On February 25, 2015, two new NASA SRTM data sets were released by the LP DAAC.
The SRTM Swath Image Data (SRTMIMGR) consists of radar image files containing brightness values, as well as quality assurance (incidence angle) files for each of four overlapping sub-swaths that passes through a 1-degree-by-1-degree tile.
The SRTM Combined Image Data Set (SRTMIMGM) contains mosaicked 1-degree-by-1-degree images/tiles of uncalibrated radar brightness values at 1 arc-second. To create a smooth mosaic image, each pixel in an output is an average of all the image pixels for a location.
Contact LP DAAC User Services for further information.