Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification
Surface meltwater generated on ice shelves fringing the Antarctic Ice Sheet can drive ice-shelf collapse, leading to ice sheet mass loss and contributing to global sea level rise. A quantitative assessment of supraglacial lake evolution is required to understand the influence of Antarctic surface me...
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ftunivmassamh:oai:scholarworks.umass.edu:cee_faculty_pubs-1839 2023-05-15T13:58:10+02:00 Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification Halberstadt, Anna Ruth W. Gleason, Colin J. Moussavi, Mahsa S. Pope, Allen Trusel, Luke D. 2020-01-01T08:00:00Z application/pdf https://scholarworks.umass.edu/cee_faculty_pubs/840 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1839&context=cee_faculty_pubs unknown ScholarWorks@UMass Amherst https://scholarworks.umass.edu/cee_faculty_pubs/840 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1839&context=cee_faculty_pubs http://creativecommons.org/licenses/by/4.0/ CC-BY Civil and Environmental Engineering Faculty Publication Series supraglacial lakes surface meltwater supervised classification Landsat-8 Antarctic ice shelves ice shelf stability sea level rise text 2020 ftunivmassamh 2022-01-09T21:35:43Z Surface meltwater generated on ice shelves fringing the Antarctic Ice Sheet can drive ice-shelf collapse, leading to ice sheet mass loss and contributing to global sea level rise. A quantitative assessment of supraglacial lake evolution is required to understand the influence of Antarctic surface meltwater on ice-sheet and ice-shelf stability. Cloud computing platforms have made the required remote sensing analysis computationally trivial, yet a careful evaluation of image processing techniques for pan-Antarctic lake mapping has yet to be performed. This work paves the way for automating lake identification at a continental scale throughout the satellite observational record via a thorough methodological analysis. We deploy a suite of different trained supervised classifiers to map and quantify supraglacial lake areas from multispectral Landsat-8 scenes, using training data generated via manual interpretation of the results from k-means clustering. Best results are obtained using training datasets that comprise spectrally diverse unsupervised clusters from multiple regions and that include rock and cloud shadow classes. We successfully apply our trained supervised classifiers across two ice shelves with different supraglacial lake characteristics above a threshold sun elevation of 20°, achieving classification accuracies of over 90% when compared to manually generated validation datasets. The application of our trained classifiers produces a seasonal pattern of lake evolution. Cloud shadowed areas hinder large-scale application of our classifiers, as in previous work. Our results show that caution is required before deploying ‘off the shelf’ algorithms for lake mapping in Antarctica, and suggest that careful scrutiny of training data and desired output classes is essential for accurate results. Our supervised classification technique provides an alternative and independent method of lake identification to inform the development of a continent-wide supraglacial lake mapping product. Text Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves University of Massachusetts: ScholarWorks@UMass Amherst Antarctic The Antarctic |
institution |
Open Polar |
collection |
University of Massachusetts: ScholarWorks@UMass Amherst |
op_collection_id |
ftunivmassamh |
language |
unknown |
topic |
supraglacial lakes surface meltwater supervised classification Landsat-8 Antarctic ice shelves ice shelf stability sea level rise |
spellingShingle |
supraglacial lakes surface meltwater supervised classification Landsat-8 Antarctic ice shelves ice shelf stability sea level rise Halberstadt, Anna Ruth W. Gleason, Colin J. Moussavi, Mahsa S. Pope, Allen Trusel, Luke D. Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification |
topic_facet |
supraglacial lakes surface meltwater supervised classification Landsat-8 Antarctic ice shelves ice shelf stability sea level rise |
description |
Surface meltwater generated on ice shelves fringing the Antarctic Ice Sheet can drive ice-shelf collapse, leading to ice sheet mass loss and contributing to global sea level rise. A quantitative assessment of supraglacial lake evolution is required to understand the influence of Antarctic surface meltwater on ice-sheet and ice-shelf stability. Cloud computing platforms have made the required remote sensing analysis computationally trivial, yet a careful evaluation of image processing techniques for pan-Antarctic lake mapping has yet to be performed. This work paves the way for automating lake identification at a continental scale throughout the satellite observational record via a thorough methodological analysis. We deploy a suite of different trained supervised classifiers to map and quantify supraglacial lake areas from multispectral Landsat-8 scenes, using training data generated via manual interpretation of the results from k-means clustering. Best results are obtained using training datasets that comprise spectrally diverse unsupervised clusters from multiple regions and that include rock and cloud shadow classes. We successfully apply our trained supervised classifiers across two ice shelves with different supraglacial lake characteristics above a threshold sun elevation of 20°, achieving classification accuracies of over 90% when compared to manually generated validation datasets. The application of our trained classifiers produces a seasonal pattern of lake evolution. Cloud shadowed areas hinder large-scale application of our classifiers, as in previous work. Our results show that caution is required before deploying ‘off the shelf’ algorithms for lake mapping in Antarctica, and suggest that careful scrutiny of training data and desired output classes is essential for accurate results. Our supervised classification technique provides an alternative and independent method of lake identification to inform the development of a continent-wide supraglacial lake mapping product. |
format |
Text |
author |
Halberstadt, Anna Ruth W. Gleason, Colin J. Moussavi, Mahsa S. Pope, Allen Trusel, Luke D. |
author_facet |
Halberstadt, Anna Ruth W. Gleason, Colin J. Moussavi, Mahsa S. Pope, Allen Trusel, Luke D. |
author_sort |
Halberstadt, Anna Ruth W. |
title |
Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification |
title_short |
Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification |
title_full |
Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification |
title_fullStr |
Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification |
title_full_unstemmed |
Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification |
title_sort |
antarctic supraglacial lake identification using landsat-8 image classification |
publisher |
ScholarWorks@UMass Amherst |
publishDate |
2020 |
url |
https://scholarworks.umass.edu/cee_faculty_pubs/840 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1839&context=cee_faculty_pubs |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves |
op_source |
Civil and Environmental Engineering Faculty Publication Series |
op_relation |
https://scholarworks.umass.edu/cee_faculty_pubs/840 https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1839&context=cee_faculty_pubs |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766266264175509504 |