This is the SRTM home page. The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February of 2000.

http://www2.jpl.nasa.gov/srtm/



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Note added at 12 mins (2011-08-25 13:19:48 GMT)
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STRM map files are integrated in GoogleEarth.

http://www2.ihe.nl/we/staff/spa/GIS-RS-Hydro/notes/GIS_hyinf...

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Note added at 3 hrs (2011-08-25 16:09:28 GMT)


It seems that the 'r' and 't' are mixed up here (appearances of the acronym in the title and body are different):

Validation and comparison of SRTM and ASTER/GDEM in the Tibetan Plateau using ICESat/GLAS data

Both the Shuttle Radar Topographic Mission (STRM) topography and the Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM) have been widely used in hydrology, climatology, glaciology, and others since they were made access to the public.

http://adsabs.harvard.edu/abs/2010AGUFM.C41A0493F

SRTM seems to be the right form.

Shuttle Radar Topography Mission

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Note added at 3 hrs (2011-08-25 16:27:29 GMT)
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http://www.infomar.ie/documents/Ireland_Coverage_Chart_1Feb1...
We use chart

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Note added at 3 hrs (2011-08-25 16:28:25 GMT)
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I saw earlier answer as STRM so searched but it seems it has been corrected.......