基于ArcGIS平台的广东云浮云安区地质灾害危害程度分区评价

The assessment on hazard degree division of geology disaster in Yun’an District based on ArcGIS

在云安区1∶5万地质灾害详细调查的基础上,选取了土地利用现状、人口密度、受地灾隐患点威胁的人口及财产4个要素作为评价因子,利用ArcGIS空间分析功能,建立了各评价因子的空间数据库;通过对各评价因子的分级赋值及归一化处理,得到了各评价因子的无量纲分级数据;在此基础上,通过空间叠加分析,得到云安区地质灾害危害程度定量分级成果图;最后经综合分析,得到云安区地质灾害危害程度分区图,研究结果对进一步提高区域地质灾害风险预测能力及提升综合防治水平具有重要的理论和实际意义。

Based on the detailed investigation of 1∶50000 geological hazards in Yun’an,four factors including land use status,population density,population and property threatened by potential disaster points were selected as evaluation factors,and the spatial database of each evaluation factor was established by using ArcGIS spatial analysis function.Then,through the hierarchical quantification and normalization of each evaluation factor,the dimensionless grading data of each evaluation factor was obtained.On this basis,through the spatial superposition analysis,the results of quantitative classification of geological hazards in Yun’an District was obtained.Finally,after comprehensive analysis,the zoning map of the degree of geological hazards in Yun’an District was obtained.The research results have important theoretical and practical significance for further improving the risk prediction ability of regional geological hazards and improving the level of comprehensive control.