Thanks for the useful hints Maciej. I tried to unzip (as the docs say) and found that they are not zipped. Then I tried to follow the Russian-doll-like descriptions of 'these are formatted like the previous releases' in the brief docs back to USGS EROS where I could not find (yet) a decent description of the format.
I'll try your suggestions. Michael On 10/13/07 8:27 AM, "Maciej Sieczka" <[EMAIL PROTECTED]> wrote: > Michael Barton wrote: >> Ultimately, I'm trying to locate bathymetry off the coast of Europe to >> create a DEM of Pleistocene Europe during times of low sea level (i.e., >> -300m). >> >> Following the FreeGIS.org link off the GRASS download data page, I found a >> site with "STRM30 plus" that combine 1km SRTM with bathymetry >> <ftp://topex.ucsd.edu/pub/srtm30_plus/data>. This seems just what I need. >> However, I can't figure out the format or how to import it into GRASS. The >> files show up like " w020n90.Bathmetry.srtm". I've tried r.in.gdal and >> r.in.strm to no avail. I thought maybe the files were compressed and tried >> to uncompress them without luck. >> >> Can anyone suggest what to do with these files? > > Michael, > > ftp://topex.ucsd.edu/pub/srtm30_plus/README.V2.0.txt: > > <snip> > DATA FORMATS > Data are provided as binary integers in exactly the same > format as SRTM30. The files must be uncompressed with gzip > and are 16-bit big endian byte order. > </snip> > > Other than they don't seem gzipped actually, the information > looks correct. These are 16 bit signed integer binary grids. > > You can use r.in.bin, or r.in.gdal if you create appropriate > header files (see r.in.srtm script for inspiration; note it > cannot work with 30" SRTM data as it is now - currently it > supports only 3" and 1" SRTM tiles). In the presence of > properly formatted *.hdr GDAL supports such binary grids > with "ESRI .hdr Labelled" driver [1]. In > ftp://topex.ucsd.edu/pub/srtm30_plus/ermapper_headers there > are ERmapper header files, which I suppose can be used to > prepare their GDAL-understandable version. > > [1] http://www.gdal.org/frmt_various.html#EHdr > > Maciek __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics & Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton _______________________________________________ grassuser mailing list grassuser@grass.itc.it http://grass.itc.it/mailman/listinfo/grassuser