I am very new to ArcGIS and I hope I have over-looked something obvious with this!

I have a set of polygons that have been loaded into ArcGIS Pro 10.3 without coordinate information. Unfortunately, it is not possible for me to get the co-ordinate information however I have been able to move the polygons to the correct position on a world map (it was quite easy because they line up with roads). However, I am unable now to 'share' this data online because I get the error: '20028 Data source has no spatial reference'.

Please does anybody know a way around this? Is there another way of sharing it or, ideally, can I get ArcGIS to work out the spatial references given the positions of the polygons on the map?


The spatial reference that your error message is referring to is the missing coordinate system that we worked on on your other question (Moving set of polygons in ArcGIS Pro?).

I would recommend trying to figure out the coordinate system first instead of moving the data manually and then trying to apply a coordinate system (spatial reference). (My reasoning being that the more manipulation you do the data first before trying to assign a correct spatial reference, the more difficult it will be.)

Identifying Coordinate System of Shapefile when Unknown? addresses how to figure out an unknown coordinate system. I particularly like mkennedy's answer since it has more detail. It is for working in ArcMap but I imagine ArcGIS Pro works similarly.

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  • That's brilliant, thanks for the link Sara! I can't check it out until after the weekend now but my fingers are crossed! – Jamie Edgecombe Aug 22 '15 at 9:39
  • Apologies for the slow reply on this. I tried the suggestions on the link but couldn't get it to work on ArcGIS (probably a reflection of my GIS ineptitude rather than the software). I found out, more by accident than anything, that I was able to share the file as a webmap despite having the error and it is appearing correctly online. I did this by not clicking 'analyze' and going straight to 'share' instead. Probably not ideal but a sufficient fix for now! – Jamie Edgecombe Aug 27 '15 at 10:15
  • @JamieEdgecombe Glad you got it working! – Sara Barnes Aug 27 '15 at 12:04

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