Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission
The greatest changes in elevation in Greenland and Antarctica are happening along the margins of the ice sheets where the surface frequently has significant slopes. For this reason, the upcoming Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission utilizes pairs of laser altimeter beams tha...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20140010293 2023-05-15T13:07:35+02:00 Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission Neumann, Thomas Allen Walsh, Kaitlin M. Brunt, Kelly M. Markus, Thorsten Unclassified, Unlimited, Publicly available [2013] application/pdf http://hdl.handle.net/2060/20140010293 unknown Document ID: 20140010293 http://hdl.handle.net/2060/20140010293 Copyright, Distribution as joint owner in the copyright CASI Earth Resources and Remote Sensing Geosciences (General) GSFC-E-DAA-TN10612 2013 ftnasantrs 2019-07-21T06:14:17Z The greatest changes in elevation in Greenland and Antarctica are happening along the margins of the ice sheets where the surface frequently has significant slopes. For this reason, the upcoming Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission utilizes pairs of laser altimeter beams that are perpendicular to the flight direction in order to extract slope information in addition to elevation. The Multiple Altimeter Beam Experimental Lidar (MABEL) is a high-altitude airborne laser altimeter designed as a simulator for ICESat-2. The MABEL design uses multiple beams at fixed angles and allows for local slope determination. Here, we present local slopes as determined by MABEL and compare them to those determined by the Airborne Topographic Mapper (ATM) over the same flight lines in Greenland. We make these comparisons with consideration for the planned ICESat-2 beam geometry. Results indicate that the mean slope residuals between MABEL and ATM remain small (< 0.05 degrees) through a wide range of localized slopes using ICESat-2 beam geometry. Furthermore, when MABEL data are subsampled by a factor of 4 to mimic the planned ICESat-2 transmit-energy configuration, the results are indistinguishable from the full-data-rate analysis. Results from MABEL suggest that ICESat-2 beam geometry and transmit-energy configuration are appropriate for the determination of slope on approx. 90-m spatial scales, a measurement that will be fundamental to deconvolving the effects of surface slope from the ice-sheet surface change derived from ICESat-2. Other/Unknown Material Airborne Topographic Mapper Antarc* Antarctica Greenland Ice Sheet NASA Technical Reports Server (NTRS) Greenland Mabel ENVELOPE(-44.683,-44.683,-60.667,-60.667) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Earth Resources and Remote Sensing Geosciences (General) |
spellingShingle |
Earth Resources and Remote Sensing Geosciences (General) Neumann, Thomas Allen Walsh, Kaitlin M. Brunt, Kelly M. Markus, Thorsten Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission |
topic_facet |
Earth Resources and Remote Sensing Geosciences (General) |
description |
The greatest changes in elevation in Greenland and Antarctica are happening along the margins of the ice sheets where the surface frequently has significant slopes. For this reason, the upcoming Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission utilizes pairs of laser altimeter beams that are perpendicular to the flight direction in order to extract slope information in addition to elevation. The Multiple Altimeter Beam Experimental Lidar (MABEL) is a high-altitude airborne laser altimeter designed as a simulator for ICESat-2. The MABEL design uses multiple beams at fixed angles and allows for local slope determination. Here, we present local slopes as determined by MABEL and compare them to those determined by the Airborne Topographic Mapper (ATM) over the same flight lines in Greenland. We make these comparisons with consideration for the planned ICESat-2 beam geometry. Results indicate that the mean slope residuals between MABEL and ATM remain small (< 0.05 degrees) through a wide range of localized slopes using ICESat-2 beam geometry. Furthermore, when MABEL data are subsampled by a factor of 4 to mimic the planned ICESat-2 transmit-energy configuration, the results are indistinguishable from the full-data-rate analysis. Results from MABEL suggest that ICESat-2 beam geometry and transmit-energy configuration are appropriate for the determination of slope on approx. 90-m spatial scales, a measurement that will be fundamental to deconvolving the effects of surface slope from the ice-sheet surface change derived from ICESat-2. |
format |
Other/Unknown Material |
author |
Neumann, Thomas Allen Walsh, Kaitlin M. Brunt, Kelly M. Markus, Thorsten |
author_facet |
Neumann, Thomas Allen Walsh, Kaitlin M. Brunt, Kelly M. Markus, Thorsten |
author_sort |
Neumann, Thomas Allen |
title |
Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission |
title_short |
Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission |
title_full |
Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission |
title_fullStr |
Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission |
title_full_unstemmed |
Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission |
title_sort |
determination of local slope on the greenland ice sheet using a multibeam photon-counting lidar in preparation for the icesat-2 mission |
publishDate |
2013 |
url |
http://hdl.handle.net/2060/20140010293 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-44.683,-44.683,-60.667,-60.667) |
geographic |
Greenland Mabel |
geographic_facet |
Greenland Mabel |
genre |
Airborne Topographic Mapper Antarc* Antarctica Greenland Ice Sheet |
genre_facet |
Airborne Topographic Mapper Antarc* Antarctica Greenland Ice Sheet |
op_source |
CASI |
op_relation |
Document ID: 20140010293 http://hdl.handle.net/2060/20140010293 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766060421920325632 |