Table 2 The threat factors and related coefficients.
Threat factor | drma (km) | Weight wr | Distance–decay function |
|---|---|---|---|
Cultivated land | 3 | 0.6 | Linear |
Urban land | 10 | 0.8 | Exponential |
Rural settlement | 5 | 0.6 | Exponential |
Other construction land | 8 | 0.7 | Exponential |
Unused land | 1 | 0.5 | Linear |
