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  1. Download as PDF Printable version In other projects Wikimedia Commons Languages On this Wikipedia the language links are at the top of the page across from the article title. Go to top. Contents move to sidebar (Top) 1 History 2 Latitude and longitude 3 Geodetic datum 4 Length of a degree 5 Alternate encodings 6 See also 7 Notes 8 References

    • Decimal Degrees

      Decimal degrees (DD) is a notation for expressing latitude...

    • from Maps
    • from Directories/Databases
    • from Other Sources

    From printed maps

    Looking at a printed map or atlas, either those you own or at a library.

    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, 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)
  2. People also ask

    What is a geographic coordinate system?

    What is a GCS in geography?

    What are the different versions of latitude and longitude?

    How do I enter degrees only coordinates in Wikipedia?

  3. Download as PDF Page for printing In other projects Wikimedia Commons Languages On this Wikipedia the language links are at the top of the page across from the article title. Go to top. Toggle the table of contents Geographic coordinate system 167 languages Acèh Адыгэбзэ Afrikaans Alemannisch አማርኛ Аԥсшәа العربية Aragonés Arpetan অসমীয়া Asturianu

  4. A geographic coordinate system (GCS) uses a three-dimensional spherical surface to define locations on the earth. A GCS is often incorrectly called a datum, but a datum is only one part of a GCS. A GCS includes an angular unit of measure, a prime meridian, and a datum (based on a spheroid ).

    • History
    • geodetic Datum
    • Horizontal Coordinates
    • 3D Cartesian Coordinates
    • on Other Celestial Bodies
    • See Also

    The invention of a geographic coordinate system is generally credited to Eratosthenes of Cyrene, who composed his now-lost Geography at the Library of Alexandria in the 3rd century BC. A century later, Hipparchus of Nicaea improved on this system by determining latitude from stellar measurements rather than solar altitude and determining longitude ...

    In order to be unambiguous about the direction of "vertical" and the "horizontal" surface above which they are measuring, map-makers choose a reference ellipsoid with a given origin and orientation that best fits their need for the area to be mapped. They then choose the most appropriate mapping of the spherical coordinate system onto that ellipsoi...

    Latitude and longitude

    The "latitude" (abbreviation: Lat., φ, or phi) of a point on Earth's surface is the angle between the equatorial plane and the straight line that passes through that point and through (or close to) the center of the Earth.[note 4] Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the Equator and to each other. The North Pole is 90° N; the South Pole is 90° S. The 0° parallel of latitude is designated the Equator, the fund...

    Map projection

    To establish the position of a geographic location on a map, a map projection is used to convert geodetic coordinates to plane coordinates on a map; it projects the datum ellipsoidal coordinates and height onto a flat surface of a map. The datum, along with a map projection applied to a grid of reference locations, establishes a grid system for plotting locations. Common map projections in current use include the Universal Transverse Mercator (UTM), the Military Grid Reference System (MGRS),...

    Every point that is expressed in ellipsoidal coordinates can be expressed as an rectilinear x y z (Cartesian) coordinate. Cartesian coordinates simplify many mathematical calculations. The Cartesian systems of different datums are not equivalent.

    Similar coordinate systems are defined for other celestial bodies such as: 1. The cartographic coordinate systems for almost all of the solid bodies in the Solar System were established by Merton E. Davies of the Rand Corporation, including Mercury, Venus, Mars, the four Galilean moons of Jupiter, and Triton, the largest moon of Saturn. 2. Selenogr...

  5. Where is this information found in the Wikipedia dump files? The Wiki database may be downloaded from but I can't see which file (s) I need to search for the coordinates. For example, the entry for Sydney includes: Coordinates: 33°51′35.9″S 151°12′40″E Where is this found in the dump files?