Definitions[]
Geodetic data
| “ | is data used in geodesy, navigation, surveying by cartographers and satellite navigation systems to translate positions indicated on their products to their real position on earth. | ” |
| “ | describe[s] the size and shape of the earth and the position and elevation of points on the earth's surface.[1] | ” |
| “ | is a reference surface, a coordinate system and a set of defined reference points from which coordinates may be calculated to define a specific location on the Earth's surface, at a national or global scale. Geodetic datums are the fundamental positioning system for any country.[2] | ” |
Overview[]
Geodetic data is
| “ | 1. A reference surface consisting of five quantities: the latitude and longitude of an initial point, the azimuth of a line from that point, and the parameters of the reference ellipsoid. 2. The mathematical model of the earth used to calculate the coordinates on any map. Different nations use different datum for printing coordinates on their maps. The datum is usually referenced in the marginal information of each map.[3] | ” |
References[]
- ↑ Geographic Information Systems: Information on Federal Use and Coordination, at 17 n.b.
- ↑ GDA Frequently Asked Questions (full-text).
- ↑ U.S. Joint Chiefs of Staff, Joint Pub. 2-03: Geospatial Intelligence Support to Joint Operations, Glossary, at GL-5 (Mar. 22, 2007) (full-text).
See also[]
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