期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2006
卷号：XXXVI Part 4
出版社：Copernicus Publications
摘要：In the present paper, the position and elevation accuracy assessment of SRTM C-band DEM (90 m resolution) has been evaluated. An accurate aerial photogrammetric DEM and orthophoto have been used as reference data. The aerial DEM is generated using conventional photgrammetric methods by incorporating break lines and mass points. The aerial DEM at 25 m posting interval and aerial orthophoto 0.25 m resolution are generated in WGS-84 ellipsoid, UTM projection. The aerial DEM 25 m is resampled to 90 m posting interval for comparsion with SRTM DEM. The validation of SRTM DEM is carried out by three methods viz. Contour Validation, Profile Validation and DEM Differencing A positional bias of 100 m and vertical accuracy of 8 m linear error (LE90) have been observed. Further, the utility of the SRTM DEM has been studied for orthorectification of medium resolution IRS-PAN 5 m data and high resolution Ikonos 1m data. The validation of IRS- PAN orthoimage is carried out by comparing it with the coordinated from aerial orthophoto. The validation of Ikonos orthoimage is carried out by comparing the coordinates of DGPS derived control points. In both cases, the outputs have met the requirements for base mapping at 1:25,000 and 1:10,000 scale respectively
