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Do I need to repoject a shapefile before importing into ArcGIS Online?

Question asked by vanillaforever12 on Oct 26, 2017
Latest reply on Nov 1, 2017 by xander_bakker


I know ArcGIS Online uses the WGS 1984 Web Mercator coordinate system as the default projected coordinate system, and it will re-project layers in different projections on the fly to its default projected coordinate system.

I'd like to import a shapefile which is in a different coordinate system (e.g., NAD 1983 17N), I was wondering whether I need to convert this to Web Mercator before uploading it to ArcGIS Online? So my question is, in general, does the coordinate system of data layer (shapefile, CSV.) has an effect on the accuracy of displaying layers in ArcGIS Online?