Citation: | MENG Xiaojie,GUO Xiaopeng,XUE Qiang,et al. Research on Optimal Scale for Extraction of Relief Amplitude in Loess Geological Hazards Assessment Factors: a Case Study of Mizhi County, Yulin City[J]. Northwestern Geology,2024,57(6):234−243. doi: 10.12401/j.nwg.2023181 |
In the current evaluation of geological hazards, there is a certain degree of arbitrariness and subjectivity in selecting the best window unit scale for the extraction of relief amplitude (also named relative slope height). The certain error exists as compared the obtained relief amplitude parameters with the actual situation in the study area. During the disaster assessment, using grid-based information models or various popular machine learning methods can lead to a reduction in the reliability of the evaluation results due to the errors of the evaluation factors. In the current study, we use DEM data (2 m resolution) of Mizhi County, adopt 10×10, 1×1 rectangular windows for the relief amplitude extraction based on ArcGIS platform, and use the mean change-point analysis to calculate the relief amplitude of Mizhi County from 0–256.60 m, and the best statistical cell is 59×59 with the grid length of 2 m, and the side length of the extraction window is 118m and square is
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