On Mon, 2011-08-15 at 10:24 +0200, Johannes Radinger wrote: > Hello again! > > Just to follow up my last weeks question: > Is there anyone who can help me how to import a map from > riverthreat.net? What are the appropriate settings of the > coordinate system? and how do I have to import the raster > maps? For more info just see email below. >
I tried with the ASCII formatted data and it works fine using the GRASS r.in.arc module. Here are the steps: Create a GRASS location based on the EPSG:4326 coordinate reference system, and set its region to the whole world, with resolution 0.5 deg: g.region e=180 w=-180 n=90 s=-90 res=0.5 -p Download the ASCII file. I had to make one small change in the ARC/Info headers: the NOVALUE number should be an integer, so just change it to -9999 (instead of -9999.00000). Now: r.in.arc Pesticide_Loading.asc out=pesticide and display the resulting raster. -- Micha > thank you very much > /Johannes > > > -------- Original-Nachricht -------- > Datum: Wed, 10 Aug 2011 12:43:42 +0200 > Von: "Johannes Radinger" <[email protected]> > An: [email protected] > Betreff: Import global maps (Ascii, png or KLM) from riverthreat.net > > Hello, > > I've a question concerning the import of raster maps into grass: > > On http://www.riverthreat.net/data.html it is possible to get > worldwide data on river threats and environmental pressures. The data > are provided either as images (png), ascii files or Google-Earth KLM files > with a resolution of 30 seconds (0.5 degrees). > > I'd like to import some of these maps into grass gis for further analysis. > Thus some questions arise: > > *Which coordinate system do I have to select so that the data are displayed > correctly? > * What is the best data format for the import? I think maybe Ascii? These > files have a header like following: > ncols 720 > nrows 360 > xllcorner -180.000000 > yllcorner -90 > cellsize 0.500000 > NODATA_value -9999.000000 > > Maybe you can help me with the import! > > Thank you very much > Johannes > -- > NEU: FreePhone - 0ct/min Handyspartarif mit Geld-zurück-Garantie! > Jetzt informieren: http://www.gmx.net/de/go/freephone > > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
