Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product
The NASA MEaSUREs Inter-mission Time Series of Land Ice Velocity and Elevation (ITS_LIVE) project seeks to accelerate understanding of critical glaciers and ice sheet processes by providing researchers with global, low-latency, comprehensive and state-of-the-art records of surface velocities and ele...
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ftcopernicus:oai:publications.copernicus.org:essdd98867 2023-05-15T16:40:33+02:00 Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product Lei, Yang Gardner, Alex S. Agram, Piyush 2021-12-14 application/pdf https://doi.org/10.5194/essd-2021-393 https://essd.copernicus.org/preprints/essd-2021-393/ eng eng doi:10.5194/essd-2021-393 https://essd.copernicus.org/preprints/essd-2021-393/ eISSN: 1866-3516 Text 2021 ftcopernicus https://doi.org/10.5194/essd-2021-393 2021-12-20T17:22:31Z The NASA MEaSUREs Inter-mission Time Series of Land Ice Velocity and Elevation (ITS_LIVE) project seeks to accelerate understanding of critical glaciers and ice sheet processes by providing researchers with global, low-latency, comprehensive and state-of-the-art records of surface velocities and elevations as observed from space. Here we describe the image-pair ice velocity product and processing methodology for ESA Sentinel-1 radar data. We demonstrate improvements to the core processing algorithm for dense offset tracking, “autoRIFT”, that provides finer resolution and higher accuracy data products with improved computational efficiency when compared to earlier versions. A novel calibration is applied to the data to correct for Sentinel-1A/B subswath- and full swath-dependent geolocation errors caused by systematic issues with the instruments. Sentinel-1’s C-band images are affected by variations in the total electron content of the ionosphere that results in large velocity errors in the azimuth (along-track) direction. To reduce these effects slant-range (line-of-sight or LOS) velocities are used and accompanied by LOS parameters that support map coordinate (x/y) velocity inversion from ascending and descending slant-range offset measurements, as derived from 2 image-pairs. The described product and methods comprise the MEaSUREs ITS_LIVE Sentinel-1 Image-Pair Glacier and Ice Sheet Surface Velocities: Version 2 ( https://its-live.jpl.nasa.gov ). Text Ice Sheet Copernicus Publications: E-Journals |
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English |
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The NASA MEaSUREs Inter-mission Time Series of Land Ice Velocity and Elevation (ITS_LIVE) project seeks to accelerate understanding of critical glaciers and ice sheet processes by providing researchers with global, low-latency, comprehensive and state-of-the-art records of surface velocities and elevations as observed from space. Here we describe the image-pair ice velocity product and processing methodology for ESA Sentinel-1 radar data. We demonstrate improvements to the core processing algorithm for dense offset tracking, “autoRIFT”, that provides finer resolution and higher accuracy data products with improved computational efficiency when compared to earlier versions. A novel calibration is applied to the data to correct for Sentinel-1A/B subswath- and full swath-dependent geolocation errors caused by systematic issues with the instruments. Sentinel-1’s C-band images are affected by variations in the total electron content of the ionosphere that results in large velocity errors in the azimuth (along-track) direction. To reduce these effects slant-range (line-of-sight or LOS) velocities are used and accompanied by LOS parameters that support map coordinate (x/y) velocity inversion from ascending and descending slant-range offset measurements, as derived from 2 image-pairs. The described product and methods comprise the MEaSUREs ITS_LIVE Sentinel-1 Image-Pair Glacier and Ice Sheet Surface Velocities: Version 2 ( https://its-live.jpl.nasa.gov ). |
format |
Text |
author |
Lei, Yang Gardner, Alex S. Agram, Piyush |
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Lei, Yang Gardner, Alex S. Agram, Piyush Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product |
author_facet |
Lei, Yang Gardner, Alex S. Agram, Piyush |
author_sort |
Lei, Yang |
title |
Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product |
title_short |
Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product |
title_full |
Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product |
title_fullStr |
Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product |
title_full_unstemmed |
Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product |
title_sort |
processing methodology for the its_live sentinel-1 ice velocity product |
publishDate |
2021 |
url |
https://doi.org/10.5194/essd-2021-393 https://essd.copernicus.org/preprints/essd-2021-393/ |
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Ice Sheet |
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Ice Sheet |
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eISSN: 1866-3516 |
op_relation |
doi:10.5194/essd-2021-393 https://essd.copernicus.org/preprints/essd-2021-393/ |
op_doi |
https://doi.org/10.5194/essd-2021-393 |
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1766030960701210624 |