Did you try to think CAD, GIS & BIM model can be worked together for doing visualization and simulation? Nowadays Autodesk LandXplorer Studio provides a platform, which can be easy to create a city model with your existing data model. Once the model is built, you can easy to navigate the city model and go to do the spatial-analysis e.g. Land-use, population distribution… With overlaying capability, it can be overlaid with another data format e.g. GIS data, CAD data, 3D model, Geo-referenced/ non-geo-referenced model …

Introduction of Autodesk LandXplorer Studio Professional

Simulate and Analyze Data within a City Model

Create and Visualize a City Model with Autodesk LandXplorer