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GRS 80 to WGS84

Question asked by fallingdog Champion on Apr 14, 2017
Latest reply on May 8, 2017 by MKennedy-esristaff

I have few thousand rasters in AK zone 4 state plane on NAD83 and in UTM5/6  on GRS 80 that I am trying to mosaic into Web Mercator. Arc is reporting that I need a transformation but I do not see an esri transformation for it. I understand that the ellipsoids are almost the same. NOAA/NOS's VDatum: A tutorial on datums 


What is the recommendation for dealing with this?