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How to create arbitrary coordinate system in ArcGIS Pro?

Question asked by avpietraszek on Apr 25, 2020
Latest reply on Apr 27, 2020 by BSavric-esristaff

I need to georeference a jpeg map of an archaeological excavation with an arbitrary grid system where each square in the grid is 1 m x 1 m. The locations of artifacts within the grid are listed according to Northing and Easting decimal locations relative to a false origin 0,0 and the distance north and east from the origin point in meters. For example, an artifact located 1.5 m north and 2 m east of the origin point is at 1.5 N, 2 E. 


How can I create such an arbitrary coordinate system in ArcGIS Pro in order to produce a map of the artifact locations across the excavation grid?


I have never really used ArcGIS before so I'm not sure where to start.


Thank you!