坡度随水平分辨率变化及其空间格局研究  

Changes of DEM-derived Slope with Horizontal Resolution and Their Spatial Distribution

作　　者：刘红艳[1] 杨勤科[2,3] 王春梅[3] 李俊[1] 

机构地区：[1]西北农林科技大学资源环境学院,杨凌市邰城路3号712100 [2]西北大学城市与环境学院,西安市长安区学府大道1号710069 [3]中国科学院水利部水土保持研究所,杨凌市西农路26号712100

出　　处：《武汉大学学报（信息科学版）》2012年第1期105-109,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40971173);国家973计划资助项目(2007CB407203)

摘　　要：以黄土丘陵沟壑区的县南沟流域为研究区,基于1∶1万地形图,利用ANUDEM软件生成5m到200m分辨率DEM,并利用Arc/Info中计算坡度的方法提取了各种分辨率的坡度。研究表明,随着DEM分辨率的降低,单个样点坡度值表现出不确定性,但同一坡度级所有栅格点的坡度均值呈现一定的规律性,低坡度段表现为先升高后降低,中坡度段呈现微弱变化,陡坡度段呈现对数降低趋势;沟沿线上坡度值呈比较剧烈的下降趋势、分水线和流水线上坡度缓慢下降。In the paper,taking Xiannangou watershed,representing the loess hilly geomorphology landscape,as the test area,a series of hydrologically corrected DEMs with grid cell from 5 m to 200 m were generated using ANUDEM based on the 1∶10 000 digital topographic map.Different resolution slope gradients were extracted within the Arc/Info slope calculation methods.By applying terrain analysis and geostatistical methods,changes of DEM-derived slope with horizontal resolution and their spatial distribution were systematically investigated,both on point,line and surface level.Research shows that with DEM resolution decreasing,slope at single point shows uncertainty,while points at the same slope level change regularly-low slope terrain increases at first and then decreases,middle slope terrain shows slight changes,and steep slope terrain decreases with logarithm greatly.

关 键 词：分水线 流水线 沟沿线 半方差函数 

分 类 号：P208[天文地球—地图制图学与地理信息工程]