mitigation function of heat islands in ecological corridors. Background Technology

[0002] In densely populated, highly urbanized areas, the urban heat island effect gradually alters the urban thermal and wind environments, impacting regional climate, hydrology, air quality, soil, biological distribution, and numerous urban ecological processes. For cities, large ecological patches connected by ecological corridors serve as important urban cooling sources, playing a crucial role in mitigating the urban heat island effect. Therefore, the construction of ecological corridors is of great significance in mitigating the urban heat island effect.

[0003] Currently, existing methods for monitoring the heat island mitigation function of ecological corridors mainly rely on manual sampling. In highly urbanized and densely populated areas, ecological corridors are often widely distributed and have complex environments. Manual sampling needs to cover all key areas to ensure the comprehensiveness and representativeness of the data. However, in practice, due to limited human resources, sampling points often only cover part of the monitoring area, making it impossible to accurately monitor the mitigation effect of ecological corridors on the heat island effect. Furthermore, the process of manual sampling and data processing is cumbersome and time-consuming, resulting in low efficiency in monitoring the heat island mitigation function of ecological corridors. Summary of the Invention

[0004] This application addresses the problems in the prior art by providing a method and system for monitoring the heat island mitigation function of ecological corridors. This method and system can effectively improve the efficiency and accuracy of monitoring the heat island mitigation function of ecological corridors by acquiring and analyzing remote sensing images covering the target ecological corridor and its adjacent buffer interface in the monitoring area.

[0005] A method for monitoring the heat island mitigation function of ecological corridors, comprising:

[0006] Acquire remote sensing images of a monitored area, which includes a target ecological corridor and several buildings in a buffer zone adjacent to the target ecological corridor;

[0007] Based on the remote sensing image and the length of the target ecological corridor, and using a preset openness index model, the impact of the building on the openness of the target ecological corridor is analyzed to obtain the openness index.

[0008] Based on the remote sensing image, the width of the target ecological corridor, and the height of the building, the height-to-width ratio index of the building and the target ecological corridor is calculated according to a preset aspect ratio model.

[0009] Based on the remote sensing imagery and a preset enhanced vegetation index calculation formula, the urban green volume of the buffer interface is analyzed to obtain the enhanced vegetation index.

[0010] Calculate the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface;

[0011] The heat island mitigation function comprehensive index of the target ecological corridor is obtained by weighted summation of the openness index, height-to-width ratio index, enhanced vegetation index and building density index respectively.

[0012] When the comprehensive index of heat island mitigation function is less than the preset threshold of comprehensive index of heat island mitigation function, an alarm message is issued.

[0013] This application also provides a monitoring system for mitigating the urban heat island effect in ecological corridors, including:

[0014] Data acquisition module: used to acquire remote sensing images of the monitored area, which includes the target ecological corridor and several buildings in the buffer interface adjacent to the target ecological corridor;

[0015] Openness index acquisition module: Based on the remote sensing image and the length of the target ecological corridor, and using a preset openness index model, analyze the impact of the building on the openness of the target ecological corridor to obtain the openness index;

[0016] Aspect Ratio Index Acquisition Module: Used to calculate the aspect ratio index of the building and the target ecological corridor based on the remote sensing image, the width of the target ecological corridor, and the height of the building, according to a preset aspect ratio model;

[0017] Enhanced vegetation index acquisition module: used to analyze the urban green volume of the buffer interface based on the remote sensing image and a preset enhanced vegetation index calculation formula to obtain the enhanced vegetation index;

[0018] Building density index acquisition module: used to calculate the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface;

[0019] The heat island mitigation function comprehensive index acquisition module is used to perform weighted summation on the openness index, height-to-width ratio index, enhanced vegetation index and building density index respectively to obtain the heat island mitigation function comprehensive index of the target ecological corridor.

[0020] Alarm module: When the comprehensive index of heat island mitigation function is less than the preset threshold of comprehensive index of heat island mitigation function, an alarm message is issued.

[0021] Compared to existing technologies, high-density buildings and other elements within cities impede wind flow after it enters the city, causing a sharp decrease in wind speed and significantly impacting the heat island mitigation function of ecological corridors. Therefore, this application acquires remote sensing images covering the target ecological corridor and its adjacent buffer zones within a monitoring area. Based on these images, it calculates the openness index of several buildings on the buffer zones adjacent to the target ecological corridor, the aspect ratio index of the buildings relative to the target ecological corridor, and the building density of the buffer zones. This allows for analysis of the degree of obstruction by surrounding buildings and the degree of wind penetration between surrounding buildings. Furthermore, by combining the calculation of the enhanced vegetation index of the buffer zones, the impact of the cooling effect of urban green space on the heat island mitigation function of the target ecological corridor is analyzed. This comprehensive approach to monitoring the heat island mitigation function of ecological corridors effectively improves the efficiency and accuracy of monitoring this function.

[0022] To provide a clearer understanding of this application, the specific embodiments of this application will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a flowchart of a method for monitoring the heat island mitigation function of an ecological corridor according to this application;

[0024] Figure 2 A flowchart of a method for calculating the openness index in a monitoring method for mitigating heat island effects in ecological corridors;

[0025] Figure 3 A flowchart illustrating a method for calculating building width in a monitoring approach for mitigating heat island effects in ecological corridors;

[0026] Figure 4 A schematic diagram illustrating the extraction of contour points of adjacent buildings in a monitoring method for mitigating heat island effects in ecological corridors.

