3D roof model creation - data and workflow

[GagagDa_Morvi]

What is the best approach / workflow to create roof model of buildings in some kind of automated (or semi-automated) process? What kind of dataset would be required- LIDAR is one possibility but doesn't have wide coverage. Any thoughts or recommendations on the above

[SusanJones]

Amit Kokje and myself put together a working prototype for the ESRI South East Asia Conference held in Auckland in 2012.

The 2 necessary datasets were lidar and building foot prints. With these, there is enough 3D and Geoprocessing capabilities in arcpy to formulate the roof top delineation prediction algorithm.