Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery
The formation and development of crevasses provides great insight into the overall dynamics of a calving glacier, in particular because the formation of crevasses reflects glacier stretching, the same process that leads to calving. If a crevasse opens to the water-line then a calving event normally...
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The University of Edinburgh
2015
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ftunivedinburgh:oai:era.ed.ac.uk:1842/11806 2023-07-30T04:03:39+02:00 Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery Kinnear, Duncan A. Hulton, Nicholas R. J. 01/10/2015 application/pdf http://hdl.handle.net/1842/11806 en eng The University of Edinburgh http://hdl.handle.net/1842/11806 Automated Crevasse Detection Feature Tracking Calving Glacier Tunabreen Svalbard TerraSAR-X MSc Geographical Information Science GIS Thesis or Dissertation Masters MSc Master of Science 2015 ftunivedinburgh 2023-07-09T20:31:59Z The formation and development of crevasses provides great insight into the overall dynamics of a calving glacier, in particular because the formation of crevasses reflects glacier stretching, the same process that leads to calving. If a crevasse opens to the water-line then a calving event normally occurs. Thus outlining where and when crevasses form and how fast they open up, can be very important in detecting pre-conditions for calving events. Detecting crevasses from satellite imagery is an efficient way of tracking their movement, but manual techniques for identifying individual features and monitoring their evolution are time-consuming. In addition, most optical data is subject to inconsistent illumination due to time of day or season, long periods of darkness during winter, and cloud cover. High-resolution radar imagery provides an alternative that does not rely on illumination by the sun and is independent of weather constraints. This study uses a series of TerraSAR-X images of Tunabreen, a grounded calving glacier in Svalbard, taken between February 2013 and July 2014, to automatically detect and delineate crevasses close to the calving front. Feature tracking techniques are used to measure the relative strain taken up by these crevasses in relation to the ‘inter-crevasse’ ice between them, as the glacier approaches the calving margin. Strain rates follow a surface velocity gradient that increases as the glacier approaches the calving margin, but both velocity and strain rates level off and, in some cases, decrease in the final ~300m before the terminus. Seasonal fluctuations are also observed. Master Thesis glacier Svalbard Edinburgh Research Archive (ERA - University of Edinburgh) Svalbard Tunabreen ENVELOPE(17.387,17.387,78.461,78.461) |
institution |
Open Polar |
collection |
Edinburgh Research Archive (ERA - University of Edinburgh) |
op_collection_id |
ftunivedinburgh |
language |
English |
topic |
Automated Crevasse Detection Feature Tracking Calving Glacier Tunabreen Svalbard TerraSAR-X MSc Geographical Information Science GIS |
spellingShingle |
Automated Crevasse Detection Feature Tracking Calving Glacier Tunabreen Svalbard TerraSAR-X MSc Geographical Information Science GIS Kinnear, Duncan A. Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery |
topic_facet |
Automated Crevasse Detection Feature Tracking Calving Glacier Tunabreen Svalbard TerraSAR-X MSc Geographical Information Science GIS |
description |
The formation and development of crevasses provides great insight into the overall dynamics of a calving glacier, in particular because the formation of crevasses reflects glacier stretching, the same process that leads to calving. If a crevasse opens to the water-line then a calving event normally occurs. Thus outlining where and when crevasses form and how fast they open up, can be very important in detecting pre-conditions for calving events. Detecting crevasses from satellite imagery is an efficient way of tracking their movement, but manual techniques for identifying individual features and monitoring their evolution are time-consuming. In addition, most optical data is subject to inconsistent illumination due to time of day or season, long periods of darkness during winter, and cloud cover. High-resolution radar imagery provides an alternative that does not rely on illumination by the sun and is independent of weather constraints. This study uses a series of TerraSAR-X images of Tunabreen, a grounded calving glacier in Svalbard, taken between February 2013 and July 2014, to automatically detect and delineate crevasses close to the calving front. Feature tracking techniques are used to measure the relative strain taken up by these crevasses in relation to the ‘inter-crevasse’ ice between them, as the glacier approaches the calving margin. Strain rates follow a surface velocity gradient that increases as the glacier approaches the calving margin, but both velocity and strain rates level off and, in some cases, decrease in the final ~300m before the terminus. Seasonal fluctuations are also observed. |
author2 |
Hulton, Nicholas R. J. |
format |
Master Thesis |
author |
Kinnear, Duncan A. |
author_facet |
Kinnear, Duncan A. |
author_sort |
Kinnear, Duncan A. |
title |
Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery |
title_short |
Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery |
title_full |
Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery |
title_fullStr |
Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery |
title_full_unstemmed |
Automated detection and tracking of crevasses on a calving glacier from TerraSAR-X imagery |
title_sort |
automated detection and tracking of crevasses on a calving glacier from terrasar-x imagery |
publisher |
The University of Edinburgh |
publishDate |
2015 |
url |
http://hdl.handle.net/1842/11806 |
long_lat |
ENVELOPE(17.387,17.387,78.461,78.461) |
geographic |
Svalbard Tunabreen |
geographic_facet |
Svalbard Tunabreen |
genre |
glacier Svalbard |
genre_facet |
glacier Svalbard |
op_relation |
http://hdl.handle.net/1842/11806 |
_version_ |
1772814695959363584 |