Google Maps Terrain Downloader is a tool that can automatically download the Google terrain maps images to your PC. It can download the small tiles and save them to your hard disk. After downloading, you can view the maps offline by its tool Maps Viewer, or you can combine the small images into one big map image. If you want to make a map of your city by yourself, it is very useful for you.
Note: The downloaded images are only for your personal purpose, non-commercial use.
It is very easy to use. Click here to see how to use it.
It is a shareware, for trial version, the max zoom level is 13, so you can not download high precision images. It costs you only $29.99!