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-1/W41
出版社：Copernicus Publications
摘要：GTOPO30 is a global DEM regularly spaced at 30-arc seconds (approximately 1 kilometer) covering the full extent of latitude from 90 degrees south to 90 degrees north, and the full extent of longitude from 180 degrees west to 180 degrees east. However, 1- kilometer spatial resolution is not enough for many projects. In this case, real alternative for the important projects is the DEMs from SRTM mission, which was flown as 11 days mission in 2000. This mission provides a global DEM using two interferometric SAR (InSAR) systems operating simultaneously in X and C band for areas within the geographic latitudes of 60°N and 58°S. The C-band 3-arc second (90 m) data set is being processed by JPL for the archives of NIMA and the NASA. The X-band 1-arc second (30 m) data set is processed and distributed by DLR, Germany. In this study, geometric accuracy and morphological analyses of the GTOPO30 and interferometric DEMs derived from the C and X band -SAR systems have been carried out over the Istanbul testfield with undulating terrain and moderate height range using the reference DEM digitized from the topographic maps of 1:25000 scale. For both interferometric DEMs produced almost similar accuracy results with the range of 6.5 m to 7.5 m. The obtained accuracy for the GTOPO30 was in the range of 15.9 m to 16.8 m for open and forest area. Accuracy of SRTM X and C-band DEMs were also checked against the GCPs measured by GPS campaigns and rmse-Z values were found to be about 5.6 m and 9.6 m for X- and C- band respectively under the estimation of 10 % mean slope value
