The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges
NASA s Ice, Cloud, and Land Elevation Satellite (ICESat) mission will be launched late 2001. It s primary instrument is the Geoscience Laser Altimeter System (GLAS) instrument. The main purpose of this instrument is to measure elevation changes of the Greenland and Antarctic icesheets. To accurately...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20130001652 2023-05-15T14:05:05+02:00 The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges Herring, Thomas A. Quinn, Katherine J. Unclassified, Unlimited, Publicly available October 2012 application/pdf http://hdl.handle.net/2060/20130001652 unknown Document ID: 20130001652 http://hdl.handle.net/2060/20130001652 Copyright, Distribution under U.S. Government purpose rights CASI Earth Resources and Remote Sensing NASA/TM-2012-208641/VOL8 GSFC-E-DAA-TN6085 2012 ftnasantrs 2019-07-21T06:18:40Z NASA s Ice, Cloud, and Land Elevation Satellite (ICESat) mission will be launched late 2001. It s primary instrument is the Geoscience Laser Altimeter System (GLAS) instrument. The main purpose of this instrument is to measure elevation changes of the Greenland and Antarctic icesheets. To accurately measure the ranges it is necessary to correct for the atmospheric delay of the laser pulses. The atmospheric delay depends on the integral of the refractive index along the path that the laser pulse travels through the atmosphere. The refractive index of air at optical wavelengths is a function of density and molecular composition. For ray paths near zenith and closed form equations for the refractivity, the atmospheric delay can be shown to be directly related to surface pressure and total column precipitable water vapor. For ray paths off zenith a mapping function relates the delay to the zenith delay. The closed form equations for refractivity recommended by the International Union of Geodesy and Geophysics (IUGG) are optimized for ground based geodesy techniques and in the next section we will consider whether these equations are suitable for satellite laser altimetry. Other/Unknown Material Antarc* Antarctic Greenland NASA Technical Reports Server (NTRS) Antarctic Greenland |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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unknown |
topic |
Earth Resources and Remote Sensing |
spellingShingle |
Earth Resources and Remote Sensing Herring, Thomas A. Quinn, Katherine J. The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges |
topic_facet |
Earth Resources and Remote Sensing |
description |
NASA s Ice, Cloud, and Land Elevation Satellite (ICESat) mission will be launched late 2001. It s primary instrument is the Geoscience Laser Altimeter System (GLAS) instrument. The main purpose of this instrument is to measure elevation changes of the Greenland and Antarctic icesheets. To accurately measure the ranges it is necessary to correct for the atmospheric delay of the laser pulses. The atmospheric delay depends on the integral of the refractive index along the path that the laser pulse travels through the atmosphere. The refractive index of air at optical wavelengths is a function of density and molecular composition. For ray paths near zenith and closed form equations for the refractivity, the atmospheric delay can be shown to be directly related to surface pressure and total column precipitable water vapor. For ray paths off zenith a mapping function relates the delay to the zenith delay. The closed form equations for refractivity recommended by the International Union of Geodesy and Geophysics (IUGG) are optimized for ground based geodesy techniques and in the next section we will consider whether these equations are suitable for satellite laser altimetry. |
format |
Other/Unknown Material |
author |
Herring, Thomas A. Quinn, Katherine J. |
author_facet |
Herring, Thomas A. Quinn, Katherine J. |
author_sort |
Herring, Thomas A. |
title |
The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges |
title_short |
The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges |
title_full |
The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges |
title_fullStr |
The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges |
title_full_unstemmed |
The Algorithm Theoretical Basis Document for the Atmospheric Delay Correction to GLAS Laser Altimeter Ranges |
title_sort |
algorithm theoretical basis document for the atmospheric delay correction to glas laser altimeter ranges |
publishDate |
2012 |
url |
http://hdl.handle.net/2060/20130001652 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland |
genre_facet |
Antarc* Antarctic Greenland |
op_source |
CASI |
op_relation |
Document ID: 20130001652 http://hdl.handle.net/2060/20130001652 |
op_rights |
Copyright, Distribution under U.S. Government purpose rights |
_version_ |
1766276722493227008 |