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v. t. e. A geographic coordinate system ( GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on Earth as latitude and longitude. [ 1] It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others.
Absolute location, a location as described by its latitude and longitude on the Earth. For example, the coordinates of Albany, New York are 42.6525° N, 73.7572° W. Relative location, a location as described by where it is compared to something else. For example, Albany, New York is roughly 140 miles north of New York City.
Longitude at right edge of map, in decimal degrees; Precision. Longitude: from West to East this map definition covers 0.135 degrees. At an image width of 200 pixels, that is 0.0007 degrees per pixel. At an image width of 1000 pixels, that is 0.0001 degrees per pixel. Latitude: from North to South this map definition covers 0.1395 degrees.
Geodetic coordinates. Geodetic coordinates are a type of curvilinear orthogonal coordinate system used in geodesy based on a reference ellipsoid . They include geodetic latitude (north/south) ϕ, longitude (east/west) λ, and ellipsoidal height h (also known as geodetic height [1] ). The triad is also known as Earth ellipsoidal coordinates [2 ...
Longitude: from West to East this map definition covers 8.05 degrees. At an image width of 200 pixels, that is 0.0403 degrees per pixel. At an image width of 1000 pixels, that is 0.0081 degrees per pixel. Latitude: from North to South this map definition covers 6.9 degrees. At an image height of 200 pixels, that is 0.0345 degrees per pixel.
The coast of Turkey, original Asian shore seen from a beach on Rhodes. The three-continent system was an idea devised in Archaic Greece, a time of Greek colonial expansion and trade throughout the Mediterranean and the spread of writing again. Writing is a prerequisite of written geography.
The history of longitude describes the centuries-long effort by astronomers, cartographers and navigators to discover a means of determining the longitude of any given place on Earth. The measurement of longitude is important to both cartography and navigation. In particular, for safe ocean navigation, knowledge of both latitude and longitude ...
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