[0027] Figure 5 A flowchart illustrating a method for acquiring two-dimensional vector data of buildings in a monitoring method for mitigating heat island effects in ecological corridors;

[0028] Figure 6 A flowchart illustrating the method for calculating the aspect ratio index in a monitoring approach for mitigating heat island effects in ecological corridors;

[0029] Figure 7 A flowchart of a method for calculating the building density index in a monitoring method for mitigating heat island effects in ecological corridors;

[0030] Figure 8 A flowchart of a method for calculating the comprehensive index of heat island mitigation function in a monitoring method for the heat island mitigation function of an ecological corridor;

[0031] Figure 9A flowchart illustrating the method for calculating weights in a monitoring approach for mitigating heat island effects in ecological corridors;

[0032] Figure 10 This is a schematic diagram of a monitoring system for mitigating heat islands in an ecological corridor, as described in this application. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] It should be understood that the illustrative drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed in order or performed simultaneously. Furthermore, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] Example 1

[0037] Please see Figure 1 , Figure 1 This is a flowchart illustrating a method for monitoring the mitigation function of an ecological corridor heat island, as described in this application. The method includes the following steps:

[0038] S1: Acquire remote sensing images of the monitored area, which includes the target ecological corridor and several buildings in the buffer interface adjacent to the target ecological corridor;

[0039] S2: Based on the remote sensing image and the length of the target ecological corridor, and using a preset openness index model, analyze the impact of the building on the openness of the target ecological corridor to obtain the openness index;

[0040] S3: Based on the remote sensing image, the width of the target ecological corridor, and the height of the building, calculate the height-to-width ratio index of the building and the target ecological corridor according to a preset aspect ratio model;

[0041] S4: Based on the remote sensing image and a preset enhanced vegetation index calculation formula, the urban green volume of the buffer interface is analyzed to obtain the enhanced vegetation index.

[0042] S5: Calculate the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface;

[0043] S6: The openness index, aspect ratio index, enhanced vegetation index and building density index are weighted and summed respectively to obtain the comprehensive index of the heat island mitigation function of the target ecological corridor;

[0044] S7: When the comprehensive index of heat island mitigation function is less than the preset threshold of comprehensive index of heat island mitigation function, an alarm message is issued.

[0045] Compared to existing technologies, high-density buildings and other elements within cities impede wind flow after it enters the city, causing a sharp decrease in wind speed and significantly impacting the heat island mitigation function of ecological corridors. Therefore, this solution acquires remote sensing images covering the target ecological corridor and its adjacent buffer zones within a monitoring area. Based on these images, it calculates the openness index of several buildings on the buffer zones, the aspect ratio index of the buildings relative to the target ecological corridor, and the building density of the buffer zones. This allows for analysis of the degree of obstruction by surrounding buildings and the degree of wind penetration between them. Furthermore, it incorporates the enhanced vegetation index of the buffer zones to consider the impact of urban green space on the heat island mitigation function of the target ecological corridor. In other words, by jointly monitoring the heat island mitigation function of ecological corridors using openness index, enhanced vegetation index, aspect ratio index, and building density index, the efficiency and accuracy of monitoring the heat island mitigation function of ecological corridors can be effectively improved.

[0046] The ecological corridor heat island mitigation function monitoring method of the present invention can be executed by the following computer system, which includes an ecological corridor monitoring database server, a data acquisition server, and an ecological corridor monitoring server. The ecological corridor monitoring database server is used to store remote sensing images of the monitoring area, information such as the length, width, and area of ​​the target ecological corridor, and information such as the height and base area of ​​each building in the buffer interface, thereby constructing the ecological corridor monitoring database.

[0047] The data acquisition server is used to obtain remote sensing images of the monitoring area, the length, width and area of ​​the target ecological corridor, and the height and base area of ​​each building in the buffer interface from the ecological corridor monitoring database server, and send them to the ecological corridor monitoring server for processing.

[0048] The ecological corridor monitoring server executes the ecological corridor heat island mitigation function monitoring method of the present invention. Based on remote sensing imagery, information such as the length, width, and area of ​​the target ecological corridor, and information such as the height and base area of ​​each building in the buffer interface, it calculates the openness index, vegetation enhancement index, aspect ratio index, and building density index, and performs a weighted summation to obtain the comprehensive heat island mitigation function index of the target ecological corridor. When the comprehensive heat island mitigation function index is less than a preset threshold, an alarm message or adjustment instruction is sent to the urban management department or urban planning department. The adjustment instruction is used to instruct adjustments to the building layout of the monitored area until the comprehensive heat island mitigation function index is greater than the threshold.

[0049] In step S1, in this embodiment, in response to the ecological corridor monitoring server's call instruction to the ecological corridor monitoring database server, remote sensing images of the monitored area are obtained from the ecological corridor monitoring database server. The monitored area includes a target ecological corridor and several buildings within a buffer zone adjacent to the target ecological corridor. The target ecological corridor is a corridor area with specific ecological functions and service value, such as a passage connecting different ecological areas or a key area for protecting biodiversity. The buffer zone is a transitional zone established around the target ecological corridor to reduce human interference with the target ecological corridor and protect its ecological functions.

[0050] In this embodiment, a buffer zone with a width of 1 kilometer is established around the target ecological corridor to form a continuous transition area. The transition area can be annular or strip-shaped, depending on the shape of the target ecological corridor. The buffer zone contains several buildings, and information such as the height and base area of ​​each building can be obtained from urban planning or construction management departments.

[0051] Of course, in other embodiments, the width of the buffer interface can be adaptively modified according to the actual monitoring needs of the ecological corridor.

