uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
A new method for deriving glacier centerlines applied to glaciers in Alaska and northwest Canada
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2014 (English)In: The Cryosphere, ISSN 1994-0416, E-ISSN 1994-0424, Vol. 8, no 2, 503-519 p.Article in journal (Refereed) Published
Abstract [en]

This study presents a new method to derive centerlines for the main branches and major tributaries of a set of glaciers, requiring glacier outlines and a digital elevation model (DEM) as input. The method relies on a "cost grid-least-cost route approach" that comprises three main steps. First, termini and heads are identified for every glacier. Second, centerlines are derived by calculating the least-cost route on a previously established cost grid. Third, the centerlines are split into branches and a branch order is allocated. Application to 21 720 glaciers in Alaska and northwest Canada (Yukon, British Columbia) yields 41 860 centerlines. The algorithm performs robustly, requiring no manual adjustments for 87.8% of the glaciers. Manual adjustments are required primarily to correct the locations of glacier heads (7.0% corrected) and termini (3.5% corrected). With corrected heads and termini, only 1.4% of the derived centerlines need edits. A comparison of the lengths from a hydrological approach to the lengths from our longest centerlines reveals considerable variation. Although the average length ratio is close to unity, only similar to 50% of the 21 720 glaciers have the two lengths within 10% of each other. A second comparison shows that our centerline lengths between lowest and highest glacier elevations compare well to our longest centerline lengths. For > 70% of the 4350 glaciers with two or more branches, the two lengths are within 5% of each other. Our final product can be used for calculating glacier length, conducting length change analyses, topological analyses, or flowline modeling.

Place, publisher, year, edition, pages
2014. Vol. 8, no 2, 503-519 p.
National Category
Physical Geography
URN: urn:nbn:se:uu:diva-227142DOI: 10.5194/tc-8-503-2014ISI: 000335377200012OAI: oai:DiVA.org:uu-227142DiVA: diva2:728702
Available from: 2014-06-24 Created: 2014-06-24 Last updated: 2014-06-24Bibliographically approved

Open Access in DiVA

fulltext(4724 kB)210 downloads
File information
File name FULLTEXT01.pdfFile size 4724 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Hock, Regine
By organisation
In the same journal
The Cryosphere
Physical Geography

Search outside of DiVA

GoogleGoogle Scholar
Total: 210 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 456 hits
ReferencesLink to record
Permanent link

Direct link