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1. ### desktop.arcgis.com › en › arcmapWhat are geographic coordinate systems? - Esri

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 ).

2. ### old-www.cs.dartmouth.edu › ~cs50 › dataGeographic coordinate system - Wikipedia, the free encyclopedia

A geographic coordinate systemis a coordinate systemthat enables every location on the Earth to be specified by a set of numbers or letters. The coordinates are often chosen such that one of the numbers represents vertical position, and two or threeof the numbers represent horizontal position.

3. ### en.wikipedia.org › wiki › State_Plane_Coordinate_SystemState Plane Coordinate System - Wikipedia

The State Plane Coordinate System ( SPCS) is a set of 125 geographic zones or coordinate systems designed for specific regions of the United States. Each state contains one or more state plane zones, the boundaries of which usually follow county lines. There are 108 zones in the contiguous US, with 10 more in Alaska, 5 in Hawaii, one for Puerto ...

4. ### en.wikiversity.org › wiki › Geographic_coordinateGeographic coordinate conversion - Wikiversity

Oct 3, 2022 · There are three basic forms of a coordinate. Coordinate containing degrees (integer), minutes (integer), and seconds (integer, or real number) (DMS). Coordinate containing degrees (integer) and minutes (real number) (MinDec). Coordinate containing only degrees (real number) (DegDec).

5. ### support.esri.com › en › technical-articleHow To: Identify the spatial reference, projection, or ...

Jun 27, 2022 · Local Coordinate Systems. CAD data is frequently created in a local coordinate system. Unlike data in a geographic coordinate system that has its origin (0,0 coordinates), where the Prime Meridian crosses the Equator off the west coast of Africa, a local coordinate system can have its origin (0,0) anywhere on the surface of the earth.

6. ### gis.stackexchange.com › questions › 149749Is WGS84 a Coordinate system or projection system?

Jun 4, 2015 · Examples of this include WGS84 (World Geodetic Survey 1984), NAD83 (North American Datum 1983), or NAD27 (used before NAD83. North American Datum 1927) The other is a Projected Coordinate System or PCS. A PCS is used to take those points that you defined with your GCS and translate them to a 2-dimensional surface.

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

May 30, 2022 · A geographic coordinate system defines two-dimensional coordinates based on the Earth’s 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. Longitude Coordinates

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