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The National Imagery and Mapping Agency (NIMA) is at the forefront of using the techniques of Interferometric Synthetic Aperture Radar (IFSAR) for the production of large volumes of digital elevation models. Two NIMA-sponsored programs, one space- borne and one air-borne, have had very positive results in 2002. These are the Shuttle Radar Topography Mission (SRTM) and the Geographic Synthetic Aperture Radar (GeoSAR). 相似文献