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1. ### en.wikipedia.org › wiki › Geographic_coordinate_systemGeographic coordinate system - Wikipedia

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. 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.

• Decimal Degrees

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

2. ### simple.wikipedia.org › wiki › Geographic_coordinateGeographic coordinate system - Simple English Wikipedia, the ...

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. ### en.wikipedia.org › wiki › Coordinate_systemCoordinate system - Wikipedia

Geographic coordinate system, the spherical coordinates of latitude and longitude Projected coordinate systems, including thousands of cartesian coordinate systems, each based on a map projection to create a planar surface of the world or a region.

4. ### 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 ).

5. ### tum.wikipedia.org › wiki › Geographic_coordinate_systemGeographic coordinate system - Wikipedia

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. 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.

6. ### pro.arcgis.com › en › pro-appCoordinate systems, map projections, and transformations - Esri

Geographic coordinate systems (GCS) are based on a three-dimensional ellipsoidal or spherical surface, and locations are defined using angular measurements, usually in decimal degrees, measuring degrees of longitude (x-coordinates) and degrees of latitude (y-coordinates).

7. ### www.esri.com › coordinate-systems-differenceCoordinate Systems: What's the Difference? - ArcGIS Blog

A geographic coordinate system (GCS) is a reference framework that defines the locations of features on a model of the earth. It’s shaped like a globe—spherical. Its units are angular, usually degrees. A projected coordinate system (PCS) is flat. It contains a GCS, but it converts that GCS into a flat surface, using math (the projection ...

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