Aster DEM 数据与1∶50000地面高程库数据的精度比较分析

摘要

ASTER DEM is produced by a stereo image pairs take by ASTER -a high resolution satellite .They cover most of the glob-al, and can rapid acquire data, and the quality is stable.However, its data accuracy and quality have some indetermination in our country district.ASTER DEM of Typical physiognomy character in Qinling containing high mountain and valley is selected , comparing with 1∶50 000 national digital elevation data , during collectivity statistic , reference point method and section plane method , the preci-sion of ASTER DEM is experimented and analyzed .The result shows that comparing with 1∶50 000 national digital elevation data , the error corresponding numerical value data distributing present normal distribution , the RMSE is 30.109358028165158 meters;the ele-vation value of the peak is lower , and the elevation value of the valley is higher .%ASTER DEM是利用高分辨率卫星成像设备ASTER获取的立体影像生成的DEM，其全球覆盖范围较广、数据获取快、质量稳定。但其数据精度和质量在我国区域内存在较多不确定性，本文选取具有高山峡谷等典型地貌特征的秦岭山区的ASTER DEM数据，以相应1∶50000地面高程库数据作参照，从总体统计、检查点法以及剖面法几个方面对其精度进行了实验与分析。结果表明，与地面1∶50000地面高程库相比，ASTER DEM误差值所对应的点数数据分布呈正态分布，RMSE为30．109358028165158 m；且其在山峰上的高程值会有所降低，在山谷中的高程值会有所增加。