Elevation, actual meaning depends on the EPSG system being used. Usually in meters.
The EPSG code identifying the which geodetic datum, spatial reference system and earth ellipsoid is being used https://en.wikipedia.org/wiki/EPSG_Geodetic_Parameter_Dataset
Latitude, actual meaning depends on the EPSG system being used
Longitude, actual meaning depends on the EPSG system being used
Rotation of the model, in degrees. Should be normalized (0-360)
A GeoReference can be attached to a Version to geographically reference a Model.