I need to import a complex polygon shape file into AutoCAD (AutoCAD map 3D 2015). I can import using Mapimport command, I can use the shp attributes to split into different drawing layers etc.

What I am having problems with is that all the shared boundaries are creating duplicate lines in the drawing. The reason I am importing into CAD is to create topologies and for this there must be a single line between adjacent polygons,, not 2 shared lines on top of each other. Is there any way to prevent the duplicate lines during import or is there a way to get rid of it after import. I imported polygons as closed polylines.

  • 1
    You can build topology in AutoCAD MAP, too. Before it you have to use Drawing Cleanup to remove double borderlines.
    – Zoltan
    Dec 9, 2020 at 11:07
  • I have tried Drawing cleanup, but for some reason it is not deleting the duplicates. Do I need to first break crossing objects? Dec 10, 2020 at 6:16


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