At 3-second resolution (1-second in the U.S.), SRTM grids offer superb regional to continental coverage. SRTM tiles are 1x1 degree, with 1200 cells per degree (3600/degree in the U.S.), and data volumes for the digital grids are roughly 350kb/1000sqkm at mid-latitudes. With seamless, consistent, nearly global coverage, and no data gaps due to clouds, these data are well-suited for large areas of interest.