Physics – Geophysics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j.131n&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 10, pp. 131-1, CiteID 1493, DOI 10.1029/2001GL014015
Physics
Geophysics
Exploration Geophysics: Data Processing, Geodesy And Gravity: Space Geodetic Surveys, Geodesy And Gravity: Instruments And Techniques, Geodesy And Gravity: General Or Miscellaneous
Scientific paper
Wingham [1993] demonstrated that migration of radar waveforms appears to improve the images of ice sheet topography. We examine whether this qualitative improvement might lead to quantitative benefits in measuring ice sheet elevation change. We find, instead, that estimates based on migrated waveforms at cross-over points are degraded relative to unmigrated waveforms. Lack of cross-track data, which would allow true 3D migration, and migration ``noise'' related to the Kirchoff algorithm are likely contributors to the degradation. Additionally, lack of phase information in radar waveforms degrades the result. This problem is not encountered in seismic applications of migration and is a limitation of the current generation of radar altimeter data. We have not investigated whether other quantitative benefits may be derived from migrating altimeter waveforms. For example, improved resolution of smaller scale topography in migrated data may lead to better quantitative understanding of ice sheet dynamics.
Nuth Van
Pulliam Jay
Wilson Clark
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