A screening method, device, equipment and medium for ecological clean small watershed construction

Abstract

The present application discloses a screening method, device, equipment and medium for the construction of ecologically clean small watersheds. The screening method for the construction of ecologically clean small watersheds includes: obtaining multiple small watersheds in the area to be screened; obtaining a residential population density raster map and a soil erosion intensity raster map of the area to be screened; according to the residential population density raster map and the soil erosion intensity raster map, respectively determining the number of residents and the amount of soil erosion in each small watershed, sorting the multiple small watersheds according to the construction demand, and screening out the target small watersheds. The present application screens according to the number of residents and the amount of soil erosion in each small watershed, and can more accurately screen out the small watersheds that should be given priority for construction.

Description

Technical Field

[0001] The present application relates to the technical field of ecological clean small watershed construction, and specifically to a screening method, device, equipment and medium for ecological clean small watershed construction. Background Art

[0002] In recent years, the construction of ecological clean small watersheds has received more and more attention from the scientific community. However, the existing selection of ecological clean small watershed construction scope mainly relies on qualitative judgments by relevant personnel based on soil and water loss conditions. The selection results are easily affected by personal experience accumulation and subjective factors, and do not quantitatively consider the impact of human activities and other aspects. Therefore, a selection method for ecological clean small watershed construction is needed to more objectively and accurately select the scope of ecological clean small watershed construction that should be given priority. Summary of the invention

[0003] The embodiments of the present application provide a screening method, device, equipment and medium for the construction of ecologically clean small watersheds, aiming to more accurately screen out small watersheds that should be constructed as a priority.

[0004] On the one hand, the present application provides a screening method for ecologically clean small watershed construction, the screening method for ecologically clean small watershed construction comprising:

[0005] Acquire multiple small watersheds in the area to be screened;

[0006] Obtain a residential population density grid map and a soil erosion intensity grid map of the area to be screened;

[0007] According to the residential population density grid map and the soil erosion intensity grid map, respectively determine the number of residents and the amount of soil erosion in each of the small watersheds, and sort the multiple small watersheds according to the construction demand, wherein the construction demand is determined based on the number of residents and the amount of soil erosion;

[0008] According to the sorting results, the target small watershed is screened out.

[0009] In some embodiments, the number of residents in the small watershed is determined by the following steps:

[0010] Obtaining the actual geographical extent of the micro-watershed;

[0011] Extending the actual geographical scope of the small watershed outward by a preset distance to obtain an expanded geographical scope of the small watershed;

[0012] In a plurality of grid cells of the residential population density grid map, the sum of the number of residential populations in the grid cells within the small watershed and its expanded geographical range is taken as the number of residential populations in the small watershed;

[0013] The residential population density grid map of the area to be screened is obtained by the following steps:

[0014] Obtaining the actual geographical scope of the area to be screened;

[0015] Extending the actual geographical scope of the area to be screened outward by a preset distance to obtain an expanded geographical scope of the area to be screened;

[0016] The residential population density grid map of the area to be screened and its expanded geographical range is used as the residential population density grid map of the area to be screened.

[0017] In some embodiments, the residential population density grid map of the to-be-screened area and its expanded geographic range is determined by the following steps:

[0018] For each of the grid cells in the area to be screened and its expanded geographical range, obtain the number of settlements, construction land area, cultivated land area and night light brightness value in the grid cell;

[0019] Determine the estimated proportion of the number of residents in the grid unit based on the number of settlements, the area of ​​construction land, the area of ​​cultivated land, and the night light brightness value;

[0020] Based on the estimated proportion, determining the number of residents in the grid cell;

[0021] According to the number of residents in the plurality of grid cells, a resident population density grid map of the area to be screened and its expanded geographical scope is generated.

[0022] In some embodiments, the soil erosion intensity grid map of the area to be screened is determined by the following steps:

[0023] For each grid cell in the actual geographical range of the area to be screened, obtaining the soil erosion modulus of the grid cell;

[0024] Determine the product of the soil erosion modulus of the grid cell and the area of ​​the grid cell to obtain the amount of soil and water loss of the grid cell;

[0025] Based on the amount of soil erosion in each grid cell, a grid map of soil erosion intensity in the area to be screened is generated.

[0026] In some embodiments, the construction demand of the small watershed is determined by the following steps:

[0027] Obtain the published relevant industry planning information of the area to be screened;

[0028] In the relevant industry planning information, the number of plans involving each of the small watersheds is determined respectively;

[0029] Based on the number of residents in each small watershed, the amount of soil erosion and the planned quantity, the construction demand of the small watershed is determined.

[0030] In some embodiments, determining the construction demand of each small watershed based on the number of residents, the amount of soil erosion, and the planned quantity in each small watershed includes:

[0031] For each of the small watersheds, determine the product of the number of residents in the small watershed, the amount of soil erosion, and the planned amount;

[0032] The product is used as the construction demand of the small watershed.

