The SRTM 90m DEM’s have a resolution of 90m at the equator, and are provided in mosaiced 5 deg x 5 deg tiles for easy download and use. All are produced from a seamless dataset to allow easy mosaicing.
These are available in both ArcInfo ASCII and GeoTiff format to facilitate their ease of use in a variety of image processing and GIS applications. Data can be downloaded using a browser or accessed directly from the ftp site. The data processing is currently ongoing. Online DEM data on this site will be updated in mid-2005, with future improvements to include clipping of shorelines and improved interpolation of voids (using GTOPO30 global topographic data).
To access the data simply click the Data Search & Download option (left sidebar). You are then presented with a dialog to enter the bounding coordinates, or you can select tiles from a map. Click Search and then once a file(s) is found you can download via ftp or http… nice! Note: as a test I selected a file in the Pacific NW… one tile was 45 MB in size. For small-scale mapping projects these data will likely become the DEM data of choice!
Today’s TOP news! Trimble Adds Satellite Imagery Data Support