topography

Topographical or relief data in Map APIs

Hi 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. 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 be...

How To Find Quad/Name/Scale From USGS Terra Server

I'm currently working on developing a Google Maps API implementation that overlays topographic data from USGS Terra Server. I think I have it pretty much under hand except that I can't figure out how to determine the name of the quad, name, & scale for the current tile being served from Terra Server. If you check out this site and zoom i...