[GRASS-user] r.stream.extract error

[Giuseppe Amatulli]

Hi Markus  M.

I was testing the r.stream.extract for 2 tiff

1) 80040 x 72870 = 5,832,514,800 i got the stream results - no error

2) 80490 x 142690 = 11,485,118,100 i got the following error

A* Search...
0..2../var/spool/slurmd/job6514787/slurm_script: line 80: 28925 Bus error
            r.stream.extract elevation=elv accumulation=upa threshold=0.5
depression=dep direction=dir stream_raster=stream memory=45000 --o --verbose

Do you think that is something with the slurm ram limitation or is
something with the r.extract.stream?
If the the stream output have a number of stream segments larger than
2,147,483,647 what is happen?
Do I get an error or all the value larger than   2,147,483,647 are just
rounded to 2,147,483,647 ?


Moreover, if use the stream obtain from option 1) and I use the stream as
input for the r.stream.basins
I got the following error

reading raster map <stream>...
0..3..6..9..12..15..18..21..24..27..30..33..36..39..42..45../var/spool/slurmd/job6514788/slurm_script:
line 82: 17687 Bus error
/gpfs/home/fas/sbsc/ga254/.grass7/addons/bin/r.stream.basins -l
stream_rast=stream direction=dir

is this something that need to be fixed in r.stream.basins, or should i
think that is due to other problems

Thank you
Giuseppe




On 10 November 2017 at 11:21, Markus Neteler <neteler at osgeo.org> wrote:

> On Wed, Nov 1, 2017 at 10:12 PM, Markus Metz
> <markus.metz.giswork at gmail.com> wrote:
> > On Wed, Nov 1, 2017 at 7:15 PM, Giuseppe Amatulli
> > <giuseppe.amatulli at gmail.com> wrote:
> >>
> >> Thanks Markus!!
> >> I will test and I will let you know how it works.
> >
> > Your feedback is very helpful!
> >>
> >> I have few  more questions
> >> 1) now how much is the upper limit matrix cell number that
> >> r.stream.extract can handle?
> >
> > About 1.15e+18 cells.
> >
> > Another limitation is the number of detected stream segments. This must
> not
> > be larger than 2,147,483,647 streams,
> ...
>
> (Added as a note to
>  https://grasswiki.osgeo.org/wiki/GRASS_GIS_Performance#Some_benchmarks
> )
>
> best,
> markusN
>



-- 
Giuseppe Amatulli, Ph.D.

Research scientist at
Yale School of Forestry & Environmental Studies
Yale Center for Research Computing
Center for Science and Social Science Information
New Haven, 06511
Teaching: http://spatial-ecology.net
Work:  https://environment.yale.edu/profile/giuseppe-amatulli/
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