Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data
NASA’s Ice, Cloud and land Elevation Satellite ICESat-2, launched September 15, 2018, carries the first space-borne multi-beam micro-pulse photon-counting laser altimeter system, the Advanced Topographic Laser Altimeter System (ATLAS). Observations from ATLAS are acquired in three pairs of weak and...
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ftdoajarticles:oai:doaj.org/article:9b5dfe9181534dd38e91c043d3f9227d 2023-05-15T16:21:33+02:00 Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data Ute C. Herzfeld Thomas Trantow Matthew Lawson Jacob Hans Gavin Medley 2021-06-01T00:00:00Z https://doi.org/10.1016/j.srs.2020.100013 https://doaj.org/article/9b5dfe9181534dd38e91c043d3f9227d EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2666017220300122 https://doaj.org/toc/2666-0172 2666-0172 doi:10.1016/j.srs.2020.100013 https://doaj.org/article/9b5dfe9181534dd38e91c043d3f9227d Science of Remote Sensing, Vol 3, Iss , Pp 100013- (2021) Laser altimetry Density-dimension algorithm ICESat-2 Glaciology Glacier surging Planet SkySat imagery Physical geography GB3-5030 Science Q article 2021 ftdoajarticles https://doi.org/10.1016/j.srs.2020.100013 2022-12-31T06:52:12Z NASA’s Ice, Cloud and land Elevation Satellite ICESat-2, launched September 15, 2018, carries the first space-borne multi-beam micro-pulse photon-counting laser altimeter system, the Advanced Topographic Laser Altimeter System (ATLAS). Observations from ATLAS are acquired in three pairs of weak and strong beams with 0.7 m nominal along-track spacing (under clear-sky conditions). The recording of the observations as a photon point cloud, which includes signal and background/noise events, requires a dedicated algorithm for identification of signal photons and determination of surface heights. The objectives of this paper are to demonstrate that measurements from ICESat-2 allow determination of heights over heavily crevassed ice surfaces and yield elevation profiles that present morphological characteristics that are typical of fast-moving and accelerating glaciers. Surface-height determination from the photon point cloud is facilitated by the density-dimension algorithm for ice surfaces, the DDA-ice. The DDA-ice returns surface heights at the 0.7 m sensor resolution for strong and weak beams, it utilizes a radial basis function for data aggregation and automatically adapts to changing environmental conditions and background characteristics, including time of day and apparent surface reflectance. In contrast, the official Land-Ice Along-Track Height Product, ATL06, provides surface heights at 40 m resolution with 20 m postings. The DDA-ice signal classification consistently identifies photons from complex reflectors in both the strong and weak ATLAS beams and hence constitutes a significant advance over the signal classification on the ATL03 Global Geolocated Photons Product. Results are evaluated using (1) airborne laser altimeter data collected during our ICESat-2 validation campaign over Negribreen, Svalbard, during surge, and (2) high-resolution (0.72 m or 0.86 m) satellite image data from Planet SkySat acquired over Ilulissat Ice Stream (Jakobshavn Isbræ), Greenland. Using DDA-ice analysis, ICESat-2 data allow ... Article in Journal/Newspaper glacier glacier Greenland Ilulissat Jakobshavn Jakobshavn isbræ Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Greenland Ilulissat ENVELOPE(-51.099,-51.099,69.220,69.220) Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) Negribreen ENVELOPE(19.150,19.150,78.564,78.564) Science of Remote Sensing 3 100013 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Laser altimetry Density-dimension algorithm ICESat-2 Glaciology Glacier surging Planet SkySat imagery Physical geography GB3-5030 Science Q |
spellingShingle |
Laser altimetry Density-dimension algorithm ICESat-2 Glaciology Glacier surging Planet SkySat imagery Physical geography GB3-5030 Science Q Ute C. Herzfeld Thomas Trantow Matthew Lawson Jacob Hans Gavin Medley Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data |
topic_facet |
Laser altimetry Density-dimension algorithm ICESat-2 Glaciology Glacier surging Planet SkySat imagery Physical geography GB3-5030 Science Q |
