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geodesy |
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geodesyScience of measuring and mapping Earth's surface for making maps and correlating geological, gravitational, and magnetic measurements. Geodetic surveys, formerly carried out by means of various measuring techniques on the surface, are now commonly made by using radio signals and laser beams from orbiting satellites (see global positioning system). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Many geodesists get around that problem by putting antennas on top of buried concrete pillars, but Blewitt rejected this approach because concrete can deform and shrink over the years. The Polish CORS network will provide critical GPS data for geodetic applications to regional users such as geodesists and civil engineers. In the last few years, geodesists, using a technique called Very Long Baseline Interferometry (VLBI), have been able to detect these motions directly by comparing the arrival times of quasar radio signals on opposite sides of plate boundaries (SN: 12/21 & 29/85, p. |
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