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Projection and Coordinate System Basics
One of the things that makes GIS such a powerful visualization and analytical tool is its ability to overlay multiple layers of information on a map. Putting our GIS data into real-world coordinate systems and projections is how we do this. By placing our data in a real-world system, we tie it to the Earth. This allows us to locate features anywhere on the Earth’s surface and then bring them onto a map so that we can see how those features are related spatially.
There are two basic types of coordinate systems we can use in ArcGIS Pro: geographic and projected. A geographic coordinate system is based on a 3D model of the Earth, called the ellipsoid or spheroid. The ellipsoid is then tied back to the physical ...
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