Technical report: SRTM DEM updating using selected InSAR DEM elevations based on coherence value selection method

摘要

The Shuttle Radar Topography Mission (SRTM) was revolutionary because it generated global digital elevation model (DEM) using space-borne radar imaging technology. The SRTM mapped almost 80 percent of the Earth's surface to a 1-arc-second (～30 m) resolution, but generated a lower resolution 3-arc-second (～90 m) DEM. Currently, the low resolution SRTM DEM is updated and interpolated using other higher resolution DEMs obtained from different sources or techniques, such as InSAR, photogrammetry, and airborne laser scanning. Of the many DEM techniques, the InSAR DEM generation technique is recommended due to the large-coverage and the fact that it is a similar technique to that used for the SRTM DEM. This paper describes a method for updating the SRTM DEM, using InSAR DEM based on the coherence value selection method.