[0033] In some embodiments, the determining of the number of plans involving each of the small watersheds in the relevant industry planning information includes:

[0034] For each of the small watersheds, determining target planning information related to the small watershed in the relevant industry planning information;

[0035] Determine the type of involvement of each target planning information for the small watershed;

[0036] If the involvement type is indirect involvement, determining that the number of the target planning information involved in the small watershed is a first number;

[0037] If the involvement type is direct involvement, determining that the number of the target planning information involved in the small watershed is a second number, and the second number is greater than the first number;

[0038] Based on the number of small watersheds involved in all the target planning information, the number of plans involving the small watersheds is determined.

[0039] On the other hand, the embodiment of the present application provides a screening device for ecological clean small watershed construction, including:

[0040] The first acquisition module is used to acquire multiple small watersheds in the area to be screened;

[0041] The second acquisition module is used to obtain a residential population density grid map and a soil and water loss intensity grid map of the area to be screened;

[0042] A sorting and determining module, for determining the number of residents and the amount of soil and water loss in each of the small watersheds according to the residential population density grid map and the soil and water loss intensity grid map, and sorting the multiple small watersheds according to the construction demand, wherein the construction demand is determined based on the number of residents and the amount of soil and water loss;

[0043] The watershed screening module is used to screen out the target small watershed according to the sorting results.

[0044] On the other hand, the present application also provides a computer device, the computer device comprising:

[0045] one or more processors;

[0046] Memory; and

[0047] One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the steps in any one of the screening methods for constructing an ecologically clean small watershed.

[0048] On the other hand, the present application also provides a computer-readable storage medium having a computer program stored thereon, and the computer program is loaded by a processor to execute the steps in any of the screening methods for constructing an ecologically clean small watershed.

[0049] On the other hand, the present application also provides a computer program product, including a computer program or instructions, which are executed by a processor to implement the screening method for constructing an ecologically clean small watershed as described in any of the above items.

[0050] The embodiment of the present application provides a screening method, device, equipment and medium for the construction of ecological clean small watersheds. The embodiment of the present application obtains multiple small watersheds in the area to be screened, and obtains a residential population density grid map and a soil erosion intensity grid map of the area to be screened. According to the residential population density grid map and the soil erosion intensity grid map, the number of residents and the amount of soil erosion in each small watershed are determined respectively, and the multiple small watersheds are sorted according to the construction demand to screen out the target small watersheds, so that the small watersheds that should be constructed first can be screened out more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0052] Figure 1It is a schematic flow chart of an embodiment of a screening method for ecological clean small watershed construction provided in the embodiments of the present application;

[0053] Figure 2 It is another embodiment flow chart of the screening method for ecological clean small watershed construction provided in the embodiments of the present application;

[0054] Figure 3 This is a schematic diagram of an embodiment of extending the actual geographical scope of the area to be screened outward in the embodiment of the present application;

[0055] Figure 4 It is a flow chart of another embodiment of the screening method for ecological clean small watershed construction provided in the embodiments of the present application;

[0056] Figure 5 It is a schematic diagram of the structure of an embodiment of a screening device for ecological clean small watershed construction provided in the embodiments of the present application;

[0057] Figure 6 It is a schematic diagram of the terminal structure of an embodiment of the computer device provided in the embodiments of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the term "in some embodiments" is used to indicate "used as an example, illustration or explanation". Any embodiment described as "in some embodiments" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments.

[0059] It should be noted that since the system of the embodiment of the present application is executed in a computer device, the processing objects of each computer device exist in the form of data or information. For example, time is actually time information. It can be understood that if size, quantity, position, etc. are mentioned in subsequent embodiments, they are all corresponding data for processing by the computer device. The details will not be repeated here.

[0060] The embodiments of the present application provide a screening method, device, equipment and medium for the construction of an ecologically clean small watershed, which are described in detail below.

[0061] Reference Figure 1 In one embodiment, the screening method for ecological clean small watershed construction includes:

[0062] 101. Obtain multiple small watersheds in the area to be screened.

[0063] In the embodiments of the present application, the area to be screened refers to the area where the target small watershed that should be constructed first needs to be screened out, and the area to be screened can be, for example, any preset area. The preset area can be, for example, the area where the provincial administrative region is located, so as to coordinate the construction of ecological clean small watersheds in the province with the provincial administrative region as the basic unit.

[0064] Small watersheds usually refer to relatively independent and closed natural catchment areas with a catchment area of ​​less than 50 square kilometers, bounded by the watershed and the downstream river outlet section below the second and third-level tributaries. Small watersheds actually exist in the area to be screened, and all or most of the small watersheds are located in the area to be screened.

[0065] 102. Obtain a raster map of residential population density and a raster map of soil erosion intensity for the area to be screened.

[0066] In an embodiment of the present application, a grid map of the residential population density of the area to be screened is used to record the residential population density of the area to be screened in the form of a grid map. In the grid map of the residential population density of the area to be screened, the area to be screened is divided into a plurality of grid cells, and the length and / or width of each grid cell can be, for example, 30 meters or other values ​​(generally not more than 100 meters at most), and each grid cell is also associated with the number of residents in the grid cell. In the grid map of the soil and water loss intensity of the area to be screened, each grid cell is also associated with the amount of soil and water loss in the grid cell. Each grid cell is in a small watershed, that is, each small watershed includes at least one grid cell.

