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Arc Desktop has trouble correctly projecting from ETRS to UTM?

Question asked by Zemken12_1 on May 31, 2016
Latest reply on Jun 2, 2016 by MKennedy-esristaff

Task is to project a DEM from ETRS_1989_UTM_Zone_30N to WGS 84 / UTM zone 29N. Easy enough right? Process succeeds, but inaccurately.

I have recently read on this ESRI Geonet post by Melita Kennedy  that ArcDesktop has issues with this projection because of the following:

Some LAEA data uses a sphere rather than an ellipsoid/spheroid which if the metadata isn't correct can cause problems when the data is reprojected.

I tried to redefine the projection from ETRS to LAEA like the link above states. No luck.