More info: http://www.3d-map-generator.com/3d-map-generator-terrain/
This video shows how to create a textured 3D Terrain map with the 3d-Map-Generator-Terrain from Heightmapper website and Google Maps.
--- Note: All suggested heightmap services are not part of the 3D Map Generator – Terrain. They are just options for getting a grayscale heightmap. There is no guarantee of availability or functionality. ---