[0067] 103. Based on the population density grid map and the soil erosion intensity grid map, the number of residents and the amount of soil erosion in each small watershed are determined respectively, and multiple small watersheds are ranked according to the construction demand. The construction demand is determined based on the number of residents and the amount of soil erosion.

[0068] In some embodiments of the present application, the grid cells in each small watershed can be determined, and based on the population density grid map, the sum of the number of residents in all grid cells in the small watershed is used as the number of residents in the small watershed.

[0069] In some embodiments of the present application, the grid cells in each small watershed can be determined, and based on the soil erosion intensity grid map, the sum of the soil erosion amounts of all grid cells in the small watershed is used as the soil erosion amount of the small watershed.

[0070] In some embodiments of the present application, the applicant has found through research that the ecological and environmental problems of small watersheds mainly come from humans. At the same time, the construction results of ecologically clean small watersheds also serve humans more. Therefore, according to the current ecological and environmental problems and needs, considering the impact of human activities, the screening and sorting of ecologically clean small watersheds are carried out to provide a basis for the arrangement of related construction projects, which has important practical significance and application value. Since the more people live in a small watershed, the greater the impact of human activities on the small watershed, the more prominent the problems of the small watershed, the more urgent the needs, and the more obvious the construction results of ecologically clean small watersheds, therefore, based on the number of people living in each small watershed and the amount of soil and water loss, multiple small watersheds are sorted, and the target small watersheds that should be built first can be screened out more accurately.

[0071] In some embodiments of the present application, the soil erosion intensity grid map of the area to be screened is determined by the following steps: for each grid cell in the actual geographical range of the area to be screened, the soil erosion modulus of the grid cell is obtained; the product of the soil erosion modulus of the grid cell and the area of ​​the grid cell is determined to obtain the amount of soil erosion of the grid cell; based on the amount of soil erosion of each grid cell, a soil erosion intensity grid map of the area to be screened is generated.

[0072] 104. According to the sorting results, select the target small watershed.

[0073] In an embodiment of the present application, after sorting a plurality of small watersheds according to the construction demand and obtaining the sorting results of the plurality of small watersheds, a preset number of small watersheds with high rankings in the sorting results of the plurality of small watersheds can be used as target small watersheds, and then the target small watersheds can be preferentially constructed into ecologically clean small watersheds. Alternatively, after obtaining the sorting results of the plurality of small watersheds, the sorting results of the plurality of small watersheds are provided to relevant departments or relevant personnel for reference by the relevant departments or relevant personnel, so as to determine the target small watersheds among the plurality of small watersheds.

[0074] In the technical solution disclosed in this embodiment, by obtaining multiple small watersheds in the area to be screened, as well as a residential population density raster map and a soil erosion intensity raster map of the area to be screened, the number of residents and the amount of soil erosion in each small watershed are determined according to the residential population density raster map and the soil erosion intensity raster map, and the multiple small watersheds are sorted according to the construction demand to screen out the target small watersheds, so that the small watersheds that should be constructed first can be screened out more accurately.

[0075] In another embodiment, if Figure 2 As shown in the figure, the process of determining the number of residents in a small watershed is described. Figure 1 Based on the embodiment shown, the number of residents in the small watershed is determined by the following steps:

[0076] 201. Obtain the actual geographical extent of the small watershed.

[0077] In the embodiments of the present application, the actual geographical scope of the small watershed refers to the actual geographical scope of the small watershed in a real environment.

[0078] 202. Extend the actual geographical scope of the small watershed outward by a preset distance to obtain the expanded geographical scope of the small watershed.

[0079] In the embodiments of the present application, the applicant has found through research that the activities of the population around the small watershed have an impact on the soil erosion of the small watershed, so the actual geographical scope of the small watershed can be extended outward by a preset distance to fully consider the impact of the activities of the surrounding population. The preset distance can be, for example, 2 kilometers, because the activity range of the population in rural areas is generally 2 kilometers, for example, the distance of farming in rural areas is mostly about 2 kilometers.

[0080] 203. In the multiple grid cells of the residential population density grid map, the sum of the number of residential populations in the grid cells within the small watershed and its expanded geographical scope is taken as the number of residential populations in the small watershed.

[0081] In an embodiment of the present application, by taking the sum of the number of residents in the grid units within a small watershed and its expanded geographical scope as the number of residents in the small watershed, the impact of population activities around the small watershed on the ecological environment of the small watershed can be taken into account, thereby more accurately selecting small watersheds that should be constructed as a priority.

[0082] In some embodiments of the present application, the population density grid map of the area to be screened may also be extended outwards corresponding to the actual geographical scope of the small watershed. Specifically, the population density grid map of the area to be screened is obtained by the following steps: obtaining the actual geographical scope of the area to be screened; extending the actual geographical scope of the area to be screened outwards by a preset distance to obtain the expanded geographical scope of the area to be screened; using the population density grid map of the area to be screened and its expanded geographical scope as the population density grid map of the area to be screened. For example Figure 3 As shown in , the area to be screened includes the main river system and at least one small watershed. The actual geographical scope of the area to be screened is expanded as follows Figure 3 It can be seen that since the actual geographical scope of the small watershed has been expanded, the actual geographical scope of the area to be screened is also expanded accordingly to avoid the situation where the actual geographical scope of some small watersheds exceeds the actual geographical scope of the area to be screened after the actual geographical scope is expanded.

