Arcsecond-level pointing calibration for ICESat laser altimetry of ice sheets |
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| Authors: | M E Lisano B E Schutz |
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| Institution: | (1) Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA, e-mail: mike.lisano@jpl.nasa.gov Tel.: 818 354 0765; Fax: 818 393 6388, US;(2) Center for Space Research, University of Texas at Austin, Austin, TX, USA, e-mail: schutz@csr.utexas.edu Tel.: 512 471 4267, US |
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| Abstract: | Arcsecond-level accuracy of NASA's ICESat (Ice, Cloud, and land Elevation Satellite) satellite laser altimeter beam pointing
angle is required to satisfy the scientific goal of detecting centimeter-level elevation changes, over time, in the Greenland
and Antarctic ice sheets. Two different approaches, termed “topographic inferred” and “direct detection”, were examined for
calibrating the laser pointing angle (that is, detecting and removing pointing determination bias) at the 1.5-arcsec level,
using information independent of the onboard pointing instrumentation. Both approaches entail estimating the beam pointing
by differencing the three-dimensional position of the altimeter instrument and the laser-beam spot (or “footprint”) location
on the ground. Analytical assessments of the two approaches are discussed, along with recommendations for the ICESat pointing
determination calibration strategy.
Received: 28 April 2000 / Accepted: 6 November 2000 |
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| Keywords: | : ICESat GLAS Calibration Pointing determination Ice-sheet altimetry |
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