On 01/07/13 21:04, Markus Metz wrote:
On Mon, Jul 1, 2013 at 3:56 PM, Moritz Lennert
<mlenn...@club.worldonline.be> wrote:
Hi Eric and Markus,
Trying to use i.segment in grass7 checked out and compiled a few days ago
(rev 56918), I came upon the following error and the resulting segments file
was not created. I can file this as a bug report, but wanted your feedback
first to see if I'm misusing i.segment somehow. I haven't been able to find
the error in the source code.
command line:
time i.segment group=xs out=seg_xs minsize=2 memory=3072 threshold=0.2 --o
error:
Segmentation converged after 16 iterations.
Merging segments smaller than 2 cells
ERREUR :Ri is 0
This should not happen. The ID of a segment is always positive or
negative or NULL (Rast_is_c_null_value())
This is on a mosaic of Worldview 2 images with region specs as follows:
g.region -p
projection: 1 (UTM)
zone: 33
datum: wgs84
ellipsoid: wgs84
north: 4876400
south: 4849792
west: 610056
east: 634648
nsres: 2
ewres: 2
rows: 13304
cols: 12296
cells: 163585984
The mosaic is only a narrow band within that region, so that actually there
are only 34,755,878 non-null cells.
Any hints ?
Not really. I created a sample dataset with a MASK leaving only a
narrow diagonal strip and everything went fine.
I did not use a mask, the non-relevant cells were just nulls. Would it
be better to create a mask ?
Did you get any other
warnings while running i.segment?
No.
I assume you are using 64 bit Linux
$ uname -srvm
Linux 3.2.0-4.drm-amd64 #1 SMP Debian 3.2.35-3~jcristau.1 x86_64
(Intel i3)
with more than 3072 GB RAM
Yes. I have 8GB. There were two segmentation processes running at the
same time, both with memory=3072. The other process ran without error
(but on a smaller region and image).
and lots of free disk space on the
partition with your GRASS data.
61G on the data partition.
Can you provide data to replicate or commands using one of the sample
datasets to replicate this error?
I'll run the segmentation again without having something else running.
If I can reproduce the error, I'll make the data available to you so you
can test.
Thanks !
Moritz
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