Original data were downloaded from
ftp://e0srp01u.ecs.nasa.gov/srtm/version2/SRTM30/

I have delete the downloaded data because I have merged them together.

The original nominal 1-km SRTM30 has 27 subsets with their
corresponding head files, Maosheng Zhao merged then together, and also convert
the original big-endian byte order into little endian.  For the original
central corner pixel based georeference, Maosheng Zhao also change it into
outer boundary based georeference so that the data is easy to use under most
cases.

SRTM30_merged.int16 is the merged short 2-byte little endian inetger SRTM30 nominal 1-km data
(0.00833333333333 degree resolution) and SRTM30_merged.int16.hdr is the ENVI
head file.  You can directly open the raw data combined the head file with
ENVI software. I have zipped the files with gzip, and you need to decompress when
using the data.

For MODIS purpose, I have also rewrite SRTM30 data as HDF-EOS Sinusoidal
10-degree tiles.

Note that for this version2 of SRTM30, there is no data south of latitude
of -60 degree, and therefore, no 10-degree tiles for v15, v16 and v17 of 
MODIS 10-degree SIN subset system. To obtain elevation data south of -60
latitude, you need to turn to GTOPO30 dataset.

Feb 23. 2009
Maosheng Zhao
zhao@ntsg.umt.edu