I've been asked this question by a friend of mine, and from my experience with Autocad (which is rather small), I can't remember if the software supports reprojecting layers from a projection/datum to an other projection/datum ; I guess my first question is : could it be done on Autocad ? Second question, which matters more to me -since I'm a GIS person - is : could it be done by ArcGIS or QGIS or any of the other GIS softwares ? I've done some research on the internet, it turns out that a georeferencing of a CAD file is possible in ArcGIS, but what's a georeferencing operation worth if the spatial reference of the file is wrong in the first place ?
Note : of course one can think of using the interoperability tool in ArcGIS, convert a DWG to a SHP, reproject the SHP then finally re-convert to DWG. I'm looking for a simplier solution.
Detailed description : we have a DWG file in the "Lambert Conical Conformal Zone 1 / Clark 1880" for Morocco, and we want to know if it can be possible to reproject it into "UTM Zone 30N" (WGS84). This question would've not had posed any problem if it was a Shapefile, as you would imagine. Thus, the question is in short : what are known ways to reproject DWG files from their spatial reference to a target spatial reference.