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A new semi-automati...
A new semi-automatic approach for dividing glacier complexes into individual glaciers
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Kienholz, Christian (author)
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- Hock, Regine (author)
- Uppsala universitet,Luft-, vatten- och landskapslära
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Arendt, Anthony A. (author)
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(creator_code:org_t)
- 2013
- 2013
- English.
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In: Journal of Glaciology. - 0022-1430 .- 1727-5652. ; 59:217, s. 925-937
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
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- Many glaciological and hydrological studies require outlines of individual glaciers rather than total ice cover. Here we develop a new semi-automatic algorithm that uses a digital elevation model (DEM) and outlines of glacier complexes to calculate the extents of individual glaciers. The algorithm first applies hydrological modeling tools to a modified DEM to calculate flowsheds. It then merges flowsheds that belong to individual glaciers using a distance-based approach, whose required empirical parameters are derived from the Juneau Icefield area in Alaska. In this region, 2% of similar to 1300 glaciers were misclassified. The algorithm was validated on >25 000 km(2) of ice in other regions in Alaska and on >40 000 km(2) of ice in Arctic Canada, resulting in similar to 2% and similar to 3% misclassified glaciers, respectively. Results indicate that the algorithm is robust provided the DEM and the outlines are of good quality.
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- ref (subject category)
- art (subject category)
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