DEM制作中基于ArcGIS平台处理平三角的方法探究

The Research on Processing Method of Flat Triangle Based on ArcGIS Platform in DEM Production

在利用三角网制作DEM的过程中,山脊和山谷部位会出现同一个三角网格3个点高程值相等的情况,在3D渲染中显示为平面三角形平台,与实际山形不符,需要在平三角区域加测数据来弥补数据缺陷。现以等高线和高程点为基础,通过ArcGIS平台的3D分析工具判断山体的整体走向,在山脊和山谷自动内插高程点,重新构建三角网制作DEM,消除平三角。可以省去人工补测数据带来的工作量,自动消除不合理平三角,提高生产效率。

In the process of using triangulation to make DEM,the elevation values of three points in the same triangle mesh will be equal in the ridge and valley,which will be displayed as a plane triangle platform in 3D rendering,which is not consistent with the actual mountain shape,so it is necessary to add survey data in the plane triangle area to make up for the data gap.Based on contour lines and elevation points,3D analysis tools of ArcGIS platform are used to judge the overall trend of the mountain,automatically interpolate elevation points in the ridge and valley,reconstruct triangulation network,make DEM and eliminate flat triangle.This method can save the workload of manual supplementary measurement data,automatically eliminate the unreasonable flat triangle,and improve the work efficiency.