Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.550e..29r&link_type=abstract
Proceedings of the FRINGE 2003 Workshop (ESA SP-550). 1-5 December 2003, ESA/ESRIN, Frascati, Italy. Editor: H. Lacoste. Publish
Physics
Scientific paper
The feasibility for retrieving the mass of snow on ground (the snow water equivalent, SWE) by means of repeat-pass SAR interferometry has been investigated. Because the SAR signal of ground covered by dry snow is dominated by backscatter from the snow/ground interface, the differential phase shift due to propagation in the snow can be directly related to SWE. The factors of relevance for coherence of snow covered areas were studied by theoretical modeling and analysis of repeat pass SAR data, showing that the C-band coherence often deteriorates rapidly in case of snow fall whereas coherence is much better preserved at L-band. Case studies on SWE retrieval are presented for 3-day repeat- pass ERS SAR data of the Austrian Alps and 4-month repeat-pass L-band airborne SAR data of Oberpfaffenhofen. The investigations confirm the potential of repeat-pass InSAR data for mapping SWE with high spatial detail, suggesting clear preference for L-band. For fully assessing the InSAR capabilities for SWE retrieval, dedicated experiments with co-located, spatially detailed field measurements need to be carried out.
Nagler Th.
Rott Helmut
Scheiber R.
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