[0083] In the technical solution disclosed in this embodiment, the actual geographical scope of multiple small watersheds in the area to be screened is extended outward by a preset distance to take into account the impact of population activities around the small watersheds. In this way, the target small watersheds screened out from the multiple small watersheds are also more accurate.

[0084] In some embodiments of the present application, the generation process of the residential population density grid map of the area to be screened and its expanded geographical scope is described. Specifically, the residential population density grid map of the area to be screened and its expanded geographical scope is determined by the following steps: for each grid cell in the area to be screened and its expanded geographical scope, the number of settlements, the construction land area, the cultivated land area and the night light brightness value in the grid cell are obtained, wherein the number of settlements can be obtained using the pre-collected settlement distribution data in the area to be screened and its expanded geographical scope, the construction land area and the cultivated land area can be obtained using the pre-collected land use remote sensing data in the area to be screened and its expanded geographical scope, and the night light brightness value can be obtained using the pre-collected night light brightness data in the area to be screened and its expanded geographical scope; based on the number of settlements, the construction land area, the cultivated land area and the night light brightness value, the estimated proportion of the number of residents in the grid cell is determined; based on the estimated proportion, the number of residents in the grid cell is determined; based on the number of residents in multiple grid cells, the residential population density grid map of the area to be screened and its expanded geographical scope is generated.

[0085] In some embodiments of the present application, the area to be screened can be divided into multiple sub-areas, and the sub-areas can be, for example, areas where county-level administrative districts are located. The estimated proportion of the number of residents in a grid cell can be the estimated proportion of the number of residents in the grid cell relative to the total number of residents in the sub-area where the grid cell is located. Based on the number of settlements, the area of ​​construction land, the area of ​​cultivated land, and the night light brightness value, determining the estimated proportion of the number of residents in the grid cell can include: obtaining a first proportion of the number of settlements in the grid cell relative to the total number of settlements in the sub-area where the grid cell is located; obtaining a second proportion of the area of ​​construction land in the grid cell relative to the total area of ​​construction land in the sub-area where the grid cell is located; obtaining a third proportion of the area of ​​cultivated land in the grid cell relative to the total area of ​​cultivated land in the sub-area where the grid cell is located; obtaining a fourth proportion of the night light brightness value in the grid cell relative to the total night light brightness value in the sub-area where the grid cell is located; summing or weighted summing the first proportion, the second proportion, the third proportion, and the fourth proportion to obtain the estimated proportion of the number of residents in the grid cell relative to the total number of residents in the sub-area where the grid cell is located.

[0086] In some embodiments of the present application, determining the number of residents in a grid cell based on the estimated proportion may include: multiplying the estimated proportion of the number of residents in the grid cell relative to the total number of residents in the sub-region where the grid cell is located by the total number of residents in the sub-region where the grid cell is located, to obtain the number of residents in the grid cell. It can be seen that the number of residents in the grid cell is an estimated value. The total number of residents in the sub-region where the grid cell is located may be, for example, the number of permanent residents in the sub-region where the grid cell is located.

[0087] In yet another embodiment, Figure 4 As shown, in Figures 1 to 3 Based on any of the embodiments, the construction demand of the small watershed is determined by the following steps:

[0088] 401. Obtain the published relevant industry planning information of the area to be screened.

[0089] 402. In the relevant industry planning information, determine the number of plans involving each small watershed.

[0090] In an embodiment of the present application, the number of plans involving each small watershed includes the number of plans for the small watershed that directly appears in the relevant industry planning information.

[0091] In some embodiments of the present application, in the relevant industry planning information, the planning quantity involving each small watershed is determined separately, which may include: for each small watershed, in the relevant industry planning information, the target planning information involving the small watershed is determined; the type of involvement of each target planning information for the small watershed is determined; if the involvement type is indirect involvement, the number of small watersheds involved by the target planning information is determined to be a first number; if the involvement type is direct involvement, the number of small watersheds involved by the target planning information is determined to be a second number, and the second number is greater than the first number, for example, the first number can take a value of 1 and the second number can take a value of 2; based on the number of small watersheds involved by all target planning information, the number of plans involving the small watershed is determined, for example, the sum of the number of small watersheds involved by all target planning information can be taken as the number of plans involving the small watershed.

[0092] Among them, direct involvement refers to the situation where small watersheds appear directly in the target planning information, and indirect involvement refers to the situation where small watersheds appear indirectly in the target planning information (for example, the sub-area where the small watershed is located appears in the target planning information, etc.).

[0093] A detailed description is given by taking the sub-region where the small watershed appears in the target planning information as an example. Specifically, the area to be screened is divided into multiple sub-regions, and each small watershed is in a sub-region. The sub-region can be, for example, the region where the county-level administrative district is located. At this time, the small watershed may not appear directly in the target planning information, but the sub-region where the small watershed is located appears. At this time, it can be considered that the target planning information indirectly appears in the small watershed. Therefore, if the small watershed appears directly in the target planning information, the number of small watersheds involved in the target planning information can be counted as 2. If the small watershed does not appear directly in the target planning information, but the sub-region where the small watershed is located appears, the number of small watersheds involved in the target planning information can be counted as 1.

