title: Topographical or relief data in Map APIs
body: <p>I was wondering if anyone knew of any map APIs that offer topographical or relief data?  I've had a quick look at Google and Bing APIs, but could find nothing there.</p>
  
  <p>Google allow you to view a map as TERRAIN, which means you can see the topography of a map, but I want to be able to get at that data - i.e. if I were to draw a line between 2 points on Google Maps, I want to know how high above see level points along that line are.</p>
  
  <p>Is this possible with any map APIs out there?</p>
  
  <p>Thanks for your time!</p>