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Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...
Blue Marble's first software product, the Geographic Calculator, [2] was developed in 1992 and released in 1993. The Geographic Calculator is a coordinate conversion library with a database of coordinate mathematical objects including projections, coordinate systems, datums, ellipsoids, linear and angular units. The tool is primarily used to ...
In geodesy, geographic coordinate conversion is defined as translation among different coordinate formats or map projections all referenced to the same geodetic datum. [1] A geographic coordinate transformation is a translation among different geodetic datums. Both geographic coordinate conversion and transformation will be considered in this ...
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Simpler distance calculation (by Pythagorean Theorem, rather than spherical trigonometry) A single unambiguous representation instead of the three (3) formats of latitude and longitude, each in widespread use, and each having punctuation sub-variants: degrees-minutes-seconds (DMS): N 38°53'23.3", W 077°02'11.6"
The length of a degree of longitude (east–west distance) depends only on the radius of a circle of latitude. For a sphere of radius a that radius at latitude φ is a cos φ , and the length of a one-degree (or π / 180 radian ) arc along a circle of latitude is
The coordinate origin of WGS 84 is meant to be located at the Earth's center of mass; the uncertainty is believed to be less than 2 cm. [ 7 ] Handheld GPS receiver at the Royal Observatory, Greenwich , indicating that the Greenwich meridian is 0.089 arcminutes (or 5.34 arcseconds ) west of the WGS 84 datum (the IERS Reference Meridian )
The X column is the ratio of the length of the parallel to the length of the equator; the Y column can be multiplied by 0.2536 [11] to obtain the ratio of the distance of that parallel from the equator to the length of the equator. [7] [9] Coordinates of points on a map are computed as follows: [7] [9]
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