On 16/08/2011 5:00 pm, [email protected] wrote:
Message: 5 Date: Mon, 15 Aug 2011 12:30:28 +0300 From: Micha Silver
<[email protected]> Subject: Re: [GRASS-user] Re: Import global maps
(Ascii, png or KLM) from riverthreat.net To: Johannes Radinger
<[email protected]> Cc: [email protected] Message-ID:
<1313400628.8806.4.camel@SL6> Content-Type: text/plain;
charset="UTF-8" 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
Import with r.in.gdal doesn't require the files to be modified, e.g.:
r.in.gdal input=Biodiversity_Threat.asc out=Biodiversity_Threat -o
Josh.
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