EXTRACTION OF SUBSURFACE FEATURES FROM INSAR-DERIVED DIGITAL ELEVATION MODELS

摘要

Microwave remote sensing has the potential to be arnbeneficial tool to detect and analyse subsurface featuresrnin desert areas due to its penetration ability overrnhyperarid regions with extremely low loss and low bulkrnhumidity. Global Digital Elevation Models (DEMs) ofrnresolution up to 30 m are now publicly available, somernof which show subsurface features over these hyperaridrnareas. This study compares different elevations detectedrnby different EO microwave and lidar profilers andrndemonstrates their effectiveness in terms of extractionrnof subsurface features compared with that delineated inrnALOS/PALSAR polarisation map. Results show thatrnSRTM-C DEM agrees closely with ICESat elevationsrnand that SRTM-C DEM clearly show paleoriverrnfeatures, some of which can’t be observed inrnALOS/PALSAR images affected by backgroundrnbackscatter. However, craterlike features are morernrecognisable in ALOS/PALSAR images compared withrnSRTM-C DEM.