Clutter development - tips, tricks, resources ?

[primig]

Can anyone share any documents, tutorials, guidelines for creating clutter maps?
Any tools for automating the process working from free online mapping?

Any tips, tricks, or other resources shared will be greatly appreciated!

[primig]

For an area I am working in, I see very nice & detailed 3d building and forest info in Google Earth.
Does anyone know of methods to pull this data out of Google earth (perhaps in Google sketch up) as shp files or other ?