Well, you can get the terrain information. See
hereHowever, as I have developed other Google maps applications, you should be aware that there are a licensing concerns to take into consideration.
1) Using Google Maps in a desktop application requires an enterprise license - $20,000 per year
2) Storing Google Maps data, even without a desktop application (i.e. through a web application) requires a license
I'd read through the Google Maps API agreement and see if you can comply in your request or be prepared to dig really deep into your pockets.