## 3 Data Preparation and Analysis
### Evaluation Factor Analysis
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Evaluation Factors** & **Classification** & **Type** & \(N_{ij}\) & \(S_{ij}\) & \(S_{ij}\)/\(S\) & \(N_{ij}\)/\(N\) & **FR** \\ \hline \multirow{3}{*}{Elevation} & low mountains & continuous & 147,862 & 52 & 3.76\% & 5.07\% & 1.35 \\  & middle mountains & continuous & 3,783,952 & 973 & 96.24\% & 94.93\% & 0.99 \\ \hline \multirow{6}{*}{Slope} & flat & 179,825 & 1 & 4.57\% & 0.10\% & 0.02 \\  & moderate & 903,278 & 95 & 22.97\% & 9.27\% & 0.40 \\  & incline & 1,543,192 & 340 & 39.25\% & 33.17\% & 0.85 \\  & steep & continuous & 1,018,128 & 334 & 25.89\% & 32.59\% & 1.26 \\  & rapid & 245,035 & 184 & 6.23\% & 17.95\% & 2.88 \\  & dangerous & 42,356 & 71 & 1.08\% & 6.93\% & 6.43 \\ \hline \multirow{6}{*}{Slope direction} & Else & 10,215 & 0 & 0.26\% & 0.00\% & 0.00 \\  & north & 487,498 & 15 & 12.40\% & 1.46\% & 0.12 \\  & northeastern & 485,069 & 114 & 12.34\% & 11.12\% & 0.90 \\  & east & 500,801 & 117 & 12.74\% & 11.41\% & 0.90 \\  & southeast & continuous & 509,367 & 186 & 12.96\% & 18.15\% & 1.40 \\  & south & 482,217 & 123 & 12.26\% & 12.00\% & 0.98 \\  & southwestern & & 517,237 & 240 & 13.16\% & 23.41\% & 1.78 \\  & western & & 479,561 & 121 & 12.20\% & 11.80\% & 0.97 \\  & northwest & & 459,849 & 39 & 11.70\% & 3.80\% & 0.33 \\ \hline \multirow{6}{*}{Curvature} & \(\leq\)0 & continuous & 2,365,223 & 647 & 60.16\% & 63.12\% & 1.05 \\  & \(>\)0 & continuous & 1,566,591 & 378 & 39.84\% & 36.88\% & 0.93 \\ \hline \multirow{6}{*}{Quantity of rainfall} & \(<\)1200 mm & & 396,165 & 223 & 10.08\% & 21.76\% & 2.16 \\  & 1200–1300 mm & & 853,043 & 242 & 21.70\% & 23.61\% & 1.09 \\  & 1300–1400 mm & & 962,239 & 114 & 24.47\% & 11.12\% & 0.45 \\  & 1400–1500 mm & & 806,605 & 230 & 20.51\% & 22.44\% & 1.09 \\  & 1500–1600 mm & & 692,583 & 115 & 17.61\% & 11.22\% & 0.64 \\  & \(>\)1600 mm & & 221,179 & 61 & 5.63\% & 5.95\% & 1.06 \\ \hline \multirow{6}{*}{NDVI} & 0–0.30 & & 170,370 & 113 & 4.33\% & 11.02\% & 2.54 \\  & 0.30–0.60 & & 1,357,292 & 535 & 34.52\% & 52.20\% & 1.51 \\  & 0.60–0.80 & continuous & 1,219,988 & 238 & 31.03\% & 23.22\% & 0.75 \\  & 0.80–0.90 & & 471,944 & 68 & 12.00\% & 6.63\% & 0.55 \\  & 0.90–1.00 & & 712,220 & 71 & 18.11\% & 6.93\% & 0.38 \\ \hline \multirow{6}{*}{Distance from road} & 0–200 m & & 407,332 & 344 & 10.36\% & 33.56\% & 3.24 \\  & 200–400 m & & 333,967 & 112 & 8.49\% & 10.93\% & 1.29 \\  & 400–600 m & & 298,890 & 77 & 7.60\% & 7.51\% & 0.99 \\  & 600–800 m & & 271,858 & 50 & 6.91\% & 4.88\% & 0.71 \\  & 800–1000 m & & 249,179 & 37 & 6.34\% & 3.61\% & 0.57 \\  & \(>\)1000 m & & 2,370,588 & 405 & 60.29\% & 39.51\% & 0.66 \\ \hline \multirow{6}{*}{Distance from river} & 0–200 m & & 392,232 & 293 & 9.98\% & 28.59\% & 2.87 \\  & 200–400 m & & 367,396 & 126 & 9.34\% & 12.29\% & 1.32 \\  & 400–600 m & & 352,977 & 45 & 8.97\% & 4.39\% & 0.49 \\  & 600–800 m & & 333,975 & 125 & 8.49\% & 12.20\% & 1.44 \\  & 800–1000 m & & 313,162 & 56 & 7.96\% & 5.46\% & 0.69 \\  & \(>\)1000 m & & 2,172,252 & 380 & 55.25\% & 37.07\% & 0.67 \\ \hline \multirow{6}{*}{Stratigraphic} & Pt1-2L & & 456,693 & 36 & 11.62\% & 3.51\% & 0.30 \\  & T3 sc & & 364,912 & 78 & 9.28\% & 7.61\% & 0.82 \\  & P1d & & 969,094 & 270 & 24.65\% & 26.34\% & 1.07 \\  & J2h & & 453,505 & 62 & 11.53\% & 6.05\% & 0.52 \\  & D1w & & 254,016 & 60 & 6.46\% & 5.85\% & 0.91 \\  & C1 pz & & 831,436 & 368 & 21.15\% & 35.90\% & 1.70 \\  & lithology & \(\varphi\omega\) & discrete & 4203 & 0 & 0.11\% & 0.00\% & 0.00 \\  & Qh & & 58,522 & 0 & 1.49\% & 0.00\% & 0.00 \\  & N1n & & 249,953 & 15 & 6.36\% & 1.46\% & 0.23 \\  & Ey\(\delta\pi\) & & 62,648 & 116 & 1.59\% & 11.32\% & 7.10 \\  & O1 lj & & 35,968 & 0 & 0.91\% & 0.00\% & 0.00 \\  & Pzl\(\ln\) & & 190,864 & 20 & 4.85\% & 1.95\% & 0.40 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Evaluation factor grading FR values. With the increase in distance from the road and the river, the FR value tended to decrease gradually. In the distance from the road and the river (0-200 m), the FR value was the largest at 3.24 and 2.87, respectively.