Define Coordinate system without a spatial reference

Defining a Coordinate System of data without a spatial reference

Once you have identified the coordinate system of the data, you can define the coordinate system using the “define projection” tool.

i. ArcToolbox > Data Management Tools > Projections and Transormations > Define Projection
II. NOTE: This tool DOES NOT createa  new data layer as an output.  It modifies the existing data layer so you must make a copy before using this tool.

 

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