[0052] For step S2, the openness index model is a mathematical model used to quantitatively analyze the openness of a specific area, such as the target ecological corridor. The openness index measures the degree of openness or permeability between the target ecological corridor and the buffer interface, especially the buildings within the buffer interface. The larger the openness index, the less obstruction the target ecological corridor is caused by the buildings within the buffer interface, and the better the heat island mitigation effect of the target ecological corridor.

[0053] In this embodiment, please refer to Figure 2 , Figure 2 This is a flowchart illustrating a method for calculating an openness index in a monitoring approach for mitigating heat island effects in ecological corridors. The method involves analyzing the impact of buildings on the openness of the target ecological corridor based on the remote sensing imagery and the length of the target ecological corridor, using a pre-defined openness index model to obtain the openness index. The steps include:

[0054] S21: Filter the neighboring buildings that are directly adjacent to the target ecological corridor, and calculate the side length of the side of each neighboring building that is adjacent to the target ecological corridor based on the remote sensing image, as the building width of each neighboring building;

[0055] S22: Input the building widths of each of the adjacent buildings and the length of the target ecological corridor into the openness model to obtain the openness index:

[0056]

[0057] Where F is the openness index, A i Let be the width of the i-th neighboring building, and n be the total number of neighboring buildings.

[0058] For step S21, the building has multiple sides. In order to analyze the most direct physical obstruction or impact of the building on the target ecological corridor, the side length of the side of each building within 100 meters of the target ecological corridor in the buffer interface that is most directly adjacent to the target ecological corridor is selected as the building width. Specifically, it is the side length of the side with the shortest distance between the building and the target ecological corridor.

[0059] In one embodiment, see Figure 3 and Figure 4 , Figure 3 This is a flowchart illustrating a method for calculating building width in a monitoring approach for mitigating heat island effects in ecological corridors. Figure 4This is a schematic diagram illustrating the extraction of contour points of adjacent buildings in a method for monitoring the mitigation function of an ecological corridor heat island. The step of calculating the side length of the adjacent building adjacent to the target ecological corridor based on the remote sensing image, as the building width of each adjacent building, further includes:

[0060] S211: Based on the remote sensing image, extract the outlines of the adjacent buildings and the target ecological corridor on the remote sensing image, and convert them into vector data to obtain two-dimensional vector data of the buildings;

[0061] S212: Based on the two-dimensional vector data of the buildings, extract the boundary outlines of each of the adjacent buildings, as well as the boundary outlines of the target ecological corridor adjacent to the buffer interface.

[0062] S213: Based on the preset contour point spacing, generate a number of contour points on the boundary contour line of the adjacent building.

[0063] S214: Filter the contour points that are closest to the boundary contour line of the ecological corridor, and determine the boundary contour line of the side of the adjacent building that is adjacent to the target ecological corridor;

[0064] S215: The building width of each of the adjacent buildings is obtained by multiplying the total number of contour points on the boundary contour line of the side adjacent to the target ecological corridor by the contour point spacing, according to the following formula:

[0065] A i =m i ×d

[0066] Among them, A i The width of the adjacent building, in meters. i d represents the total number of contour points on the boundary contour line of the side of the adjacent building that is adjacent to the target ecological corridor, and d represents the spacing between the contour points.

[0067] For step S211, the remote sensing image is an image of the Earth's surface information acquired through remote sensing technology, such as sensors mounted on platforms like satellites and aircraft. The two-dimensional vector data of the building is vector data describing the outline of the building, typically including geometric information such as the building's boundaries and vertices.

[0068] Before extracting the outlines of the nearby buildings and the target ecological corridor on the remote sensing image, the process also includes preprocessing the remote sensing image, specifically performing geometric and radiometric corrections and enhancing contrast.

[0069] Please also refer to Figure 5 , Figure 5This is a flowchart illustrating a method for acquiring two-dimensional vector data of buildings in a monitoring method for mitigating the heat island effect of an ecological corridor. The step involves extracting the contours of adjacent buildings and the target ecological corridor from the remote sensing image and converting them into vector data to obtain the two-dimensional vector data of the buildings.

[0070] S211a: Identify edge features in the remote sensing image based on an edge detection algorithm;

[0071] S211b: Based on the contour tracking algorithm, continuous edge lines are extracted from the edge features to form the contours of buildings and target ecological corridors;

[0072] S211c: Convert the outlines of the building and the target ecological corridor into vector data format to obtain the two-dimensional vector data of the building.

[0073] For S211a-S211c, the edge detection algorithm can be Obel, Canny, or other edge detection algorithms. The vector data format can be Shapefile, GeoJSON, or other formats. After converting the outlines of the buildings and target ecological corridors into vector data format, smoothing processing can be performed to reduce jagged edges introduced by the edge detection algorithm; ensure the topological correctness of the vectorized data, such as checking for overlapping, broken, or discontinuous outlines; and manually check the vectorization results to correct possible errors or omissions.

[0074] For steps S212-S215, the boundary outlines of buildings and ecological corridors can be extracted using tools such as "Feature to Polygon" or "Feature Outline" in ArcGIS software. Using tools such as "Create Feature" or "Generate Points Along Line" in ArcGIS software, several outline points can be generated on the boundary outlines. The "Nearest Neighbor Analysis" function in ArcGIS software is used to filter the outline points closest to the boundary outline of the target ecological corridor, obtaining the total number of nearest outline points. Finally, the total number of outline points on the boundary outline of the side of the adjacent building adjacent to the target ecological corridor is multiplied by the outline point spacing to obtain the building width of each adjacent building.

