[GRASS-user] i.segment and i.segment.stats errors

[Jamille Haarloo]

Dear Grass community,

I have been experimenting with i.segment, i.segment.uspo and
i.segment.stats on relatively small areas of a worldview-2 image.
After some success I tried i.segment and i.segment.stats on the entire area
of 19875 ha, but I kept getting the same errors with i.segment.stats. I
started using a mask to eliminate most of the matrix, to see if that
helped. It did not, so I started the process again in i.segment but with
the previous segmentation output as seed to reduce processing. This time I
also got an error with i.segment in 2 attempts with different parameters. I
looked for documentation, but I couldn't find any solutions and I rather
not mess with the scripts. I do get a raster-output which looks ok, but
i.segment.stats fails to create an attribute table for further analyses. My
questions are: Is the area too big (too much pixels)? Are there too many
segments? The count of the last output is 9054 segments. Or should I start
the process again form the beginning without the seed assuming the Mask is
not the problem? The processing might take several weeks though.

 i.segment error:
ERROR: Region of size 501508 should be in search tree

i.segment.stats errors:
ERROR: Error while executing: 'CREATE TABLE segmstat_tmp_vect_7968 (cat
int, area double precision, compact_circle double precision, DV2_mean
double precision, DV2_stddev double precision, DV2_variance double
precision, DV2_coeff_var double precision, DV2_first_quart double
precision, DV2_median double precision, DV2_third_quart double precision,
DV2_perc_90 double precision, DV4_mean double precision, DV4_stddev double
precision, DV4_variance double precision, DV4_coeff_var double precision,
DV4_first_quart double precision, DV4_median double precision,
DV4_third_quart double precision, DV4_perc_90 double precision, IDM2_mean
double precision, IDM2_stddev double precision, IDM2_variance double
precision, IDM2_coeff_var double precision, IDM2_first_quart double
precision, IDM2_median double precision, IDM2_third_quart double precision,
IDM2_perc_90 double precision, IDM4_mean double precision, IDM4_stddev
double precision, IDM4_variance double precision, IDM4_coeff_var double
precision, IDM4_first_quart double precision, IDM4_median double precision,
IDM4_third_quart double precision, IDM4_perc_90 double precision, W2_mean
double precision, W2_stddev double precision, W2_variance double precision,
W2_coeff_var double precision, W2_first_quart double precision, W2_median
double precision, W2_third_quart double precision, W2_perc_90 double
precision, DV4_mean double precision, DV4_stddev double precision,
DV4_variance double precision, DV4_coeff_var double precision,
DV4_first_quart double precision, DV4_median double precision,
DV4_third_quart double precision, DV4_perc_90 double precision,
neighbors_count double precision, area_nbrmean double precision,
area_nbrstddev double precision, compact_circle_nbrmean double precision,
compact_circle_nbrstddev double precision, DV2_mean_nbrmean double
precision, DV2_mean_nbrstddev double precision, DV2_stddev_nbrmean double
precision, DV2_stddev_nbrstddev double precision, DV2_variance_nbrmean
double precision, DV2_variance_nbrstddeGRASS_INFO_ERROR(7020,1):
Traceback (most recent call last):
  File "C:\Users\haarlooj\AppData\Roaming\GRASS7\addons/scri
pts/i.segment.stats.py", line 370, in <module>
    main()
  File "C:\Users\haarlooj\AppData\Roaming\GRASS7\addons/scri
pts/i.segment.stats.py", line 357, in main
    gscript.run_command('db.execute', input=insert_sql,
quiet=True)
  File "C:\Program Files\GRASS GIS
7.4.0\etc\python\grass\script\core.py", line 421, in
run_command
    return handle_errors(returncode, returncode, args,
kwargs)
  File "C:\Program Files\GRASS GIS
7.4.0\etc\python\grass\script\core.py", line 332, in
handle_errors
    returncode=returncode)
grass.exceptions.CalledModuleError: Module run None
['db.execute', '--q', 'input=Z:\\GRASS_GIS\\Cottica_LUP\\LUP
1\\.tmp/unknown\\7968.1'] ended with error
Process ended with non-zero return code 1. See errors in the
(error) output.
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