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Treatment of horizontal and vertical tidal signals in GPS data: A case study on a floating ice shelf
Citation
King, MA and Coleman, R and Morgan, PJ, Treatment of horizontal and vertical tidal signals in GPS data: A case study on a floating ice shelf, Earth Planets and Space, 52, (11) pp. 1043-1047. ISSN 1343-8832 (2000) [Refereed Article]
Abstract
Knowledge of the surface velocity and strain of ice shelves is important in determining their present kinematic state and detecting any change in that state. Data collected using the Global Positioning System (GPS) often plays an important role in determing these parameters, either directly, or as ground-truthing to other techniques such as InSAR. The processing of GPS data on floating ice shelves is complicated by the presence of a distinct vertical tidal signal and large horizontal motions in the data. Over a one hour period, vertical and horizontal movements can be as much as 0.3 metres and 0.1 metres respectively. For such GPS data to be processed using conventional static methods would require the observation period to be split into small (∼1 hour) segments, and the segments processed separately. Other processing options may include kinematic processing or sequential processing, although these techniques have their own drawbacks. Instead, we have developed software to remove signals based on a priori knowledge of the ice shelf motion. The tidal signal is removed using a local tide model and the horizontal velocity effect is corrected to a specific time epoch. This allows us to process our GPS data in a tide-free, velocity-free environment for a given day using conventional GPS processing software. The corrected GPS data, now largely free from the effects of ice shelf motion, may then be combined to produce high precision velocity and strain rate models of the ice shelf. Copy right© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences.
Item Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Geodesy |
Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
Objective Group: | Adaptation to climate change |
Objective Field: | Social impacts of climate change and variability |
UTAS Author: | King, MA (Professor Matt King) |
UTAS Author: | Coleman, R (Professor Richard Coleman) |
ID Code: | 19970 |
Year Published: | 2000 |
Web of Science® Times Cited: | 14 |
Deposited By: | Geography and Environmental Studies |
Deposited On: | 2000-08-01 |
Last Modified: | 2001-04-11 |
Downloads: | 0 |
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