[0094] It can be seen that the direct appearance of small watersheds in the target planning information has a greater impact on the planning of small watersheds than the indirect appearance of small watersheds in the target planning information. Therefore, by setting the second number and the first number with different values, the planning quantity involving the small watershed can be made more accurate.

[0095] 403. Based on the population, soil erosion and planning quantity in each small watershed, the construction demand of the small watershed shall be determined.

[0096] In the embodiments of the present application, the construction demand of the small watershed is determined by comprehensively considering the number of residents in the small watershed, the amount of soil erosion, and the planned quantity, so as to make the selected target small watershed more accurate.

[0097] In some embodiments of the present application, the construction demand of a small watershed is determined based on the number of residents in each small watershed, the amount of soil erosion, and the planned number, which can include: for each small watershed, determining the product of the number of residents in the small watershed, the amount of soil erosion, and the planned number; using the product as the construction demand of the small watershed, thereby more simply calculating the construction demand of the small watershed.

[0098] In other embodiments of the present application, determining the construction demand of a small watershed based on the number of residents in each small watershed, the amount of soil erosion, and the planned number can include: determining a first ratio of the number of residents in each small watershed to the total number of residents in the area to be screened; determining a second ratio of the planned number of each small watershed to the total planned number of the area to be screened; determining a third ratio of the amount of soil erosion in each small watershed to the total amount of soil erosion in the area to be screened; determining the construction demand of the small watershed based on the first ratio, the second ratio, and the third ratio, for example, the first ratio, the second ratio, and the third ratio can be weightedly summed to obtain the construction demand.

[0099] In some embodiments of the present application, since different second quantities and first quantities are set when calculating the planned quantity involving small watersheds, the second ratio may be greater than 1. In this regard, determining the construction demand of the small watershed based on the first ratio, the second ratio, and the third ratio may include: detecting whether the second ratio is greater than a preset threshold value, the preset threshold value may be, for example, 1; if the second ratio is greater than the preset threshold value, the preset threshold value is used as the corrected second ratio; determining the construction demand of the small watershed based on the first ratio, the corrected second ratio, and the third ratio, for example, the first ratio, the corrected second ratio, and the third ratio may be weighted and summed to obtain the construction demand of the small watershed, so as to avoid the situation where the construction demand is inaccurately calculated due to the second ratio being greater than 1.

[0100] In the technical solution disclosed in this embodiment, the construction demand of each small watershed is determined by comprehensively considering the number of residents, the amount of soil erosion, and the planned quantity in each small watershed, so that the selected target small watershed can be more accurate.

[0101] Below, the screening method for the construction of ecologically clean small watersheds in the above-mentioned embodiments of the present application is illustrated.

[0102] In recent years, the construction of ecological clean small watersheds has been increasingly valued by the scientific community. However, the existing selection of the scope of ecological clean small watershed construction mainly relies on qualitative judgments by relevant personnel based on the soil and water loss situation. The selection results are easily affected by personal experience accumulation and subjective factors, and the impact of human activities and other aspects is not quantitatively considered. Therefore, from the perspective of problem needs and effectiveness, the construction of ecological clean small watersheds needs to focus on factors such as human activity impact (population), soil and water loss problems, and development planning layout, and comprehensively score the small watersheds to obtain the construction demand, and finally sort them according to the construction demand. Among them, the impact of human activities is expressed by the population density index. Based on the county population, combined with the distribution of settlements, land use types, night light data, etc., a residential population density grid map is generated; the soil and water loss problem uses the Chinese soil loss equation (CSLE) to calculate the soil erosion modulus and the amount of soil and water loss. As for the development planning layout, since the construction of ecological clean small watersheds requires the coordination and cooperation of relevant departments and extensive participation of multiple parties, the relevant industry planning information published in the area to be screened is included as a screening condition. Specifically, the following steps may be included:

[0103] (1) Delineate small watersheds and collect and process basic data.

[0104] Small watersheds are divided one by one according to needs, and small watersheds that are not in the area to be screened or are small in area are eliminated on this basis to obtain small watersheds. The actual geographical scope of the area to be screened is extended outward by a certain distance to obtain the area to be screened and its expanded geographical scope, and precipitation data, land use remote sensing data, normalized vegetation index remote sensing data, digital elevation model data, soil data, night light brightness data, settlement distribution data, and the number of permanent residents in all sub-areas in the area to be screened are collected in the area to be screened and its expanded geographical scope. The relevant industry planning information that has been published in the area to be screened is collected.

