I know that both WRF and WPS both assume a spherical earth model with a radius of 6370km. I'm looking to display the data onto the WGS-84 Ellipsoid model. While I'm primarily concerned with the continental US I will eventually want to do this for the entire globe.
I've found information, most notably here: http://computing.io/wp/2016/01/wrf-lati ... nd-datums/
That suggests that WPS and WRF may just be treating the WGS-84 information in the land-use data as spherical earth information and this suggest using the XLAT and XLONG output directly from WRF and putting it onto the WGS-84 Ellipsoid. This doesn't sound 100% correct however, and certainly wind information would need to be transformed slightly differently as well well some other information, in particular I would expect the geopotential height may need to be adjusted for the change in surface shape.
I know that to do transforms between Ellipsoids I'd need to use one of the Helmert, Molodensky-Badekas, or Molodensky methods. Have any of you gone down this road before and if so how did you go about transforming the data?