Hamish wrote: > Richard Chirgwin wrote: > >> ... Having given up on the Australian Communications & Media Authority >> DEM because it won't import into Grass-GIS (there seems to be some >> fiddling to keep the DEM hidden behind a silly Windows app), >> > > with the exact file size, expected rows & columns, and possibly byte info > and geographic extent known about it we still might be able to give some > guesses about how to get around that. Or is it known for sure that they've > taken steps to encrypt it? > I will, perhaps, contact you offlist on that angle... >> I'm turning to other DEMs. >> >> The NASA SRTM seems as if it would suit my purposes, except that using >> r.in.srtm I get a lovely image with no elevation data. So r.what comes >> up with latitude, longitude, and null, eg: >> 150 | -34 | | * >> > > It probably worked, you just need to run g.region. > > I just tried: > wget ftp://e0srp01u.ecs.nasa.gov/srtm/version2/SRTM3/Australia/S34E150.hgt.zip > > Eeek. Yes, you're right, I forgot to run g.region at the end of the import. All is fine, and excuse the coming snip...
[snip] > Another way is get the data from Geoscience Australia's WMS server, > if you look in the capabilities XML file you will see that geotiff is > conspicuously missing from the available image formats: > http://www.ga.gov.au/wms/getmap?dataset=national&request=capabilities > > g.region n= s= w= e= res=... > r.in.wms -l -g mapserv="http://www.ga.gov.au/wms/getmap?dataset=national&" > > I imagine GA are much more GIS friendly than the media censors. > However, you may recall that the DEMs that GA served up weren't true DEMs - from an earlier conversation: > if you look in the capabilities XML file you will see that geotiff is > conspicuously missing from the available image formats: > http://www.ga.gov.au/wms/getmap?dataset=national&request=capabilities > (as you remarked to me back in April) Cheers and thanks for tolerating the dummy... Richard C > If you still have trouble with obtaining datasets, you might ask for help > on the OSGeo Aust-NZ mailing list. > > > >> QGIS imports and displays the HGT file okay, but misinterprets the >> elevation data as band data (so for Katoomba, 1000m above >> sea level, QGIS says the band is 1004). >> > > no idea. > > >> There aren't that many options in r.in.srtm, so I don't think I could >> have gotten any of them wrong... >> > > probably it worked ok you just have to adjust the zoom with g.region. > > > Hamish > > > > > > _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user