# Monitoring and Analysis of Slope Geological Hazards Based on UAV Images
## 5 Geographic Information Interpretation and Analysis
### Stability Analysis
Each expert completed the questionnaire independently, thereby avoiding potential bias or authority dominance that may arise from group discussions. The maximum eigenvalue of the matrix was calculated as \(\lambda_{\text{max}}=4.218\), the consistency evaluation index (CI) was 0.073, the random consistency index (RI) was 0.89, and the consistency ratio (CR) was 0.082 (<0.1). These results indicate that the slope stability assessment index system has good consistency and reasonable judgment. By performing step-by-step calculations, the weights of the secondary indicators were obtained, as shown in Table 4, and verified to be in good agreement. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**A** & **B1** & **B2** & **B3** & **B4** & **WB** \\ \hline B1 & 1 & 3 & 5 & 7 & 0.513 \\ B2 & 1/3 & 1 & 3 & 5 & 0.289 \\ B3 & 1/5 & 1/3 & 1 & 3 & 0.135 \\ B4 & 1/7 & 1/5 & 1/3 & 1 & 0.054 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Matrix of indicators for first-level evaluations. The \"Golden Section\" method was used to determine the hazard scores of the indicators at all levels of the slope impact factor, minimizing the arbitrariness of scoring [57]. If the indicator danger is large, the score is 1; if the danger is medium, the score is 0.618; and if the danger is small, the score is 0.382. The classification of the secondary evaluation indicators and their quantitative scores are shown in Table 5. The scoring values of the secondary indicators were determined based on the actual situation in Jinan City. According to the literature and the geological survey report issued by the Natural Resources Agency [58; 59], it is known that the study area is rich in a large number of hard bedrock, the structural surface density is low, the weathering grade is medium weathering, the annual rainfall is 400-800 mm, the basic seismic intensity is 7 degrees, and the buried depth of groundwater level is greater than 5 m. According to the acquired model of the study area, it is known that the area is dominated by steep slopes with slopes greater than 30\({}^{\circ}\), and the presence of a large number of lateral breaks and more concave shapes. According to the site investigation, the vegetation cover of the area is less than 30%, and the area is a waste quarry. Following the recent construction of roads around the area, the excavation area is more than 30%, and the damage to vegetation is moderate. As shown in Table 6, the scoring value (C\({}_{\text{I}}\)) of the secondary evaluation index for the slope, as well as the comprehensive scoring value (C\({}_{\text{i}}\)W\({}_{\text{C}_{\text{I}}}\)) considering the weights, are clarified and calculated using Equation (2). Based on this, the hazard index of the slope \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**B** & **C\({}_{\text{I}}\)** & **C\({}_{\text{2}}\)** & **C\({}_{\text{3}}\)** & **C\({}_{\text{4}}\)** & **C\({}_{\text{5}}\)** & **C\({}_{\text{6}}\)** & **C\({}_{\text{7}}\)** & **C\({}_{\text{8}}\)** & **C\({}_{\text{9}}\)** & **C\({}_{\text{10}}\)** & **C\({}_{\text{11}}\)** \\ \hline W\({}_{\text{C}}\) & 0.277 & 0.152 & 0.084 & 0.163 & 0.056 & 0.029 & 0.050 & 0.019 & 0.039 & 0.077 & 0.036 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Weights of secondary evaluation indicators.