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：The SRTM (Shuttle RADAR Topographic Mission) which was flown in February 200 0 is the first mission using space-borne single- pass interferometric SAR. In this mission first simultaneous dual-polarization wide-swath ScanSAR dual frequency (C-band and X- band) interf erometric SAR have been used. The goal of the mission was to survey the Earth surface and to generate a homogeneous elevation data set of the wor ld with a grid spacing of 1 arcsec. Beside the American SIR -C, the German/Italian X-SAR system also was used on board. This paper deals with the accuracy assessment of the interferometric terrain evaluation data (DEM) from SR TM mission. The data was compared with reference to ground co ntrol points of dif ferential GPS measurements at three different types of terrain ranging from plain, moderately undulating and hilly region. Since the SRTM elevation values are or thometric height values in WGS84 datum, for the purpose comparing with DGPS co-ordinate were conver ted to WGS84 ellipsoidal value using EGM96 geoidal height model. The err or statistics was generated between DGPS measurements and SRTM WGS84 ellipsoidal heights and it was observed that for the plain ar ea like Ahmedabad (Gujarat) the errors were quite small (3.55m) whereas in the cases of moderately and hilly ter rain like Alwar (Rajasthan) and Chamoli (Uttaranchal) the RMS errors were of the order of 11.44m and 19.64m respectively. For the case of plain ter rain only ten GCPs were used whereas for the moderately and hilly terrain thirty GCPs each were used. Although DEM data of 90m is available for th e whole wor ld (with few gaps) but before one uses such freely available data, there is a need to check the accuracy associated with the type of application one is interested in