[0075] The spacing between the outline points can be set to 1 meter or 5 meters, etc. Of course, in other embodiments, the spacing between the outline points can be adjusted adaptively according to the actual size of the building. The smaller the spacing between the outline points, the higher the accuracy of the calculated width of the building.

[0076] For step S22, for large-scale areas such as cross-province or cross-city target ecological corridors, their extension range is wide and their shape is complex, and directly measuring their length is inefficient. In this regard, the perimeter of the target ecological corridor can be obtained from urban planning departments and other channels, and half of the perimeter of the target ecological corridor can be used as the length of the target ecological corridor.

[0077] For target ecological corridors in small-scale areas such as urban parks and green spaces, their shape and scale are relatively simple. The length of the target ecological corridor can be calculated by referring to the above steps S212-S215. The difference is that a number of contour points are generated on the boundary contour line of the target ecological corridor with a preset contour point spacing, so as to calculate the length of the target ecological corridor. The specific details will not be elaborated further.

[0078] In this embodiment, for step S3, the remote sensing image is a MODIS remote sensing image containing spectral reflectance of specific bands, wherein the specific bands include the near-infrared band, the red band, and the blue band. The higher the enhanced vegetation index, the more lush the vegetation in the buffer interface. On the one hand, the transpiration of the vegetation enhances the cooling effect of the buffer interface; on the other hand, the shading effect of the vegetation effectively reduces the amount of solar radiation received by the surface, lowering the surface temperature. Therefore, it can effectively improve the heat island mitigation function of the ecological corridor.

[0079] The step involves analyzing the urban green volume of the buffer interface based on the remote sensing image and a preset enhanced vegetation index calculation formula to obtain the enhanced vegetation index, including:

[0080] Based on the spectral reflectance of the near-infrared, red, and blue light bands, the enhanced vegetation index is obtained according to the enhanced vegetation index calculation formula, which is as follows:

[0081]

[0082] Wherein, EVI is the enhanced vegetation index, G is a preset enhancement parameter for enhancing EVI, which can be set to 2.5, NIR is the spectral reflectance of the near-infrared band, R is the spectral reflectance of the red band, B is the spectral reflectance of the blue band, and C1 and C2 are both preset first and second atmospheric drag coefficients, which can be set to 6.0 and 7.5 respectively. Of course, in other embodiments, the enhancement parameter, the first atmospheric drag coefficient, and the second atmospheric drag coefficient can be adaptively adjusted.

[0083] In one embodiment, for step S4, the openness index model is a mathematical model used to quantitatively analyze the openness of a specific area, such as the target ecological corridor. The buffer interface includes a first buffer interface and a second buffer interface located on both sides of the target ecological corridor. The height-to-width ratio index refers to the ratio of the height of the building closest to the target ecological corridor on the first and second buffer interfaces to the width of the target ecological corridor, used to reflect the degree of influence of the building on the target ecological corridor. Specifically, the smaller the height-to-width ratio index, the smaller the wind flow resistance in the target ecological corridor, and the better the heat island mitigation effect of the target ecological corridor.

[0084] Please see Figure 6 , Figure 6 This is a flowchart illustrating a method for calculating the aspect ratio index in a monitoring method for mitigating the heat island effect of an ecological corridor. The step of calculating the aspect ratio index between the building and the target ecological corridor based on the remote sensing image, the width of the target ecological corridor, and the height of the building, using a preset aspect ratio model, includes:

[0085] S41: Based on the remote sensing image, calculate the distance between each building and the boundary outline of the target ecological corridor, and determine the first nearest neighbor building and the second nearest neighbor building that are closest to the target ecological corridor in the first buffer interface and the second buffer interface, respectively.

[0086] S42: Based on the width of the target ecological corridor and the building heights of the first and second nearest buildings, the height-to-width ratio index is obtained using the height-to-width ratio model. The calculation formula for the height-to-width ratio model is as follows:

[0087]

[0088] Where E is the aspect ratio index, H1 and H2 are the building heights of the first and second nearest buildings, respectively, and D is the width of the ecological corridor.

[0089] For step S41, the first nearest building and the second nearest building are determined from the buildings within 100 meters of the target ecological corridor from the first buffer interface and the second buffer interface.

[0090] The principle of calculating the distance between each building and the boundary outline of the target ecological corridor based on the remote sensing image, and determining the first and second nearest buildings closest to the target ecological corridor in the first and second buffer interfaces respectively, can be referred to in steps S211-S214 above. The difference is that step S41 is to determine the building closest to the target ecological corridor, which will not be elaborated further.

[0091] For step S42, the width of the target ecological corridor is the average width, which can be obtained directly from channels such as urban planning departments. Alternatively, the area and length of the target ecological corridor can be obtained from channels such as urban planning departments, and the average width can be obtained by dividing the area of ​​the target ecological corridor by the length.

[0092] For step S5, the building density index refers to the ratio of the base area of ​​the building within the buffer interface to the total area of ​​the buffer interface. It is also used to measure the degree of influence of the building on the target ecological corridor. Specifically, the smaller the building density index, the higher the air ventilation efficiency of the target ecological corridor, and the better the heat island mitigation effect of the target ecological corridor.

