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I have both ArcMap and ArcGIS Pro. In both, I'd like to use a local coordinate system (US NAD 83 2011 StatePlane FIPS) to adjust a line layer to features I see on a basemap.

In ArcMap, I've set the line layer I'm using and the data frame properties to be that projected coordinate system. Therefore, the basemap should also have been reprojected.

In ArcGIS Pro, I've done the same thing, but instead of the data frame properties (not available), I've adjusted the map properties.

The original line layer is part of a feature dataset that is under the projected local coordinate system I chose.

However, when I open the line with a basemap in both programs, the location of the line on the basemap is slightly different between the two. Why? Which one is more accurate? Is it even possible to have an Esri basemap be reprojected from their default (WGS84 Web Mercator Auxiliary Sphere)?

  • I realized the answer. There were different transformations, even though they had the same projected coordinate system of US NAD 1983 2011 State Plane <State> <Zone> FIPS. In ArcMap, I'd applied a generic (maybe even custom) 'WGS 84 to NAD 83' transformation for the basemap, which is in WGS 84 by default; in ArcGIS Pro, I was using 'WGS_1984_(ITRF00)_To_NAD_1983_2011,' which was the correct one. – JMNC Jan 30 at 17:50

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