From Free Government Information (FGI), these are sites that let you download a file and see the results in Google Earth. For more sites, click here. Also check various government GIS sites. They are creating KMZ files from their data for use in Google Earth.
Render three-dimensional data and maps with ease. Written as a self-study workbook, Introduction to 3D Data demystifies the sometimes confusing controls and procedures required for 3D modeling using software packages such as ArcGIS 3D Analyst and Google Earth. Going beyond the manual that comes with the software, this profusely illustrated guide explains how to use ESRI's ArcGIS 3D Analyst to model and analyze three-dimensional geographical surfaces, create 3D data, and produce displays ranging from topographically realistic maps to 3D scenes and spherical earth-like views.
Start building your 3D model today with a comprehensive guide to SketchUp 2014. SketchUp 2014 For Dummies is a user-friendly guide to creating 3D models, adding textures, creating animated walkthroughs, and more, using one of the most popular 3D modeling programs on the market.