[0093] In this embodiment, please refer to Figure 7 , Figure 7 This is a flowchart illustrating a method for calculating the building density index in a monitoring approach for mitigating urban heat islands in ecological corridors. The step of calculating the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface includes:

[0094] S51: Divide the buffer interface into several buffer cells, wherein the sum of the areas of all the buffer cells is equal to the area of ​​the buffer interface;

[0095] S52: The base areas of each building in the buffer cell are summed to obtain the total base area of ​​the buffer cell;

[0096] S53: Divide the total area of ​​the base by the area of ​​the buffer cell to obtain the building density index of the buffer cell;

[0097] S54: Calculate the arithmetic average of the building density indices of each buffer cell to obtain the building density index of the buffer interface.

[0098] For steps S51-S54, geographic information system software such as ArcGIS can be used to divide the buffer interface into rectangular or square cells of equal area, or to make irregular divisions according to the terrain.

[0099] In this embodiment, for the buffer interface with a width of 1 km, combined with the length of the target ecological corridor, the area of ​​the buffer interface can be obtained, and it is preferentially divided into several square buffer cells with a size of 100*100m. The base area of ​​each building in each square buffer cell is summed to obtain the total base area of ​​the square buffer cell, and then divided by the area of ​​the square buffer cell to obtain the building density index of the square buffer cell. Finally, the building density indices of all the square buffer cells are calculated by arithmetic mean to obtain the building density index of the buffer interface.

[0100] Of course, in other embodiments, the area setting of the buffer cell can be adjusted according to the actual size of the buffer interface.

[0101] For step S6, the comprehensive index for mitigating the urban heat island effect is a comprehensive index obtained by weighted summation of multiple related indices (such as enhanced vegetation index, openness index, height-to-width ratio index, and building density index), which is used to quantitatively analyze the overall effectiveness of the target ecological corridor in mitigating the urban heat island effect.

[0102] In one embodiment, see Figure 8 , Figure 8 This is a flowchart illustrating a method for calculating a comprehensive index of heat island mitigation function in an ecological corridor heat island mitigation function monitoring method. The method involves weighted summation of the openness index, aspect ratio index, enhanced vegetation index, and building density index to obtain the comprehensive index of the target ecological corridor's heat island mitigation function, including:

[0103] S61: Based on the preset mapping relationships for openness index, aspect ratio index, enhanced vegetation index, and building density index, assign values ​​to the openness index, aspect ratio index, enhanced vegetation index, and building density index respectively to obtain the assigned values ​​for openness index, aspect ratio index, enhanced vegetation index, and building density index.

[0104] S62: The comprehensive index for mitigating the urban heat island effect is obtained by weighted summing the values ​​of the openness index, aspect ratio index, enhanced vegetation index, and building density index according to the following formula:

[0105]

[0106] Wherein, R is the comprehensive index of the heat island mitigation function of the target ecological corridor, Yi is the value assigned to the i-th index, and the index assignment includes: the openness index assignment, the height-to-width ratio index assignment, the enhanced vegetation index assignment, and the building density index assignment, K iThe weight of the i-th indicator includes the weight of the openness index, the weight of the aspect ratio index, the weight of the enhanced vegetation index, and the weight of the building density index, where n is the number of values ​​assigned to the indicator or the number of indicator weights.

[0107] For step S61, the mapping relationships for the enhanced vegetation index, the openness index, the aspect ratio index, and the building density index can be shown in Table 1.

[0108] Table 1:

[0109]

[0110]

[0111] In other embodiments, the mapping relationships for the enhanced vegetation index, openness index, aspect ratio index, and building density index can be adaptively adjusted according to actual needs, specifically by adjusting the value classification and corresponding assignments.

[0112] For step S62, the larger the comprehensive index of heat island mitigation function, the better the heat island mitigation function of the target ecological corridor.

[0113] In another embodiment, please also refer to Figure 9 , Figure 9 This is a flowchart illustrating the method for calculating weights in a monitoring approach for mitigating urban heat islands in ecological corridors. The calculation of the weights for the openness index, aspect ratio index, enhanced vegetation index, and building density index includes the following steps:

[0114] S621: Obtain several sample assignment sets, wherein each sample assignment set includes openness index sample assignment, aspect ratio index sample assignment, enhanced vegetation index sample assignment, and building density index sample assignment.

[0115] S622: Calculate the following probability values ​​for the openness index, aspect ratio index, enhanced vegetation index, and building density index samples under each of the aforementioned sample assignment sets:

[0116]

[0117] Where, p ij X is the probability value assigned to the j-th indicator within the i-th sample assignment set. The probability values ​​of these indicators include: the probability value assigned to the openness index, the probability value assigned to the aspect ratio index, the probability value assigned to the enhanced vegetation index, and the probability value assigned to the building density index. ijAssign a value to the j-th indicator under the i-th sample assignment set. The assignment of the indicator includes: openness index sample assignment, height-to-width ratio index sample assignment, enhanced vegetation index sample assignment, and building density index sample assignment; m is the number of the sample assignment sets.

[0118] S623: Based on the assigned probability values ​​of the openness index, aspect ratio index, enhanced vegetation index, and building density index samples under each of the aforementioned sample assignment sets, calculate the assigned entropy values ​​of the openness index, aspect ratio index, enhanced vegetation index, and building density index samples according to the following formulas:

[0119]

[0120] Among them, e j Let p be the entropy value of the j-th indicator, where the entropy value of the indicator includes the entropy values ​​assigned to the openness index sample, the aspect ratio index sample, the enhanced vegetation index sample, and the building density index sample, respectively. ij The probability value of the j-th indicator under the i-th sample assignment set is given. The probability values ​​of the indicators include: the sample assignment probability value of the openness index, the sample assignment probability value of the aspect ratio index, the sample assignment probability value of the enhanced vegetation index, and the sample assignment probability value of the building density index. m is the number of the sample assignment sets.

