GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking
Glacier velocity measurements are essential to understand ice flow mechanics, monitor natural hazards, and make accurate projections of future sea-level rise. Despite these important applications, the method most commonly used to derive glacier velocity maps, feature tracking, relies on empirical pa...
Main Authors: | , , , , , , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-2023-38 https://tc.copernicus.org/preprints/tc-2023-38/ |
id |
ftcopernicus:oai:publications.copernicus.org:tcd109937 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tcd109937 2023-05-15T16:22:27+02:00 GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking Zheng, Whyjay Bhushan, Shashank Wyk De Vries, Maximillian Kochtitzky, William Shean, David Copland, Luke Dow, Christine Jones-Ivey, Renette Pérez, Fernando 2023-04-04 application/pdf https://doi.org/10.5194/tc-2023-38 https://tc.copernicus.org/preprints/tc-2023-38/ eng eng doi:10.5194/tc-2023-38 https://tc.copernicus.org/preprints/tc-2023-38/ eISSN: 1994-0424 Text 2023 ftcopernicus https://doi.org/10.5194/tc-2023-38 2023-04-10T16:23:11Z Glacier velocity measurements are essential to understand ice flow mechanics, monitor natural hazards, and make accurate projections of future sea-level rise. Despite these important applications, the method most commonly used to derive glacier velocity maps, feature tracking, relies on empirical parameter choices that rarely account for glacier physics or uncertainty. Here we test two statistics- and physics-based metrics to assess velocity maps from a range of existing feature-tracking workflows at Kaskawulsh Glacier, Canada. Based on inter-comparisons with ground-truth data, velocity maps with metrics falling within our recommended ranges contain fewer erroneous measurements and more spatially correlated noise than velocity maps with metrics that deviate from those ranges. Thus, these metric ranges are suitable for refining feature-tracking workflows and evaluating the resulting velocity products. We have released an open-source software package for computing and visualizing these metrics, the GLAcier Feature Tracking testkit (GLAFT). Text glacier* Copernicus Publications: E-Journals Canada Kaskawulsh Glacier ENVELOPE(-139.104,-139.104,60.749,60.749) |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Glacier velocity measurements are essential to understand ice flow mechanics, monitor natural hazards, and make accurate projections of future sea-level rise. Despite these important applications, the method most commonly used to derive glacier velocity maps, feature tracking, relies on empirical parameter choices that rarely account for glacier physics or uncertainty. Here we test two statistics- and physics-based metrics to assess velocity maps from a range of existing feature-tracking workflows at Kaskawulsh Glacier, Canada. Based on inter-comparisons with ground-truth data, velocity maps with metrics falling within our recommended ranges contain fewer erroneous measurements and more spatially correlated noise than velocity maps with metrics that deviate from those ranges. Thus, these metric ranges are suitable for refining feature-tracking workflows and evaluating the resulting velocity products. We have released an open-source software package for computing and visualizing these metrics, the GLAcier Feature Tracking testkit (GLAFT). |
format |
Text |
author |
Zheng, Whyjay Bhushan, Shashank Wyk De Vries, Maximillian Kochtitzky, William Shean, David Copland, Luke Dow, Christine Jones-Ivey, Renette Pérez, Fernando |
spellingShingle |
Zheng, Whyjay Bhushan, Shashank Wyk De Vries, Maximillian Kochtitzky, William Shean, David Copland, Luke Dow, Christine Jones-Ivey, Renette Pérez, Fernando GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking |
author_facet |
Zheng, Whyjay Bhushan, Shashank Wyk De Vries, Maximillian Kochtitzky, William Shean, David Copland, Luke Dow, Christine Jones-Ivey, Renette Pérez, Fernando |
author_sort |
Zheng, Whyjay |
title |
GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking |
title_short |
GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking |
title_full |
GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking |
title_fullStr |
GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking |
title_full_unstemmed |
GLAcier Feature Tracking testkit (GLAFT): A statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking |
title_sort |
glacier feature tracking testkit (glaft): a statistically- and physically-based framework for evaluating glacier velocity products derived from satellite image feature tracking |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-2023-38 https://tc.copernicus.org/preprints/tc-2023-38/ |
long_lat |
ENVELOPE(-139.104,-139.104,60.749,60.749) |
geographic |
Canada Kaskawulsh Glacier |
geographic_facet |
Canada Kaskawulsh Glacier |
genre |
glacier* |
genre_facet |
glacier* |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2023-38 https://tc.copernicus.org/preprints/tc-2023-38/ |
op_doi |
https://doi.org/10.5194/tc-2023-38 |
_version_ |
1766010419987611648 |