For quick and easy data downloads, this portal has a nice user-friendly web interface which provides users three flexible options to choose, in order to selecting multiple tiles for downloading.
1. Multiple tile selection by clicking on tiles
2. Drag the mouse-point on top of the world map and mark & select the tiles
3. or, enter lat-long input coordinates.
The SRTM 90m DEM's have a resolution of 90m and 250m 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