利用共线方程的ALOS DEM制作误差分析

Error Analysis of Digital Elevation Model Generation based on Collinearity Equation

卫星遥感是获取DEM数据的重要手段,定量化和降低DEM数据误差是应用DEM数据的前提。在共线方程理论的基础上,模拟分析了DEM数据精度与内外方位元素之间的定量关系,以覆盖鄱阳湖地区的ALOS PRISM立体像对为研究数据,根据SRTM数据计算DEM误差,并求解影像内外方位元素误差。研究表明:影像角度误差是影响DEM误差的主要因素。消除角度元素误差后,DEM数据误差的均值由4.4m降为0.2m,标准差由7.7m降为2.7m。

Satellite remote sensing provides tion of DEM error serves as an important effects of Interior based on collineari important means for DEM generation. Quantification and reduc- prerequisite for reliable use of DEM data. For this purpose, the and Exterior Orientation Parameters （IOPs and EOPs） on DEM accuracy are simulated ty equation. Subsequently,errors associated with IOPs and EOPs are calculated with ref- erence to SRTM （Shuttle Radar Topography Misson） data,by using stereo imageries covering Poyang lake area. The result shows that angular errors are the major contributors to DEM error. The mean DEM error would be reduced from 4.4 m to 0.2 m,and the standard error would be reduced from 7. 7 m to 2.7 m without angular errors.