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Preparing for GPS mapping of a glacier

Preparing for GPS mapping of a glacier

E220/0071

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Credit

DAVID HAY JONES / SCIENCE PHOTO LIBRARY DAVID HAY JONES / SCIENCE PHOTO LIBRARY

Caption

GPS topographical glacier mapping. Glaciologist setting up a Global Positioning System (GPS) unit on a snowmobile, prior to mapping a glacier. This technique is called differential GPS (DGPS). DGPS is a way of improving the accuracy of GPS by using a signal from a fixed base station as well as the usual signals from orbiting satellites. It allows measurement of positional accuracy within a metre. Once set up, the glaciologist will drive the snowmobile over the entire glacier, mapping its extent and topography. Photographed on the Marmaglaciaren glacier in Swedish Lapland, in spring 2006.

Release details

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