description |
NASA’s Ice, Cloud and land Elevation Satellite ICESat-2, launched September 15, 2018, carries the first space-borne multi-beam micro-pulse photon-counting laser altimeter system, the Advanced Topographic Laser Altimeter System (ATLAS). Observations from ATLAS are acquired in three pairs of weak and strong beams with 0.7 m nominal along-track spacing (under clear-sky conditions). The recording of the observations as a photon point cloud, which includes signal and background/noise events, requires a dedicated algorithm for identification of signal photons and determination of surface heights. The objectives of this paper are to demonstrate that measurements from ICESat-2 allow determination of heights over heavily crevassed ice surfaces and yield elevation profiles that present morphological characteristics that are typical of fast-moving and accelerating glaciers. Surface-height determination from the photon point cloud is facilitated by the density-dimension algorithm for ice surfaces, the DDA-ice. The DDA-ice returns surface heights at the 0.7 m sensor resolution for strong and weak beams, it utilizes a radial basis function for data aggregation and automatically adapts to changing environmental conditions and background characteristics, including time of day and apparent surface reflectance. In contrast, the official Land-Ice Along-Track Height Product, ATL06, provides surface heights at 40 m resolution with 20 m postings. The DDA-ice signal classification consistently identifies photons from complex reflectors in both the strong and weak ATLAS beams and hence constitutes a significant advance over the signal classification on the ATL03 Global Geolocated Photons Product. Results are evaluated using (1) airborne laser altimeter data collected during our ICESat-2 validation campaign over Negribreen, Svalbard, during surge, and (2) high-resolution (0.72 m or 0.86 m) satellite image data from Planet SkySat acquired over Ilulissat Ice Stream (Jakobshavn Isbræ), Greenland. Using DDA-ice analysis, ICESat-2 data allow ... |
format |
Article in Journal/Newspaper |
author |
Ute C. Herzfeld Thomas Trantow Matthew Lawson Jacob Hans Gavin Medley |
author_facet |
Ute C. Herzfeld Thomas Trantow Matthew Lawson Jacob Hans Gavin Medley |
author_sort |
Ute C. Herzfeld |
title |
Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data |
title_short |
Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data |
title_full |
Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data |
title_fullStr |
Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data |
title_full_unstemmed |
Surface heights and crevasse morphologies of surging and fast-moving glaciers from ICESat-2 laser altimeter data - Application of the density-dimension algorithm (DDA-ice) and evaluation using airborne altimeter and Planet SkySat data |
title_sort |
surface heights and crevasse morphologies of surging and fast-moving glaciers from icesat-2 laser altimeter data - application of the density-dimension algorithm (dda-ice) and evaluation using airborne altimeter and planet skysat data |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://doi.org/10.1016/j.srs.2020.100013 https://doaj.org/article/9b5dfe9181534dd38e91c043d3f9227d |
long_lat |
ENVELOPE(-51.099,-51.099,69.220,69.220) ENVELOPE(-49.917,-49.917,69.167,69.167) ENVELOPE(19.150,19.150,78.564,78.564) |
geographic |
Svalbard Greenland Ilulissat Jakobshavn Isbræ Negribreen |
geographic_facet |
Svalbard Greenland Ilulissat Jakobshavn Isbræ Negribreen |
genre |
glacier glacier Greenland Ilulissat Jakobshavn Jakobshavn isbræ Svalbard |
genre_facet |
glacier glacier Greenland Ilulissat Jakobshavn Jakobshavn isbræ Svalbard |
op_source |
Science of Remote Sensing, Vol 3, Iss , Pp 100013- (2021) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2666017220300122 https://doaj.org/toc/2666-0172 2666-0172 doi:10.1016/j.srs.2020.100013 https://doaj.org/article/9b5dfe9181534dd38e91c043d3f9227d |
op_doi |
https://doi.org/10.1016/j.srs.2020.100013 |
container_title |
Science of Remote Sensing |
container_volume |
3 |
container_start_page |
100013 |
_version_ |
1766009551062040576 |