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A new semi-automatic approach for dividing glacier complexes into individual glaciers
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2013 (English)In: Journal of Glaciology, ISSN 0022-1430, E-ISSN 1727-5652, Vol. 59, no 217, 925-937 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2013. Vol. 59, no 217, 925-937 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-210758DOI: 10.3189/2013JoG12J138ISI: 000325385200011OAI: oai:DiVA.org:uu-210758DiVA: diva2:664187
Available from: 2013-11-14 Created: 2013-11-14 Last updated: 2017-12-06Bibliographically approved

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Hock, Regine

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