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：2002
卷号：XXXIV Part 4
出版社：Copernicus Publications
摘要：Mapping and monitoring the Earth's surface is subject to various application fields. This three-dimensional problem is usually split into a two-dimensional planar description of the Earth's surface supplemented with the height information provided as separate digi- tal elevation models. However, from the global point of view there is still a tremendous need for suitable height information at a resolution level of about 1 to 3 arc seconds. The Shuttle Radar Topography Mission (SRTM) will help to fill this gap by providing high quality digital elevation model (DEM). In order to provide terrain information for areas where either SRTM data will not be available or the corresponding resolution is not sufficient a combination with other sources will be required. The German Remote Sensing Data Center (DFD) of DLR intends to implement such a global DEM service. All SRTM/X-SAR data will be processed to elevation data and will serve as the backbone as it provides a global net of homogenous elevation information. This net can be used for the absolute orientation of other DEMs as geometric reference, but also for the improvement of the height quality by integrating elevation data from a variety of other sources by DEM fusion and mosaicking techniques. The paper describes the principles and corresponding accuracy of space borne missions for the derivation of DEMs. The main focus is on the DEM products of SRTM/X-SAR. Furthermore, the ERS-1/2 tandem configuration and the MOMS-2P mission are de- scribed. The technique to combine multi-source DEMs is outlined, which is based on the concept of height error maps. The method is illustrated by practical examples. Finally, an outlook is given on further investigations
关键词：Digital Elevation Model; SRTM; MOMS-2P; SAR-Interferometry; Stereo; Data Fusion
