This is no directly related to amateur radio, anyway I decided that this site will be my place for interesting experiments also.
SRTM is an international research effort that obtained Digital Elevation Models (DEM) on a near-global scale from 56°S to 60°N, to generate the most complete high-resolution digital topographic database of Earth. More information about SRTM here.
The link below redirects to an “easy picker” page that I have developed, for easy access to SRTM data for Brazil territory (helps me a lot in my professional activities). It can be of interest for radio operators also (topographic information).