SRTM DEM

NASA's Shuttle Radar Topography Mission data provides 90m DEM coverage for most of the earth's surface, from 60 °N to 60 °S, or approx 80% of the Earth's land surface. The DEM was created from dual stereoscopic radar signals and post-processing. The SRTM data does have some missing and "fuzzy" areas, which is one of its limitations. The DEMs offered by East View Cartographic at 90m resolution can serve as an excellent compliment for void areas.