[GRASS-user] Re: Import global maps (Ascii, png or KLM) from riverthreat.net

[Johannes Radinger]

Hello Micha,

Thank you very much for your help. The EPSG:4326 coordinate system
was the thing I was looking for!

/johannes


-------- Original-Nachricht --------
> Datum: Mon, 15 Aug 2011 12:30:28 +0300
> Von: Micha Silver <micha at arava.co.il>
> An: Johannes Radinger <JRadinger at gmx.at>
> CC: grass-user at lists.osgeo.org
> Betreff: Re: [GRASS-user] Re: Import global maps (Ascii, png or KLM) from	riverthreat.net

> 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" <JRadinger at gmx.at>
> > An: grass-user at lists.osgeo.org
> > 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
> > 
> > 
> 
> 
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