I am having about 700 LiDAR tiles (~4 GB). Did it a couple of hours ago and all worked well...the DTM looks as I expected!
The problem I had last year when I did it last, there were 1000+, values for one tile were changed. Never investigated the problem. Simply changed the region and things worked smoothly. Many thanks Sab On Tue, 2010-11-02 at 16:54 +0100, Markus Neteler wrote: > On Tue, Nov 2, 2010 at 4:41 PM, <razmjoo...@faunalia.co.uk> wrote: > > Hi Markus > > > > Many thanks for your response. In the past versions, the patched raster > > used to have an odd values. > > No, this is rather impossible (perhaps you refer to the odd number of pixels > in a moving raster window). > > > I use Grass 6.4 from Ubuntu 10.10 64 bit repo. > > Master question: how many files do you plan to patch? > > Markus > > > Cheers > > Sab > > > > > > > >> On Tue, Nov 2, 2010 at 2:03 PM, <razmjoo...@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 <dtm000...@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 > >> > > > > > > _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user