[0121] S624: Based on the assigned entropy values ​​of the openness index sample, the aspect ratio index sample, the enhanced vegetation index sample, and the building density index sample, calculate the weights of the openness index, aspect ratio index, enhanced vegetation index, and building density index according to the following formulas:

[0122]

[0123] Among them, K j Let e ​​be the weight of the j-th indicator, where the weights of the indicators include the weights of the openness index, the aspect ratio index, the enhanced vegetation index, and the building density index. j Let be the entropy value of the j-th indicator. The entropy value of the indicator includes the entropy value assigned to the openness index sample, the entropy value assigned to the aspect ratio index sample, the entropy value assigned to the enhanced vegetation index sample, and the entropy value assigned to the building density index sample.

[0124] For step S621, different ecological corridors can be selected to calculate the corresponding enhanced vegetation index, openness index, aspect ratio index, and building density index. The weights of the corresponding openness index, aspect ratio index, enhanced vegetation index, and building density index can be obtained according to the above-mentioned assignment mapping relationships of enhanced vegetation index, openness index, aspect ratio index, and building density index, thereby obtaining the several sample assignment sets.

[0125] For step S7, the comprehensive index threshold for heat island mitigation can be set to 1. When the comprehensive index for heat island mitigation is less than the preset threshold, an alarm message is sent to the urban management department or urban planning department. Of course, in other embodiments, the comprehensive index threshold for heat island mitigation can be modified adaptively.

[0126] In this embodiment, the alarm information is specifically an adjustment instruction, which instructs the adjustment of the building layout in the monitored area until the comprehensive heat island mitigation function index is greater than the threshold value. For example, by demolishing some unnecessary buildings in the buffer interface or increasing the distance between buildings during reconstruction, and by limiting the height of buildings, airflow can be increased, which is beneficial for heat dissipation, thereby improving the openness index, building density index, and height-to-width ratio index. Adding green vegetation, such as trees, shrubs, and lawns, to the open spaces between buildings, building roofs, and walls in the buffer interface increases vegetation coverage, thereby enhancing the vegetation index. Through these adjustments, the comprehensive heat island mitigation function index is effectively improved, contributing to the mitigation of the urban heat island effect.

[0127] Example 2

[0128] Please see Figure 10 , Figure 10 This is a schematic diagram of a monitoring system for mitigating heat islands in an ecological corridor, as described in this application.

[0129] This application also provides a monitoring system for mitigating the urban heat island effect in ecological corridors, including:

[0130] Data acquisition module 1: used to acquire remote sensing images of the monitored area, which includes the target ecological corridor and several buildings in the buffer interface adjacent to the target ecological corridor;

[0131] Openness Index Acquisition Module 2: Based on the remote sensing image and the length of the target ecological corridor, and using a preset openness index model, the module analyzes the impact of the building on the openness of the target ecological corridor to obtain the openness index.

[0132] Aspect Ratio Index Acquisition Module 3: Used to calculate the aspect ratio index of the building and the target ecological corridor based on the remote sensing image, the width of the target ecological corridor and the height of the building, and a preset aspect ratio model;

[0133] Enhanced vegetation index acquisition module 4: is used to analyze the urban green volume of the buffer interface based on the remote sensing image and a preset enhanced vegetation index calculation formula to obtain the enhanced vegetation index.

[0134] Building density index acquisition module 5: used to calculate the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface;

[0135] Heat island mitigation function comprehensive index acquisition module 6: used to perform weighted summation of the openness index, height-to-width ratio index, enhanced vegetation index and building density index respectively to obtain the heat island mitigation function comprehensive index of the target ecological corridor;

[0136] Alarm module 7: When the comprehensive index of the heat island mitigation function is less than the preset threshold of the comprehensive index of the heat island mitigation function, an alarm message is issued.

[0137] It should be noted that the data obtained by the monitoring system for mitigating the heat island function of the ecological corridor provided in this application during the implementation of the monitoring method for mitigating the heat island function of the ecological corridor are stored in the storage of this system in a one-to-one correspondence. When relevant calculations are required, the data required for the calculation can be directly obtained from the storage.

[0138] It should also be noted that the ecological corridor heat island mitigation function monitoring system provided in the above embodiments is only illustrated by the division of the above functional modules when implementing an ecological corridor heat island mitigation function monitoring method. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the equipment can be divided into different functional modules to complete all or part of the functions described above. In addition, the ecological corridor heat island mitigation function monitoring system provided in the above embodiments and the ecological corridor heat island mitigation function monitoring method in Embodiment 1 belong to the same concept, and the implementation process is detailed in the method embodiment, which will not be repeated here.

[0139] Based on the same inventive concept, this application also provides an electronic device, which may be a server, a desktop computing device, or a mobile computing device (e.g., a laptop computing device, a handheld computing device, a tablet computer, a netbook, etc.). The device includes one or more processors and a memory, wherein the processor is used to execute a program to implement the aforementioned monitoring method for mitigating heat islands in ecological corridors; and the memory is used to store computer programs executable by the processor.

[0140] This application is not limited to the above-described embodiments. If any modifications or variations to this application do not depart from the spirit and scope of this application, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this application, then this application also intends to include such modifications and variations.

