等高线内插DEM算法的质量评价  

Quality Assessment on Different DEM Interpolation Algorithms Based on Contours

作　　者：兰玉芳[1,2] 徐霞[1] 胡英敏[1,2] 

机构地区：[1]北京师范大学地表过程与资源生态国家重点实验室,北京100875 [2]北京师范大学减灾与应急管理研究院,北京100875

出　　处：《地理与地理信息科学》2012年第4期25-28,F0002,共5页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(30900197);973重大科学计划项目(2011CB952001);中央高校基本科研业务费专项资金

摘　　要：以北方农牧交错带典型丘陵、山地及丘间盆地混合地带为研究区,利用国家测绘局提供的1∶5万地形图,比较ANUDEM方法与生成DEM常用的内插算法TIN、NNI、Kriging和IDW之间的精度。DEM质量评价采用数值精度指标验证,并辅以地形属性可视化分析、等高线分析和不同算法插值结果差异分析等,结果表明不同算法内插高程误差较大的区域主要分布在地形结构线附近;且ANUDEM方法生成的DEM精度较高,在其上提取的等高线与原始等高线吻合度高,能较好地反映研究区的真实地形。DEM has been widely used in describing geomorphologic structure,exploring hydrological and ecological processes.However,the errors generated from interpolation have a significant effect on DEM’s quality and even,and should reduce the credibility of products related to DEM.High qualified and accurate DEM is prerequisite for extracting information.Take a typical region in the farming-pasture zone of North China as the study area,including hilly region,mountain land and basin.Based on contours which were derived from the topographic maps with a scale of 1：50 000,the spatial interpolation accuracy of the ANUDEM method and other common interpolation algorithms of TIN,NNI,Kriging,and IDW was compared.Numerical precision indices,terrain visualization analysis and contour analysis were used to evaluate the quality of DEM obtained by different interpolation methods.The results showed that,the larger error of different interpolation methods exists at the nearby of the structure line of the terrain.DEM interpolated by ANUDEM is much more precise than the other interpolation algorithms,and the contours derived from it are the closest to the original contours,which can reflect the real terrain better.Following ANUDEM,TIN and NNI,as well paid attention to topography features.But the interpolation surface was quite coarse,and the hill-shading maps showed that there existed many flat-roofed phenomena on the ridge.Kriging method had the lowest accuracy,especially in complex geomorphologic zone.Although IDW method performed better than Kriging,the interpolation surface had obvious terrain ladder phenomenon.This study can contribute to obtaining high-accurate DEM in complex geomorphologic zones.

关 键 词：等高线 DEM ANUDEM 内插 质量评价 

分 类 号：P208[天文地球—地图制图学与地理信息工程]