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

[Johannes Radinger]

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
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