USING THE CRYOSAT INTERFEROMETRIC SWATH MODE FOR GLACIAL ICE TOPOGRAPHY

摘要

Digital Elevation Models (DEMs) have been createdrnusing interferometric swath mode data collected byrnCryosat 2 between Feb. 2011 and Jan. 2012 over thernwestern part of the Devon Ice Cap in Canada. Airbornernscanning laser data were compared with the DEMs andrnshowed a mean difference of a few meters with arnstandard deviation of order 1 m. The limitations of therntechnique, which generates ~ 2 orders of magnitudernmore data than traditional radar altimetry, are exploredrnthrough simulation. Notwithstanding the bias errors of arnfew meters that can arise with this approach, and thernlimitations in terms of along- and across-track slopes,rnthe value of swath mode processing is also illustrated byrnthe use of a DEM of part of the Mercer Ice Stream inrnAntarctica.