ami_hml wrote:
I am not sure if this is the right place to ask
It's sure that you are in the wrong place, sir.
You googled "map autocad 3d", but here we talk about geographic maps, not about 'mapping a 2D image on a 3d object'...
Anyway, in Autocad vanilla you can do it easily: press F1 and learn all about the _RMAT command.