Geomatic methods applied to the study of the front position changes of Johnsons and Hurd Glaciers, Livingston Island, Antarctica, between 1957 and 2013
Various geomatic measurement techniques can be efficiently combined for surveying glacier fronts. Aerial photographs and satellite images can be used to determine the position of the glacier terminus. If the glacier front is easily accessible, the classic surveys using theodolite or total station, G...
Main Authors: | , , , , , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2016-08-01
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Series: | Earth System Science Data |
Online Access: | http://www.earth-syst-sci-data.net/8/341/2016/essd-8-341-2016.pdf |
Summary: | Various geomatic measurement techniques can be efficiently combined for
surveying glacier fronts. Aerial photographs and satellite images can be
used to determine the position of the glacier terminus. If the glacier front
is easily accessible, the classic surveys using theodolite or total station,
GNSS (Global Navigation Satellite System) techniques, laser-scanner or
close-range photogrammetry are possible. When the accessibility to the
glacier front is difficult or impossible, close-range photogrammetry proves
to be useful, inexpensive and fast. In this paper, a methodology combining
photogrammetric methods and other techniques is applied to determine the
calving front position of Johnsons Glacier. Images taken in 2013 with an
inexpensive nonmetric digital camera are georeferenced to a global
coordinate system by measuring, using GNSS techniques, support points in
accessible areas close to the glacier front, from which control points in
inaccessible points on the glacier surface near its calving front are
determined with theodolite using the direct intersection method. The front
position changes of Johnsons Glacier during the period 1957–2013, as well as
those of the land-terminating fronts of Argentina, Las Palmas and Sally
Rocks lobes of Hurd glacier, are determined from different geomatic
techniques such as surface-based GNSS measurements, aerial photogrammetry
and satellite optical imagery. This provides a set of frontal positions
useful, e.g., for glacier dynamics modeling and mass balance studies.<br><br>Link to the data repository: <a href="https://doi.pangaea.de/10.1594/PANGAEA.845379" target="_blank">https://doi.pangaea.de/10.1594/PANGAEA.845379</a>. |
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ISSN: | 1866-3508 1866-3516 |