ArcGIS环境下基于DEM的地形指标和水文信息提取分析

Topographic Indicators and Hydrological Information Extraction and Analysis Based on DEM

采用无人机倾斜摄影测量技术,获得青海省某一区域影像和高程数据,基于ArcGIS强大的数据分析和处理能力,生成研究区三维可视化模型,并计算该区域坡度变率、坡向变率、地形起伏度和地面粗糙度等地形变化指标,提取山脊线和山谷线等地形特征参数,分析研究区地形地貌分布与变化情况。在此基础上,对研究区进行洪水淹没分析,模拟不同淹没深度条件下淹没区域变化情况。

Using drone tilt photogrammetry technology,image and elevation data of a certain area in Qunke Town,Hualong County,Qinghai Province were obtained.Based on the powerful data analysis and processing capabilities of ArcGIS,a three dimensional visualization model of the study area was generated,and the area's slope variability(SOS),aspect variability(SOA),topographic undulation(QFD)and ground roughness were calculated And other terrain change indicators,extract the terrain feature parameters such as ridge lines and valley lines,and analyze the distribution and changes of the topography of the study area.On this basis,a flood inundation analysis was carried out on the study area,and the changes in the inundation area under different inundation depth conditions were simulated to provide a reference for the early warning and prevention of mountain flood disasters.