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  1. The geographic coordinate system ( GCS) is a spherical or ellipsoidal coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. [1] It is the simplest, oldest and most widely used of the various of spatial reference systems that are in use, and forms the basis for most others.

  2. A geographical coordinate system is a coordinate system. This means that every place can be specified by a set of three numbers, called coordinates. A full circle can be divided into 360 degrees (or 360°); this was first done by the Babylonians; Ancient Greeks, like Ptolemy later extended the theory. Today, degrees are divided further.

  3. In geometry, a coordinate system is a system that uses one or more numbers, or coordinates, to uniquely determine the position of the points or other geometric elements on a manifold such as Euclidean space. The order of the coordinates is significant, and they are sometimes identified by their position in an ordered tuple and sometimes by a letter, as in "the x-coordinate". The coordinates are taken to be real numbers in elementary mathematics, but may be complex numbers or elements of a more a

  4. Gaussian grid. Geography (Ptolemy) Geohash. Geomagnetic latitude. German Naval Grid System. Global Area Reference System. Global Navigation Grid Code. Grid (spatial index) Projected coordinate system.

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    For the US

    1. The United States Geological Survey's public domain Geographical Names Information Service database serviceis extremely extensive, although riddled with errors. It also provides linkouts to topozone and terraserver so that you can tweak the results to your liking. Most of these coordinates use 2. US Census TIGER 3. US Census Boundary and Annexation Survey 4. Find Longitude and Latitude coordinates by US Zip Code 5. Search engine for GPS coordinates of latitude and longitude of the United S...

    For other regions

    1. For placenames in Antarctica, try Geographic Names Information System, Antarctica 2. For placenames in Australia, try Geoscience Australia Place Name Search 3. For placenames in Canada, try the Canadian Geographical Names Data Base (CGNDB) Querying Canadian Geographical Names 4. For placenames in the UK, Streetmap.co.uk is very useful for clicking on a precise point to show the coordinates. Near the foot of a page displaying a map is a link "Click here to convert/measure coordinates" which...

    Using a GPS receiverwith a clear view of the sky.
    Looking for "Waypoint" files on sites for GPS users, e.g.
    Googling for a city name together with "latitude", "longitude" will usually yield a plethora of useful results (example)
  5. A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols.

  6. Geographic coordinate conversion has applications in cartography, surveying, navigation and geographic information systems . 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 ...

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