[0105] For example, the areas to be screened usually take provincial administrative regions as basic units to facilitate the overall planning of the construction of ecological clean small watersheds in provinces and regions. First, the provincial administrative region boundary is extended outward by 2 kilometers to obtain the area to be screened and its expanded geographical scope. The purpose of the extension is to consider the need to extend the actual geographical scope of the small watershed when calculating the number of residents in the small watershed later. The area of ​​the divided small watershed is generally not more than 50 square kilometers. The collected land use remote sensing data, normalized vegetation index remote sensing data, digital elevation model data and other data are mainly used to calculate the amount of soil erosion. The number of residents in the grid unit is mainly calculated based on night light brightness data, land use remote sensing data, settlement distribution data, and permanent population data of the sub-region where the grid unit is located. Collect the relevant industry planning information published by the relevant departments of the area to be screened, which is mainly used to calculate the number of plans involving small watersheds later. Extending outward by 2 kilometers, mainly because the distance of farming in rural areas is mostly about 2 kilometers. The remote sensing images in the remote sensing data must undergo radiation correction, orthorectification, fusion, mosaic and other pre-processing to ensure the accuracy of the remote sensing data.

[0106] (2) Generate a population density grid map of the area to be screened and its expanded geographical scope based on the basic data.

[0107] Taking the sub-region as the basic unit, based on the land use remote sensing data, night light brightness data, settlement distribution data raster files with the same spatial resolution, and the number of permanent residents in the sub-region, a residential population density raster map of the area to be screened and its expanded geographical scope is generated.

[0108] For example: the idea of ​​calculating the number of residents in a grid cell is based on land use remote sensing data, night light brightness data, and residential distribution data. Different weights are assigned to each type of data, and the number of permanent residents in each sub-region is considered. The number of residents in each grid cell in the sub-region is calculated, and on this basis, the number of residents in the small watershed and its expanded geographical scope is counted. Specifically, the collected land use remote sensing data, night light brightness data, and residential distribution data are used to generate raster maps with a spatial resolution of 30m or other resolutions using Geographic Information System (GIS) software, and the maximum spatial resolution does not exceed 100m. Taking the sub-region as the basic unit, combined with the previously generated raster map and the number of permanent residents in the sub-region, the number of residents in each grid cell in the sub-region is calculated according to the following formula to generate a residential population density raster map of the sub-region, and the above steps are repeated to generate a residential population density raster map of each sub-region of the area to be screened and its expanded geographical scope, and finally a residential population density raster map of the area to be screened and its expanded geographical scope is formed.

[0109]

[0110] The data involved in the above formula refers to the data within the sub-region, among which P 栅 Refers to the number of people living in each grid cell; Refers to the first ratio of the number of settlements in a grid cell to the total number of settlements in the sub-region where the grid cell is located; Refers to the second proportion of the construction land area in the grid cell relative to the total construction land area of ​​the sub-region where the grid cell is located; Refers to the third proportion of the cultivated land area in the grid unit relative to the total cultivated land area of ​​the sub-region where the grid unit is located; Refers to the fourth percentage of the night light brightness value in the grid cell relative to the total night light brightness value of the sub-region where the grid cell is located; P 县 Refers to the total number of residents in the sub-region where the grid cell is located.

[0111] (3) Generate a raster map of soil erosion intensity in the area to be screened based on the basic data.

[0112] The rainfall data, land use remote sensing data, normalized difference vegetation index remote sensing data, digital elevation model data, and soil data of the area to be screened are processed into raster maps with the same spatial resolution, and the rainfall erosivity factor, soil erodibility factor, slope length factor, slope factor, vegetation cover and biological measure factor, soil and water conservation engineering measure factor, and tillage measure factor of each grid unit are extracted. The soil erosion modulus of each grid unit is calculated using the Chinese soil loss equation, and the amount of soil and water loss of each grid unit is calculated based on the soil erosion modulus. Finally, a raster map of soil and water loss intensity of the area to be screened is generated.

[0113] For example, the spatial resolution of rainfall data and other data after processing should be consistent with the resolution of the residential population density grid map of the area to be screened. After calculating the soil erosion modulus of each grid cell using the Chinese soil loss equation, multiply it by the area of ​​the grid cell to obtain the amount of soil and water loss in the grid cell, and finally form a soil and water loss intensity grid map of the area to be screened.

[0114] (4) Statistics on the number of residents, amount of soil erosion, and planning quantity in each small watershed.

[0115] Each small watershed is extended outward for a certain distance to obtain the small watershed and its expanded geographical scope. Based on the previously calculated residential population density grid map of the area to be screened and its expanded geographical scope, the number of residents in each small watershed and its expanded geographical scope is counted and used as the number of residents in the small watershed. Based on the previously calculated soil erosion intensity grid map of the area to be screened, the amount of soil erosion in each small watershed is counted. According to the published relevant industry planning information of the area to be screened, the number of plans involving each small watershed is counted.

[0116] For example: extend each small watershed outward by 2 kilometers to obtain the small watershed and its expanded geographical scope. The extension distance of 2 kilometers is mainly because the farming distance in rural areas is mostly about 2 kilometers. Extending a certain distance outward is mainly to consider the impact of the surrounding population on the ecological environment of the small watershed, which is also the impact of human activities to be highlighted in the embodiment of this application. When counting the planning quantity, if the small watershed appears indirectly in the target planning information (for example, the sub-area where the small watershed is located is mentioned), the number of small watersheds involved in the target planning information is recorded as 1; if the small watershed is directly mentioned in the relevant industry planning information, the number of small watersheds involved in the target planning information is recorded as 2.

