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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.

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This is far too broad, please try to break it in several smaller and more objective questions. –  Luís de Sousa Feb 13 at 13:31
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Hi, I don't think the question can be divided into any more questions, the thing is that 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. I hope it clear now, thanks ! –  Akheloes Feb 13 at 13:53
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That detail needs to be in the question (not lost in a comment). Please click edit below the question to update it with this important information. –  BradHards Feb 13 at 21:12
    
Ok, let me do that @BradHards ! –  Akheloes Feb 13 at 23:38
    
@gloserio: In which software you want to use the DGW after the DWG is converted? If you want to use it in ArcGIS you do not need to reproject it to a new DWG. ArcGIS is can reproject a DWG on-the-fly. –  Jens Feb 14 at 6:46

1 Answer 1

up vote 3 down vote accepted

You can use AutoCAD Map 3D to reproject DWGs. The transformation of the datum is supported in this process too.

The steps are well documented in AutoCAD Map 3D help: Use AutoCAD Map 3D > Task Workflows > Work with Coordinate Systems > Transform a DWG File to a Different Coordinate System

Here's a summary:

  • Create a new DWG
  • Assigning the target coordinate system to the new DWG
  • Attach original drawing
  • Query all objects from attached DWG
  • Detach DWG
  • Save new DWG.
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Oh, many thanks ! I looked it up, seems like it's not the standard autocad, is it an extension ? –  Akheloes Feb 13 at 16:30
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AutoCAD Map 3D is a desktop GIS while AutoCAD is a CAD. AutoCAD Map 3D is bases on AutoCAD but it is a seperate product/license. –  Jens Feb 14 at 6:42

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