[GRASS-user] r.patch: number of rasters

[razmjooeis at faunalia.co.uk]

Hi Markus

Many thanks for your response. In the past versions, the patched raster
used to have an odd values.

I use Grass 6.4 from Ubuntu 10.10 64 bit repo.

Cheers
Sab



> On Tue, Nov 2, 2010 at 2:03 PM,  <razmjooeis at faunalia.co.uk> wrote:
>> Dear all
>>
>> Is there a limit on the number of rasters for r.patch?
>
> How funny, we had the same question at the same time... :)
> From GRASS 6.4+ there is no more limit despite the limit of open files per
> process (which depends on the operating system; for Linux it is
> usually 1024 files).
>
> To increase that:
>
> The limit of open files per process was reached (64bit Linux: 1024
> files; ulimit -n)
> To overcome this limit, the "nofile" parameter needs to be increased in
> the
> /etc/security/limits.conf
> file. Here an increase to 1500 files (use * instead of neteler to aply
> it to all users):
>
> #<domain>      <type>  <item>         <value>
> neteler               hard    nofile          1500
>
>
> --------------------
> But myself, I got troubles when having registered the maps with
> r.external:
>
> GRASS 6.4.1svn (patUTM32):~ > r.patch in=`g.mlist type=rast
> pattern=dtm00* sep=comma mapset=dtm_1m_external` out=dtm_trentino_2m
> ERROR 1:
> TIFFOpen:/geodata/base_cartography/pat_DTM_LIDAR_2007_UTM_WGS84/geotiffs/dtm000501.tif:
> Too many open files
> WARNING: Unable to open
>        '/grassdata/patUTM32/dtm_1m_external/cell_misc/dtm000501/f_format'
> WARNING: quantization file [dtm000501] in mapset [dtm_1m_external] missing
> WARNING: Unable to open raster map <dtm000502 at dtm_1m_external>
> ERROR: One or more input raster maps not found
>
> So far I could not find out the reason. Here I am using 500 files
> registered
> with r.external.
>
> Help welcome,
> Markus
>