DAVID HAY JONES / SCIENCE PHOTO LIBRARY DAVID HAY JONES / SCIENCE PHOTO LIBRARY
GPS topographical glacier mapping. Glaciologist using a snowmobile-mounted Global Positioning System (GPS) unit to map 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. This glaciologist drove for eight hours over the entire glacier, mapping its extent and topography. Photographed on the Marmaglaciaren glacier in Swedish Lapland, in spring 2006.
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