let me re phrase the Mapping thing
and i’m not referring to the mapping node in cycles here !
NASA has something like 100 may be 150 methods of mapping a 2 D planet map to a 3 D sphere
depends on what distortions you want to accept and on type of distortions acceptable
the most used 2D map is the equiangular map (or cylindrical map ) like this one from NASA
now blender has only on method to map this type of 3D equiangular map as i know of
which in blender is call the equiangular method
and as i know of using warp to do it is not an official way for mapping 2D map to 3D sphere
it may be a nice trick but not an official one
so you may end up with all kind of distortions which are not as the real method
so if you want precision here you should use the offiicial method to get the most precise results
wiht known distortions
hope this clarify what i mean here
now i would like to see other map mapping methods added to blender
this would open up the field for mapping a little in blender
but don’t think that many peoples are interested in this field of science yet!