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A to Z GIS | Explore this related guide, featuring updated terms and graphics and developed in coordination with Esri’s GIS Dictionary team.

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  1. [coordinate systems, measurement] A fixed reference point in a coordinate system from which all other points are calculated, usually represented by the coordinates (0,0) in a planar coordinate system and (0,0,0) in a three-dimensional system. The center of a projection is not always its origin.

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  2. [data architecture] The primary object in a relationship, such as a feature class containing measurement points.

  3. [network analysis, routing] A network location used in origin-destination cost matrix analysis that specifies a starting location.

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