[GRASS-user] r.patch for stitching rasters?

[Boris Avdeev]

Yes, though I couldn't figure out how to make gdal_merge output NULLs
instead of 0s (and what formats support NULLs?).
But anyway, you think that this is normal performance?

On Nov 16, 2007 2:08 PM, Dylan Beaudette <dylan.beaudette at gmail.com> wrote:
> On Friday 16 November 2007, Boris Avdeev wrote:
>
> > Now, when you asking...
> > Now it is this:
> >
> > projection: 3 (Latitude-Longitude)
> > zone:       0
> > datum:      wgs84
> > ellipsoid:  wgs84
> > north:      48:50:24.701676N
> > south:      34:38:56.353164N
> > west:       45:57:00.735336E
> > east:       55:00:56.276712E
> > nsres:      0:01:00.033312
> > ewres:      0:00:59.991804
> > rows:       851
> > cols:       544
> > cells:      462944
> >
> > But I believe that at the time I started r.patch it was this:
> >
> > projection: 3 (Latitude-Longitude)
> > zone:       0
> > datum:      wgs84
> > ellipsoid:  wgs84
> > north:      46N
> > south:      35N
> > west:       35E
> > east:       55E
> > nsres:      0:00:03
> > ewres:      0:00:03
> > rows:       13200
> > cols:       24000
> > cells:      316800000
> >
> > since I was trying to preserve resolution of original srtms.
> >
> > Boris
> >
>
> That is pretty big, but not impossibly big. Have you considered something like
> gdal_merge.py for merging the files outside of GRASS ?
>
> cheers,
>
> Dylan
>
>
> >
> > PS Sorry Dylan
> >
> > On Nov 16, 2007 12:49 PM, Dylan Beaudette <dylan.beaudette at gmail.com> wrote:
> > > On Friday 16 November 2007, Boris Avdeev wrote:
> > > > Hello grass (ab)users!
> > > > I am using r.patch to merge 200 1 degree, 3 seconds resolution srtm's
> > > > (1-2 Mb each). After 24 hours of real time and 20 hours of Xeon
> > > > processor time I have 39% completed! My guess that this task shouldn't
> > > > take so long. Is r.patch a wrong tool to do this thing? Or is it a
> > > > bug? I am using grass-6.3.cvs.
> > > >
> > > > Thanks,
> > > > Boris
> > >
> > > check region extents and resolution ... can you send the output from
> > > g.region -p ?
> > >
> > > Dylan
> > >
> > >
> > > --
> > > Dylan Beaudette
> > > Soil Resource Laboratory
> > > http://casoilresource.lawr.ucdavis.edu/
> > > University of California at Davis
> > > 530.754.7341
>
>
>
> --
>
> Dylan Beaudette
> Soil Resource Laboratory
> http://casoilresource.lawr.ucdavis.edu/
> University of California at Davis
> 530.754.7341
>