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    New algorithms for the compilation of glacier inventories

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    Author
    Kienholz, Christian
    Chair
    Hock, Regine
    Arendt, Anthony
    Committee
    Meyer, Franz
    Metadata
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    URI
    http://hdl.handle.net/11122/4636
    Abstract
    Glacier inventories are used for many applications in glaciology, however, their manual compilation is time-consuming. Here, we present two new algorithms for the automatic compilation of glacier inventories. The first approach is based on hydrological modeling tools and separates glacier complexes into individual glaciers, requiring a digital elevation model (DEM) and glacier complex outlines as input. Its application to > 60,000 km² of ice in Alaska (~98% success rate) and southern Arctic Canada (~97% success rate) indicates the method is robust if DEMs and glacier complex outlines of good quality are available. The second algorithm relies on glacier outlines and a DEM and derives centerlines in a three-step 'cost grid -- least cost route' procedure. First, termini and heads are determined for every glacier. Second, centerlines are derived by determining the least cost route on a previously determined cost grid. Third, the centerlines are split into branches, followed by the attribution of a branch order. Application to > 21,000 Alaska glaciers shows that ~5.5% of the glacier heads and ~3.5% of the termini require manual correction. With corrected heads and termini, ~1.5% of the actual derived centerlines need edits. Comparison with alternative approaches reveals that the centerlines vary significantly depending on the algorithm used.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2013
    Table of Contents
    Chapter 1. General introduction -- Chapter 2. A new semi-automatic approach for dividing glacier complexes into individual glaciers -- Chapter 3. A new method for deriving glacier centerlines applied to glaciers in Alaska and northwest Canada -- Chapter 4. General conclusions.
    Date
    2013-12
    Type
    Thesis
    Collections
    Geosciences

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