Claims

1. A method for monitoring the heat island mitigation function of ecological corridors, characterized in that, Includes the following steps: Acquire remote sensing images of a monitored area, which includes a target ecological corridor and several buildings in a buffer zone adjacent to the target ecological corridor; Based on the remote sensing imagery and the length of the target ecological corridor, and using a pre-defined openness index model, the influence of the buildings on the openness of the target ecological corridor is analyzed to obtain an openness index. This includes: selecting neighboring buildings directly adjacent to the target ecological corridor, and calculating the side length of each neighboring building adjacent to the target ecological corridor based on the remote sensing imagery, using this as the building width of each neighboring building; inputting the building width of each neighboring building and the length of the target ecological corridor into the openness index model to obtain the openness index. Where F is the openness index, A i Let be the width of the i-th adjacent building, and n be the total number of adjacent buildings; Based on the remote sensing image, the width of the target ecological corridor, and the height of the building, the height-to-width ratio index of the building and the target ecological corridor is calculated according to a preset aspect ratio model. Based on the remote sensing image, and using a preset enhanced vegetation index calculation formula, the urban green area of ​​the buffer interface is analyzed to obtain an enhanced vegetation index. This includes: the remote sensing image is a MODIS remote sensing image containing spectral reflectance of specific bands, including near-infrared, red, and blue bands; the analysis of the urban green area of ​​the buffer interface based on the remote sensing image and the preset enhanced vegetation index calculation formula to obtain the enhanced vegetation index includes: obtaining the enhanced vegetation index based on the spectral reflectance of the near-infrared, red, and blue bands according to the enhanced vegetation index calculation formula, whereby the enhanced vegetation index calculation formula is: Wherein, EVI is the enhanced vegetation index, G is a preset enhancement parameter for enhancing EVI, NIR is the spectral reflectance of the near-infrared band, R is the spectral reflectance of the red band, B is the spectral reflectance of the blue band, and C1 and C2 are both preset first and second atmospheric drag coefficients. Calculate the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface; The heat island mitigation function comprehensive index of the target ecological corridor is obtained by weighted summation of the openness index, height-to-width ratio index, enhanced vegetation index and building density index respectively. When the comprehensive index of heat island mitigation function is less than the preset threshold of comprehensive index of heat island mitigation function, an alarm message is issued.

2. The method for monitoring the mitigation function of an ecological corridor heat island according to claim 1, characterized in that, The openness index, aspect ratio index, enhanced vegetation index, and building density index are weighted and summed to obtain the comprehensive index of the heat island mitigation function of the target ecological corridor, including: Based on the preset mapping relationships for openness index, aspect ratio index, enhanced vegetation index, and building density index, the openness index, aspect ratio index, enhanced vegetation index, and building density index are assigned values ​​respectively to obtain the openness index, aspect ratio index, enhanced vegetation index, and building density index values. The comprehensive index for mitigating the urban heat island effect is obtained by weighted summing the values ​​assigned to the openness index, aspect ratio index, enhanced vegetation index, and building density index according to the following formula: Where R is the comprehensive index of heat island mitigation function, and Y i Assign values ​​to the i-th indicator, including: the openness index, the aspect ratio index, the enhanced vegetation index, and the building density index, K. i The weight of the i-th indicator includes the weight of the openness index, the weight of the aspect ratio index, the weight of the enhanced vegetation index, and the weight of the building density index, where n is the number of values ​​assigned to the indicator or the number of indicator weights.

3. The method for monitoring the mitigation function of an ecological corridor heat island according to claim 2, characterized in that, Calculating the weights of the openness index, aspect ratio index, enhanced vegetation index, and building density index includes the following steps: Obtain several sample assignment sets, wherein each sample assignment set includes openness index sample assignments, aspect ratio index sample assignments, enhanced vegetation index sample assignments, and building density index sample assignments; Calculate the following probability values ​​for the openness index, aspect ratio index, enhanced vegetation index, and building density index samples under each of the aforementioned sample assignment sets: Where, p ij X is the probability value assigned to the j-th indicator within the i-th sample assignment set. The probability values ​​of these indicators include: the probability value assigned to the openness index, the probability value assigned to the aspect ratio index, the probability value assigned to the enhanced vegetation index, and the probability value assigned to the building density index. ij Assign a value to the j-th indicator under the i-th sample assignment set. The assignment of the indicator includes: openness index sample assignment, height-to-width ratio index sample assignment, enhanced vegetation index sample assignment, and building density index sample assignment; m is the number of the sample assignment sets. Based on the assigned probability values ​​of the openness index, aspect ratio index, enhanced vegetation index, and building density index samples under each of the aforementioned sample assignment sets, the assigned entropy values ​​of the openness index, aspect ratio index, enhanced vegetation index, and building density index samples are calculated according to the following formulas: Among them, e j Let p be the entropy value of the j-th indicator, where the entropy value of the indicator includes the entropy values ​​assigned to the openness index sample, the aspect ratio index sample, the enhanced vegetation index sample, and the building density index sample, respectively. ij The probability value of the j-th indicator under the i-th sample assignment set is given. The probability values ​​of the indicators include: the sample assignment probability value of the openness index, the sample assignment probability value of the aspect ratio index, the sample assignment probability value of the enhanced vegetation index, and the sample assignment probability value of the building density index. m is the number of the sample assignment sets. Based on the entropy values ​​assigned to the openness index, aspect ratio index, enhanced vegetation index, and building density index samples, the weights of the openness index, aspect ratio index, enhanced vegetation index, and building density index are calculated using the following formulas: Among them, K j Let e ​​be the weight of the j-th indicator, where the weights of the indicators include the weights of the openness index, the aspect ratio index, the enhanced vegetation index, and the building density index. j Let be the entropy value of the j-th indicator. The entropy value of the indicator includes the entropy value assigned to the openness index sample, the entropy value assigned to the aspect ratio index sample, the entropy value assigned to the enhanced vegetation index sample, and the entropy value assigned to the building density index sample.

