不同比例尺数字高程模型在水土保持信息提取中的应用分析

Analysis on Application of Digital Elevation Model with Different Scales in Information Collection of Soil and Water Conservation

在ARCGIS软件支持下 ,基于不同比例尺的DEM提取坡度信息 ,与土地利用类型、植被覆盖度和土壤侵蚀强度等专题信息叠置 ,提取水土保持专题信息 ,并对提取结果进行应用分析。研究结果表明 ,1∶1万比例尺的DEM可在小流域规划设计、水土流失监测、信息系统建设等工作中应用 ,1∶5万比例尺的DEM可用在重点支流、重点治理区 (片 )等尺度上的三维可视化系统建立、水土保持规划等 ,1∶2 5万比例尺的DEM只能在较大区域中进行宏观信息提取时使用。

The paper collects the information of special topic on soil and water conservation and conduct applied analysis on the collected data with the support of ARCGIS software, based on DEM collected slope information in different scales and overlapping the special information of types of land utilization, rate of vegetation coverage and intensity of soil erosion. It is shown by the results of study that 1∶10 000 scale DEM can be applied in small watershed planning and design, soil and water loss monitoring and establishment of information system. 1∶50 000 scale DEM can be used in the establishment of 3D visible system and planning of soil and water conservation of key tributaries and regions. 1∶250 000 scale DEM can be used in collecting macro information of only larger regions.