An article by Petervan Oosterom on www.directionsmag.com contained information about CAD being used with GIS. I listed some applications I gleaned from that article.
Plan development:
Initial planning and layout of large infrastructures is often done in GIS. CAD is used to help with the engineering and construction. During the design phase, geographic information is often transferred from a GIS to a CAD system. After the design is done in CAD, it gets re-imported into GIS.
Visualization:
Adding CAD to GIS can add a more realistic, multidimensional view. Perhaps even adding a CAD model, such as a proposed building, to a GIS layout.
Data collection:
CAD can add detail and precision to remote sensing and photogrammetry in pertaining to objects such as buildings, especially sub-surface constructions which cannot be surveyed from the outside.
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