1 edition of Comparison of retracking algorithms using airborne radar and laser altimeter measurements of the Greenland ice sheet found in the catalog.
Shipping list no.: 99-0323.Microfiche. [Washington, D.C. : National Aeronautics and Space Administration, 1998] 1 microfiche.
|Statement||National Aeronautics and Space Administration|
|Publishers||National Aeronautics and Space Administration|
|The Physical Object|
|Pagination||xvi, 81 p. :|
|Number of Pages||90|
|2||NASA contractor report -- NASA CR-207160.|
|3||[NASA contractor report] -- 207160.|
nodata File Size: 1MB.
5 m in the datasets. The last is associated with the Antarctic Circumpolar Current, but the source of the northern variable regions is not clear. The altimeter data clearly reveal reasonable patterns of sea level transients associated with the western boundary currents and Antarctic Circumpolar Current. In 1991 and 1993, the AAFE altimeter took part in the NASA Multisensor Airborne Altimetry Experiments over Greenland, along with two NASA laser altimeters.
This method is not sensitive to changes in the scattering mechanisms of the ice sheet and it has the lowest noise level and bias of all the retracking methods presented. The results show that the observed temporal variation in the extinction coefficient from 1978 to 1985 is three times larger than the measured variability. The altimeter data verify and expand on the results of limited surface-based data sets, particularly in the case of the circulation transients south of Madagascar, and southwest of New Caledonia.
This procedure removes noise created by orbital uncertainty and permits study of sea level variations, without knowledge of the geoid. 3 million altimeter return waveforms from the Greenland and Antarctic ice sheets. The refurbished Advanced Application Flight Experiment AAFE airborne radar altimeter has a large range window and stores the entire return waveform during flight. Once the return waveforms are retracked, or post-processed to obtain the most accurate altitude measurement possible, they are compared with the high-precision Airborne….
Future investigations of ice-sheet mass balance using altimetry data should be aware of this possibility. The SRS approach and expected performance are described in this paper.
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The primary purpose for developing this algorithm is detection of ice-sheet elevation change, where it is critical that a retracking algorithm produce repeatable elevations.
This retracking algorithm can be used to assess the accuracy of elevations produced by current retracking algorithms, which do not account for subsurface volume scattering.
In addition, these results have important implications for the study of long-term elevation change over the ice sheets using altimeter data.