基于DLG水系的DEM修正方法研究  

Research on a method for DEM-derived stream adjustment based on DLG

作　　者：祝士杰[1] 汤国安[1] 贾旖旎[1] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210046

出　　处：《现代测绘》2009年第6期3-4,16,共3页Modern Surveying and Mapping

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA12Z212);国家自然科学基金资助项目(40671148;40801148)

摘　　要：在利用ArcGIS等地形分析软件对DEM数据进行径流网络的自动提取时,由于水流方向算法的局限,在地势较平缓区域往往会出现平行河现象,造成平缓地区水系的误差。本文提出一种通过对原始DEM栅格数据进行河网特征嵌入与高程修正来实现对水系误差快速修正的方法。Stream network based on DEMs can be easily extracted by Terrain Analysis Software like ArcGIS. However, because of the limitation of general flow direction algorithm, there often occur some parallel rivers in flat areas, especiallyplains, which leads to errors in stream links. To solve this problem, this paper introduces a method to amend the errors of stream links making use of DLG data and elevation adjustment based on original DEMs. The result shows it greatly improve the spatial relation accuracy of steam networks derived from DEM dataset.

关 键 词：DEM DLG 水系 

分 类 号：P224[天文地球—大地测量学与测量工程]