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I have a polygon layer that is not matching the World Street map by a few hundred meters in ArcMap. How can I correct this? I have tried projecting the polygon shapefile to WGS 1984 and WGS_1984_Web_Mercator Auxiliary Sphere but with both, I get: ERROR 000151: The geotransformation is not valid. enter image description here

  • List of transformations you can find saved in your disc in path: >...\ArcGIS\Desktop10.5\Documentation\geographic_transformations.pdf – JuniorPythonNewbie Nov 19 '18 at 13:16
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You should not need to re-project your shapefile. You can apply a geographic transformation to the Data Frame and the data will 'project-on-the-fly'. If it is still not aligning, the shapefile may have it's coordinate system defined incorrectly. You may then want to clear the coordinate system (delete the .prj file if it's a shapefile) and then try determining what the correct coordinate sytem is.

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