ASTER立体像对提取玛尔挡坝区DEM及精度评价

Extraction and accuracy assessment of DEM on maerdang dam area from ASTER stereo image data

ASTER立体像对提取DEM已经成为近年来DEM提取研究的热点问题。本文基于ENVI软件,利用AS-TER立体像对提取青藏高原玛尔挡坝区DEM,并对其进行精度评价和误差来源分析。结果表明,利用ENVI软件提取ASTER-DEM方法可行,提取的DEM效果较好,能与地形图重叠,高程精度可达30m,而且地形较平坦地区精度高于地形陡峭地区;控制点的多少及精度、成像时的环境和气象条件、波段特性、影像空间分辨率等都影响着DEM的精度。

Extraction of DEM from ASTER stereo image data based on ENVI software is hot problem in recent years on DEM extracting research. This article extracts Maerdang dam area DEM from ASTER Stereo image data, assesses its accuracy, and analyses its errors source. Results indicate that, extraction of ASTER-DEM based on ENVI software is feasible; the DEM can overlay with topo- graphic map; the elevation accuracy, which in flat area is higher than in stee Parea, can reach to 30m on the whole. What affect accuracy of ASTER-DEM are numbers and accuracy of GCPS（ ground control points） , environment and weather condition on image production, wave band properties, image spatial resolution, etc.