Ecological corridor refers to a corridor or channel that connects different ecosystems. Its establishment helps solve the problem of fragmentation and isolation of wildlife habitats caused by human activities. problems, increase biodiversity and reduce pressure on ecosystems. In the context of expanding urbanization and agricultural development, ecological corridors are of great significance to the survival and reproduction of wildlife. The following will introduce how to use ArcGIS to simulate ecological corridors.
1
data preparation
Obtain the remote sensing data required for this experiment, as shown in Table 1-1.
Table 1-1
2Additional number
Click [Add Data], find the required data, and click [OK], as shown in Figure 2-1.
Figure 2-1
3Number of calculations
(1) According to the influence range of resistance produced by different roads, buffer zones of different distances are established for the three road layers in sequence, as shown in Figure 3-1, Figure 3-2, and Figure 3-3.
Figure 3-1
Figure 3-2
Figure 3-3
(2) Add resistance value fields to each buffer zone road surface layer: urban roads 150, highways 200, and railways 300, as shown in Figure 3-4.
Figure 3-4
(3) Set the resistance value for the river surface layer: 80, as shown in Figure 3-5.
Figure 3-5
(4) Convert the river and three surface road elements into raster elements based on the resistance value field, as shown in Figure 3-6, Figure 3-7, Figure 3-8, and Figure 3-9.
Figure 3-6
Figure 3-7
Figure 3-8
Figure 3-9
(5) Set different resistance values for different land types and reclassify them, as shown in Figure 3-10 and Figure 3-11.
Figure 3-10
Figure 3-11
(6) Fusion of five raster images of land use type, railway, highway, urban road, and river to obtain the resistance surface (since the resistance value of the railway raster layer is 300, the pixel type should be set to 16 bit), As shown in Figure 3-12 and Figure 3-13.
Figure 3-12
Figure 3-13
(7) Forest Park is the "source", select one of them, select the resistance surface and output a cost distance and backtracking link direction. The Cost Distance tool is similar to the Euclidean tool, except that the Euclidean tool calculates the actual distance between locations, while the Cost Distance tool determines the shortest weighted distance (or cumulative travel cost) of each cell from the nearest source location. ). The algorithm used to calculate the backlink raster assigns a code value to each cell. The code is a series of integers between 0 and 8. The value 0 is used to represent source locations because, essentially, they have reached the destination (i.e., the source itself). Value 1 to value 8 encode the direction in clockwise direction starting from the right, as shown in Figure 3-14, Figure 3-15, and Figure 3-16.
Figure 3-14
Figure 3-15
Figure 3-16
(8) Enter the cost distance and backtracking link direction to obtain the cost path. As shown in Figure 3-17 and Figure 3-18.
Figure 3-17
Figure 3-18
4Seifu Corridor
The rendering of the ecological corridor is shown in Figure 4-1.
Pic 4-1
5Conclusion
The above is a detailed description of how to create an ecological corridor simulation, which mainly includes operations such as establishing road buffers, setting resistance values, fusing raster layers, calculating cost distances and cost paths, etc., in order to simulate ecological corridors and protect organisms. Provide solutions for diversity and reducing wildlife habitat fragmentation.