Hi, I have been trying to figure out how to create a GRASS location for the native projection of Smith and Sandwell's 1-minute global elevation v9.1b, August 21, 2007. http://topex.ucsd.edu/marine_topo/mar_topo.html (dataset is 712mb uncompressed)
Data is given as simple Mercator on a sphere, the same as GMT's "img2grd -D". I wish to eventually corellate with or reproject into WGS84 lat/lon, but to minimize loss of information I prefer to work with the original data as long as possible. I have a working method using img2grd; g.region; grd2xyz | r.in.xyz. Although I am still a bit unsure about the north-south resolution, it all seems to line up well with a world coastline vector overlay. img2grd -> grdreformat =bf to convert into an old GMT native file which r.in.bin's -h flag knows about seems to harm the data. more notes and ideas about it here: http://grass.osgeo.org/wiki/Marine_Science#Bathymetric_data has anyone solved this before? eventually I would like the clean up the above wiki page with a clear mini-howto for using this data with GRASS. thanks, Hamish ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
