ENVISAT SAR sensor (ASAR) uses a slightly different radar frequency when compared to the ERS-2 SAR sensor. Accordingly ASAR data can not be combined with ERS-2 data via conventional InSAR technique. A technique, called cross-platform InSAR (CPInSAR) is being developed to manipulate SAR signals from two different sensors to generate a DEM. Under favorable imaging geometry conditions and terrain types, the accuracy of the CPInSAR-derived DEM can reach tens of centimeters - better than SRTM and comparable to Lidar.
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