[GRASS-user] i.segment

GRASS GRASS user
1

Hi,

My name is Francesco and I’m very new with GRASS.

I tried to use the i.segment command and I got a problem.

The command lines I used are the following:

i.segment -d group=060140_file_OFD output=060140_file_segs_L1 threshold=0.1
i.segment -d group=060140_file_OFD output=060140_file_segs_L2 threshold=0.2 seeds=060140_file_segs_L1 min=2

the lines are very similar to the example provided in the tutorial:

http://grass.osgeo.org/grass70/manuals/i.segment.html

Anyway, when I run the second line, the output window return the following message:

WARNING: Region consists of only one cell, nothing to update

and the process doesn’t run.

I tried to change the parameters, but the result was always the same.

What is my mistake?

Thank you!

Francesco

Francesco Nex, PhD

3D Optical Metrology Unit (3DOM)

Bruno Kessler Foundation (FBK), Via Sommarive 18, 38123, Trento

Telephone: 0461 3146150461 314615

Web: http://3dom.fbk.eu/en/nex

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2

On 30/06/14 12:09, Francesco Nex wrote:

Hi,

My name is Francesco and I'm very new with GRASS.
I tried to use the i.segment command and I got a problem.
The command lines I used are the following:

i.segment -d group=060140_file_OFD output=060140_file_segs_L1 threshold=0.1
i.segment -d group=060140_file_OFD output=060140_file_segs_L2
threshold=0.2 seeds=060140_file_segs_L1 min=2

the lines are very similar to the example provided in the tutorial:

http://grass.osgeo.org/grass70/manuals/i.segment.html

Anyway, when I run the second line, the output window return the
following message:

WARNING: Region consists of only one cell, nothing to update

This means exactly what it says: the working region (i.e. the grid in which you want to work) consists of only one cell.

Update your region with g.region before running i.segment.

Moritz