4. The method for monitoring the heat island mitigation function of an ecological corridor according to claim 1, characterized in that, The step of calculating the side length of the adjacent building adjacent to the target ecological corridor based on the remote sensing image, as the building width of each adjacent building, includes: Based on the remote sensing image, the outlines of the adjacent buildings and the target ecological corridor on the remote sensing image are extracted and converted into vector data to obtain two-dimensional vector data of the buildings. Based on the two-dimensional vector data of the buildings, the boundary outlines of each of the adjacent buildings, as well as the boundary outlines of the target ecological corridor adjacent to the buffer interface, are extracted. Based on the preset contour point spacing, a number of contour points are generated on the boundary contour line of the adjacent building. Filter the contour points that are closest to the boundary contour line of the ecological corridor to determine the boundary contour line of the side of the adjacent building that is adjacent to the target ecological corridor; The building width of each of the adjacent buildings is obtained by multiplying the total number of outline points on the boundary outline line of the side of the adjacent building adjacent to the target ecological corridor by the spacing between the outline points.

5. The method for monitoring the mitigation function of an ecological corridor heat island according to claim 4, characterized in that, The buffer interface includes a first buffer interface and a second buffer interface located on both sides of the target ecological corridor. The step of calculating the aspect ratio index of the building relative to the target ecological corridor based on the remote sensing image, the width of the target ecological corridor, and the height of the building, using a preset aspect ratio model, includes: Based on the remote sensing image, the distance between each building and the boundary outline of the target ecological corridor is calculated, and the first nearest neighbor building and the second nearest neighbor building that are closest to the target ecological corridor in the first buffer interface and the second buffer interface are determined respectively. Based on the width of the target ecological corridor and the building heights of the first and second nearest buildings, the height-to-width ratio index is obtained using the height-to-width ratio model. The calculation formula for the height-to-width ratio model is as follows: Where E is the aspect ratio index, H1 and H2 are the building heights of the first and second nearest buildings, respectively, and D is the width of the ecological corridor.

6. The method for monitoring the heat island mitigation function of an ecological corridor according to claim 1, characterized in that, The step of calculating the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface includes: The buffer interface is divided into several buffer cells, wherein the sum of the areas of all the buffer cells is equal to the area of ​​the buffer interface. The base areas of each building in the buffer cell are summed to obtain the total base area of ​​the buffer cell; Divide the total area of ​​the base by the area of ​​the buffer cell to obtain the building density index of the buffer cell; The building density index of the buffer interface is obtained by calculating the arithmetic average of the building density indices of each buffer cell.

7. The method for monitoring the mitigation function of an ecological corridor heat island according to claim 1, characterized in that, The alarm information is specifically an adjustment instruction, which is used to instruct the adjustment of the building layout in the monitored area until the comprehensive index of heat island mitigation function is greater than the threshold of the comprehensive index of heat island mitigation function.

8. A monitoring system for mitigating urban heat islands in ecological corridors, characterized in that, include: Data acquisition module: used to acquire remote sensing images of the monitored area, which includes the target ecological corridor and several buildings in the buffer interface adjacent to the target ecological corridor; Openness Index Acquisition Module: Based on the remote sensing image and the length of the target ecological corridor, and using a preset openness index model, this module analyzes the impact of buildings on the openness of the target ecological corridor to obtain an openness index. This includes: filtering adjacent buildings directly adjacent to the target ecological corridor; calculating the side length of each adjacent building adjacent to the target ecological corridor based on the remote sensing image, using this as the building width of each adjacent building; and inputting the building width of each adjacent building and the length of the target ecological corridor into the openness index model to obtain the openness index. Where F is the openness index, A i Let be the width of the i-th adjacent building, and n be the total number of adjacent buildings; Aspect Ratio Index Acquisition Module: Used to calculate the aspect ratio index of the building and the target ecological corridor based on the remote sensing image, the width of the target ecological corridor, and the height of the building, according to a preset aspect ratio model; Enhanced Vegetation Index Acquisition Module: Used to analyze the urban green volume of the buffer interface based on the remote sensing image and a preset enhanced vegetation index calculation formula to obtain the enhanced vegetation index. This includes: the remote sensing image is a MODIS remote sensing image containing spectral reflectance of specific bands, including near-infrared, red, and blue light bands; the analysis of the urban green volume of the buffer interface based on the remote sensing image and the preset enhanced vegetation index calculation formula to obtain the enhanced vegetation index includes: obtaining the enhanced vegetation index according to the spectral reflectance of the near-infrared, red, and blue light bands, and following the enhanced vegetation index calculation formula, whereby: Wherein, EVI is the enhanced vegetation index, G is a preset enhancement parameter for enhancing EVI, NIR is the spectral reflectance of the near-infrared band, R is the spectral reflectance of the red band, B is the spectral reflectance of the blue band, and C1 and C2 are both preset first and second atmospheric drag coefficients. Building density index acquisition module: used to calculate the building density index of the buffer interface based on the base area of ​​each building and the area of ​​the buffer interface; The heat island mitigation function comprehensive index acquisition module is used to perform weighted summation on the openness index, height-to-width ratio index, enhanced vegetation index and building density index respectively to obtain the heat island mitigation function comprehensive index of the target ecological corridor. Alarm module: When the comprehensive index of heat island mitigation function is less than the preset threshold of comprehensive index of heat island mitigation function, an alarm message is issued.

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