Esri reprojection engine error: Specified geotransformation may be inappropriate

Liz Sanderson
Liz Sanderson
  • Updated

FME Version

  • FME 2015.x


Why am I getting the following warning message?
 Reprojector: Specified geotransformation `' (forward) may be inappropriate for reprojection from `LL-WGS84' (GCS: `GCS_WGS_1984') to `UTM83-10' (GCS: `GCS_North_American_1983') using the ESRI reprojection engine 


This warning appears because you are transforming between two different datums without a specified transformation.

The original NAD 83 and WGS 84 reference frames were equivalent (to within a meter) but since NAD 83 is tied to the North American tectonic plate and WGS 84 is a global average, they have diverged over the years. The issue is addressed more fully in this article from NOAA: Transformations Between NAD83 and WGS84.


Many still consider the two reference frames equivalent, so you may choose to ignore the warning. However, ArcGIS 10.1 and up has the transformation WGS_1984_(ITRF00)_To_NAD_1983 that you may wish to use for your reprojection.

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