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1. ### gisgeography.com › latitude-longitude-coordinatesLatitude, Longitude and Coordinate System Grids - GIS Geography

Mar 10, 2024 · A geographic coordinate system defines two-dimensional coordinates based on the Earths surface. It has an angular unit of measure, prime meridian , and datum (which contains the spheroid). As shown in the image below, lines of longitude have X-coordinates between -180 and +180 degrees.

2. ### www.britannica.com › science › latitudeLatitude and longitude | Definition, Examples, Diagrams, & Facts

Mar 25, 2024 · Latitude and longitude, coordinate system by means of which the position or location of any place on Earth’s surface can be determined and described. Latitude is a measurement of location north or south of the Equator. Longitude is a similar measurement east or west of the Greenwich meridian.

3. ### geo.libretexts.org › Bookshelves › Geography_(Physical)2.3: Datums, Coordinate Systems, and Map Projections

May 21, 2023 · The coordinate system used to define locations on the three-dimensional earth is the geographic coordinate system (GCS), based on a sphere or spheroid. A spheroid (a.k.a. ellipsoid) is simply a slightly wider sphere than it is tall and approximates the actual shape of the earth more closely.

4. ### www.usu.edu › geospatial › tutorialsGeographic Coordinate Systems | Geospatial | USU

Geographic coordinate systems form the first level of defining where we are on the earth. All spatial data must first address the curved surface of the earth, thus all coordinate systems will have a geographic coordinate system “core” that defines the spheroid, geoid, units of measure, and prime meridian on which all further measurements ...

5. ### wiki.gis.com › wiki › indexGeographic coordinate system - GIS Wiki | The GIS Encyclopedia

Oct 5, 2018 · A geographic coordinate system (GCS) defines locations on the earth using a three-dimensional spherical surface [1], it is a reference system that uses latitude and longitude to identify locations on a spheroid or sphere. A datum, prime meridian, and angular unit are parts of a GCS [2] .

6. ### www.e-education.psu.edu › natureofgeoinfo › c2_p1110. Geographic Coordinate System | The Nature of Geographic...

Figure 2.11.1 The geographic coordinate system. Longitude specifies positions east and west as the angle between the prime meridian and a second meridian that intersects the point of interest. Longitude ranges from +180 (or 180° E) to -180° (or 180° W). 180° East and West longitude together form the International Date Line.

7. ### www.e-education.psu.edu › natureofgeoinfo › c2_p109. Coordinate Systems | The Nature of Geographic Information

The geographic coordinate system is designed specifically to define positions on the Earth's roughly-spherical surface. Instead of the two linear measurement scales, x and y, the geographic coordinate systems juxtaposes two curved measurement scales.

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