[0117] (5) Calculate the construction demand of each small watershed and rank them.

[0118] Based on the number of residents, soil erosion, and planning quantity in each small watershed counted previously, the construction demand of the small watershed is calculated and ranked from high to low according to the construction demand. A high demand means that the small watershed has a large number of residents, a large amount of soil erosion, and involves many plans, and construction needs to be given priority. Conversely, a low demand means that the construction sequence will be later.

[0119] For example: After obtaining the number of residents, soil erosion, and planned quantity in each small watershed, the construction demand of each small watershed is calculated according to the following formula:

[0120] I 流 =P 流 ×E 流 ×N 流

[0121] Among them, I 流 Refers to the construction demand of small watershed; P 流 Refers to the number of residents in a small watershed, unit: person; E 流 Refers to the amount of soil and water loss in a small watershed, unit: 10,000 tons; N 流 Refers to the number of plans involving small watersheds, unit: piece.

[0122] In order to better implement the screening method for ecological clean small watershed construction in the embodiment of the present application, on the basis of the screening method for ecological clean small watershed construction, the embodiment of the present application also provides a screening device for ecological clean small watershed construction, such as Figure 5 As shown, the screening device 500 for ecological clean small watershed construction includes a first acquisition module 501, a second acquisition module 502, a sorting determination module 503 and a watershed screening module 504, which are specifically as follows:

[0123] The first acquisition module 501 is used to acquire multiple small watersheds in the area to be screened;

[0124] The second acquisition module 502 is used to obtain a residential population density grid map and a soil erosion intensity grid map of the area to be screened;

[0125] The sorting determination module 503 is used to determine the number of residents and the amount of soil and water loss in each small watershed according to the residential population density grid map and the soil and water loss intensity grid map, and sort the multiple small watersheds according to the construction demand, and the construction demand is determined based on the number of residents and the amount of soil and water loss;

[0126] The watershed screening module 504 is used to screen out target small watersheds according to the sorting results.

[0127] The present application also provides a computer device that integrates any of the screening devices for ecological clean small watershed construction provided in the present application. Figure 6As shown, it shows a schematic diagram of the structure of the computer device involved in the embodiment of the present application, specifically:

[0128] The computer device may include components such as a processor 601 with one or more processing cores, a memory 602 with one or more computer-readable storage media, a power supply 603, and an input unit 604. Those skilled in the art will appreciate that Figure 6 The computer device structure shown in the figure is not intended to limit the computer device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0129] The processor 601 is the control center of the computer device. It uses various interfaces and lines to connect various parts of the entire computer device. By running or executing software programs and / or modules stored in the memory 602 and calling data stored in the memory 602, it executes various functions of the computer device and processes data, thereby monitoring the computer device as a whole. Optionally, the processor 601 may include one or more processing cores; preferably, the processor 601 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 601.

[0130] The memory 602 can be used to store software programs and modules. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory 602. The memory 602 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 602 may also include a memory controller to provide the processor 601 with access to the memory 602.

[0131] The computer device also includes a power supply 603 for supplying power to various components. Preferably, the power supply 603 can be logically connected to the processor 601 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. The power supply 603 can also include any components such as one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, and power status indicators.

[0132] The computer device may further include an input unit 604, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0133] Although not shown, the computer device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 601 in the computer device will load the executable files corresponding to the processes of one or more application programs into the memory 602 according to the following instructions, and the processor 601 will run the application programs stored in the memory 602, thereby realizing various functions, such as:

[0134] Acquire multiple small watersheds in the area to be screened; acquire a residential population density raster map and a soil erosion intensity raster map of the area to be screened; determine the number of residents and the amount of soil erosion in each small watershed according to the residential population density raster map and the soil erosion intensity raster map, and sort the multiple small watersheds according to the construction demand, which is determined based on the number of residents and the amount of soil erosion; and screen out the target small watershed according to the sorting results.

[0135] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0136] To this end, the embodiment of the present application provides a computer-readable storage medium, which may include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc. A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in any one of the screening methods for the construction of an ecologically clean small watershed provided in the embodiment of the present application. For example, the computer program can be loaded by a processor to execute the following steps:

[0137] Acquire multiple small watersheds in the area to be screened; acquire a residential population density raster map and a soil erosion intensity raster map of the area to be screened; determine the number of residents and the amount of soil erosion in each small watershed according to the residential population density raster map and the soil erosion intensity raster map, and sort the multiple small watersheds according to the construction demand, which is determined based on the number of residents and the amount of soil erosion; and screen out the target small watershed according to the sorting results.

[0138] In addition, an embodiment of the present application provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device executes to implement the screening method for ecological clean small watershed construction as described in any one of the above items.

