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Comparison of radar-altimetry data over Greenland with surface topography derived from airborne laser altimetryDuring the Summers of 1991, 1992, and 1993, NASA flew a scanning laser altimeter over transects of the Greenland ice sheet. Airplane location was measured precisely using differential Global Positioning System (GPS) surveying techniques. This allowed all altimetry data to be reduced to an estimate of ice surface elevations relative to the Earth ellipsoid. Repeat flights over the same areas indicate data consistency to 10 to 20 cm. Many of the aircraft flights were made along the ERS-1 'radar-altimeter footprint track' for a commissioning phase orbit. Rigorous comparison between the ERS-1 altimeter measurements and those from the laser altimeter will require analysis of individual ERS-1 altimeter waveforms, and since the information needed to do this is not yet available, results from comparison of TOPEX (Topology Ocean Experiment) Poseidon (T/P) radar altimetry data with laser data obtained at the northernmost limit of the T/P orbits are presented.
Document ID
Document Type
Conference Paper
Thomas, R. H.
(NASA Headquarters Washington, DC United States)
Krabill, W.
(NASA Headquarters Washington, DC United States)
Manizade, S.
(NASA Headquarters Washington, DC United States)
Swift, R.
(NASA Headquarters Washington, DC United States)
Brenner, A.
(NASA Headquarters Washington, DC United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1994
Publication Information
Publication: ESA, Proceedings of the Second ERS-1 Symposium on Space at the Service of Our Environment, Volume 1
Subject Category
Earth Resources And Remote Sensing
Accession Number
Distribution Limits
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