In order to edit a scanned drawing in CAD, you first need to convert the scan to CAD format using raster to vector conversion software.
A number of raster to vector software options are available, including the following:
Autodesk University 2011 Conference and Exhibition (USA)
ECOBUILD America 2011 Conference and Exhibition (USA)
Colortrac at ESRI User Conference - San Diego July 2011
Colortrac launches new Professional MFP solutions based on the SmartLF wide format scanners
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