[0139] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0140] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0141] The above is a detailed introduction to the screening method, device, equipment and medium for the construction of an ecologically clean small watershed provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A screening method for ecological clean small watershed construction, characterized in that: The screening method for the construction of ecological clean small watersheds includes: Acquire multiple small watersheds in the area to be screened; Obtain a residential population density grid map and a soil erosion intensity grid map of the area to be screened; According to the residential population density grid map and the soil erosion intensity grid map, respectively determine the number of residents and the amount of soil erosion in each of the small watersheds, and sort the multiple small watersheds according to the construction demand, wherein the construction demand is determined based on the number of residents and the amount of soil erosion; According to the sorting results, select the target small watershed; The construction demand of the small watershed is determined by the following steps: obtaining the published relevant industry planning information of the area to be screened; determining the planning quantity involved in each small watershed in the relevant industry planning information; determining the construction demand of the small watershed based on the number of residents in each small watershed, the amount of soil erosion and the planning quantity; The number of plans involving each of the small watersheds is determined in the relevant industry planning information, including: for each of the small watersheds, in the relevant industry planning information, the target planning information involving the small watershed is determined; the type of involvement of each of the target planning information for the small watershed is determined; if the involvement type is indirect involvement, the number of the target planning information involving the small watershed is determined to be a first number; if the involvement type is direct involvement, the number of the target planning information involving the small watershed is determined to be a second number, and the second number is greater than the first number; based on the number of involvement of all the target planning information for the small watershed, the number of plans involving the small watershed is determined.

2. The screening method for ecological clean small watershed construction according to claim 1, characterized in that: The number of residents in the small watershed is determined by the following steps: Obtaining the actual geographical extent of the micro-watershed; Extending the actual geographical scope of the small watershed outward by a preset distance to obtain an expanded geographical scope of the small watershed; In a plurality of grid cells of the residential population density grid map, the sum of the number of residential populations in the grid cells within the small watershed and its expanded geographical range is taken as the number of residential populations in the small watershed; The residential population density grid map of the area to be screened is obtained by the following steps: Obtaining the actual geographical scope of the area to be screened; Extending the actual geographical scope of the area to be screened outward by a preset distance to obtain an expanded geographical scope of the area to be screened; The residential population density grid map of the area to be screened and its expanded geographical range is used as the residential population density grid map of the area to be screened.

3. The screening method for ecological clean small watershed construction according to claim 2, characterized in that: The residential population density grid map of the area to be screened and its expanded geographical scope is determined by the following steps: For each of the grid cells in the area to be screened and its expanded geographical range, obtain the number of settlements, construction land area, cultivated land area and night light brightness value in the grid cell; Determine the estimated proportion of the number of residents in the grid unit based on the number of settlements, the area of ​​construction land, the area of ​​cultivated land, and the night light brightness value; Based on the estimated proportion, determining the number of residents in the grid cell; According to the number of residents in the plurality of grid cells, a resident population density grid map of the area to be screened and its expanded geographical scope is generated.

4. The screening method for ecological clean small watershed construction according to claim 1, characterized in that: The soil erosion intensity grid map of the area to be screened is determined by the following steps: For each grid cell in the actual geographical range of the area to be screened, obtaining the soil erosion modulus of the grid cell; Determine the product of the soil erosion modulus of the grid cell and the area of ​​the grid cell to obtain the amount of soil and water loss of the grid cell; Based on the amount of soil erosion in each grid cell, a grid map of soil erosion intensity in the area to be screened is generated.

5. The screening method for ecological clean small watershed construction according to claim 1, characterized in that: The step of determining the construction demand of each small watershed based on the number of residents, the amount of soil erosion and the planned quantity in each small watershed includes: For each of the small watersheds, determine the product of the number of residents in the small watershed, the amount of soil erosion, and the planned amount; The product is used as the construction demand of the small watershed.

6. A screening device for ecological clean small watershed construction, characterized in that: The screening device for the construction of ecological clean small watersheds includes: The first acquisition module is used to acquire multiple small watersheds in the area to be screened; The second acquisition module is used to obtain a residential population density grid map and a soil and water loss intensity grid map of the area to be screened; A sorting and determining module, for determining the number of residents and the amount of soil and water loss in each of the small watersheds according to the residential population density grid map and the soil and water loss intensity grid map, and sorting the multiple small watersheds according to the construction demand, wherein the construction demand is determined based on the number of residents and the amount of soil and water loss; The watershed screening module is used to screen out the target small watershed according to the sorting results; The construction demand of the small watershed is determined by the following steps: obtaining the published relevant industry planning information of the area to be screened; determining the planning quantity involved in each small watershed in the relevant industry planning information; determining the construction demand of the small watershed based on the number of residents in each small watershed, the amount of soil erosion and the planning quantity; The number of plans involving each of the small watersheds is determined in the relevant industry planning information, including: for each of the small watersheds, in the relevant industry planning information, the target planning information involving the small watershed is determined; the type of involvement of each of the target planning information for the small watershed is determined; if the involvement type is indirect involvement, the number of the target planning information involving the small watershed is determined to be a first number; if the involvement type is direct involvement, the number of the target planning information involving the small watershed is determined to be a second number, and the second number is greater than the first number; based on the number of involvement of all the target planning information for the small watershed, the number of plans involving the small watershed is determined.

7. A computer device, characterized in that: The computer device comprises: one or more processors; Memory; and One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the steps in the screening method for constructing an ecologically clean small watershed as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the screening method for constructing an ecologically clean small watershed as described in any one of claims 1 to 5.

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