Land planning software used includes:
* Google Earth/Google maps
* Google SketchUp (especially for urban planning)
* Vexcel GeoSynth and other 3D data acquisition and object reconstruction software (see http://en.wikipedia.org/wiki/3D_data_acquisition_and_object_reconstruction )
The collection of the allready made models of the blog can be found at http://sketchup.google.com/3dwarehouse/cldetails?mid=22dcc1f179dd50c0d2278629cdec3002&prevstart=0
