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geodetic survey |
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geodetic survey [¦jē·ə¦ded·ik ′sər‚vā] (engineering) A survey in which the figure and size of the earth are considered; it is applicable for large areas and long lines and is used for the precise location of basic points suitable for controlling other surveys. 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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Geodetic Survey manages a network of beacons that transmit differential GPS corrections from beacons across the country. Their assignment became a 5-year-long quest to establish "the eighteenth century's most ambitious geodetic survey, and a project without precedent," according to Danson. The researchers used three different methods to arrive at their estimate--(1) a 1998 global gravitational model produced by NASA and the National Imagery and Mapping Agency, (2) a 1999 regional, high-resolution geoid model, and (3) recent measurements made by the National Geodetic Survey of a reference marker on the NIST site. |
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