AUTOMATIC EXTRACTION OF ICE-­CAP LAYERS FROM RADAR SOUNDING DATA OVER GREENLAND AND THE SOUTH POLAR RESIDUAL CAP ON MARS

摘要

Radar depth sounding employs low frequency radar operating at several hundredsrnof KiloHz to MegaHz frequencies and has been applied to the field of subsurfacerninvestigations on both the Earth and Mars.rnOver Antarctica and Greenland, the Multichannel Coherent Radar Depth Sounderrn(MCoRDS) onboard the NASA Operation IceBridge missions[1] has collected radarrnechograms since 2009 showing the subsurface ice layers caused by icernaccumulation and interrupted by subsurface ice flow. Over the Martian polarrnregions, subsurface layers are also detected by low frequency radar systems, i.e.rnMARSIS (Mars Advanced Radar for Subsurface Ionosphere Sounding on board ESA’srnMars Express) and SHARAD (SHAllow subsurface RADar on board NASA’s MarsrnReconnaissance Orbiter) [2]–[5].rnAlthough these subsurface layers are formed by different mechanisms, there is arnneed for fast and automatic information extraction from these subsurface radarrnreflectors with the larger and larger coverage acquired nowadays. The detectionrnand automatic extraction of subsurface layers is very important preliminary work tornfuture studies of surface evolution and past climate. This study presents a methodrnbased on the Radon Transform (RT) to automatically extract the subsurface layersrnover Greenland on Earth and South Polar Residual Cap on Mars.