基于LRIS-3D建立高分辨率DEM的方法及对比研究  

High Resolution DEM Extraction Based on LRIS-3D System and Its Comparative Research

作　　者：田丰[1] 秦奋[1] 

机构地区：[1]河南大学环境与规划学院,河南开封475004

出　　处：《地理空间信息》2008年第1期80-83,共4页Geospatial Information

基　　金：科技部科技基础条件平台建设计划资助项目(2004DKA20180);水利部科技创新基金资助项目(SCX2002-08)

摘　　要：在基于LRIS-3D系统建立高分辨率DEM基础上,以黄土高原丘陵沟壑区桥沟小流域为对象,利用GIS工具,以三维激光扫描系统扫描数据为基础数据,研究基于DEM的数字地形特征和水文特征的提取与分析方法。研究结果表明:与普通DEM相比,高分辨率DEM提取研究区平均坡度变小、坡度标准差变大,总体地形向平坦转化,坡面曲率增大,沟壑密度增大,更详细地描述了地表特征。对流域水文过程分析、特别是对流域汇流的参数确定及汇流模型的建立有积极作用。Based on development of high resolution DEM with help of LRIS-3D system taking the Qiaogou small basin locates in hilly and gully region as test region ; using the 3D laser scanner data as base data. The paper discussed a method of using GIS technology to extract and analyze digital terrain and hydrological characteristics. The results indicate that： Comparing with the original DEM, the average slop extracted from high resolution DEM become small; Standard deviation of the slop become bigger; slop curvatures become remarkable; the gully density become complicated; and general terrain become smoothness, the landform characteristics can be described exactly. These results take positive effect in hydrological process analysis of small watershed, especially in confrim of watershed concentration and in the development of concentration model.

关 键 词：数字高程模型 高分辨率DEM LRIS-3D系统 黄土高原 

分 类 号：TH871[机械工程—仪器科学与技术] S158[机械工程—精密仪器及机械]