[GRASS-user] r.patch number of input limitation?

[Vaclav Petras]

On Wed, Sep 24, 2014 at 9:21 AM, Markus Neteler <neteler at osgeo.org> wrote:

> On Wed, Sep 24, 2014 at 2:40 PM, Robert Kuszinger <kuszinger at giscom.hu>
> wrote:
> >
> > Hello!
> >
> >
> > I'm trying to patch 1393 pieces of raster images with r.patch.
> >
> > before r.patch, the projection is set as follows:
> >
> >
> > projection: 3 (Latitude-Longitude)
> > zone:       0
> > datum:      wgs84
> > ellipsoid:  wgs84
> > north:      33:00:00.5N
> > south:      14:00:00.5S
> > west:       75:59:59.5E
> > east:       136:00:00.5E
> > nsres:      0:01:00.000355
> > ewres:      0:01:00.000278
> > rows:       2820
> > cols:       3600
> > cells:      10152000
> >
> > As you see, the target mosaic is set to be a moderate resolution by
> setting
> > es/nwres to 1 minute instead of seconds.
> >
> > I do then:
> >
> > GRASS 6.4.3 (wgs84pure):~/grassdata/import > MAPS=`g.mlist type=rast
> sep=,
> > pat="AST*"`
> > GRASS 6.4.3 (wgs84pure):~/grassdata/import > r.patch in=$MAPS out=mosaic
> > WARNING: Unable to open raster map <ASTGTM2N31E096 at seasdem2>
> > ERROR: One or more input raster maps not found
> >
> > How could it be? Is there a limitation on the string what r.patch is
> parsing
> > from the command line?
>
> It is indeed the operating system which limits the number of open
> files. For Linux, it is likely 1024 files.
> I have now added a note to the manual of r.patch (using those of r.series).
>
> Would it be possible to provide some possible reasons/suggestions in the
error message? (the wording should be that it is "possible reason")


> For a solution, see also
>
>
> http://grasswiki.osgeo.org/wiki/Large_raster_data_processing#Number_of_open_files_limitation
>
> You can increase this limit.
>
> Hope this helps,
> Markus
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