[GRASS-dev] [GRASS GIS] #2699: g.gui.iclass doesn't run after selecting training areas

[GRASS GIS]

#2699: g.gui.iclass doesn't run after selecting training areas
-------------------------+--------------------------
  Reporter:  ThayseNery  |      Owner:  grass-dev@…
      Type:  defect      |     Status:  new
  Priority:  major       |  Milestone:  7.0.1
 Component:  wxGUI       |    Version:  7.0.0
Resolution:              |   Keywords:  g.gui.iclass
       CPU:  x86-64      |   Platform:  MSWindows 7
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Comment (by ThayseNery):

 Additional information, the image is landsat 8 OIL and the bands were
 convert from DNs to ToA Reflectance.

 The second error was fixed but I still got the first error when I select
 the imagery subgroup.

 Now I am able to run the model but the '''histogram shape''' does not
 follow the bell curve. According to the tutorial it should
 https://www.youtube.com/watch?v=FyzfdlkTNRg.
 [[Image(histogram2.jpg) attached]]

 Additionally, I don't see difference between the classes in the preview
 classification, when I select "agriculture" for example, in the preview
 shows that it takes the whole area, if I select "vegetation" it shows that
 this represents the whole area as well. I have selected 10 training areas
 for each class.


 Although the histogram doesn't look ideal, I was able to export the
 training areas to a vector map but I cannot import the vector into
 g.gui.iclass to rerun the analysis. I got the following error:

 Traceback (most recent call last): File "C:\Program Files (x86)\GRASS GIS
 7.0.0\gui\wxpython\iclass\frame.py", line 537, in OnImportAreas
 self.ImportAreas(vName) File "C:\Program Files (x86)\GRASS GIS
 7.0.0\gui\wxpython\iclass\frame.py", line 594, in ImportAreas
 self.poMapInfo = digitClass.OpenMap(vname, tmp = True) File "C:\Program
 Files (x86)\GRASS GIS 7.0.0\gui\wxpython\vdigit\wxdigit.py", line 1649, in
 OpenMap self.poMapInfo = self._display.OpenMap(str(name), str(mapset),
 update, tmp) File "C:\Program Files (x86)\GRASS GIS
 7.0.0\gui\wxpython\vdigit\wxdisplay.py", line 962, in OpenMap
 Vect_set_updated(self.poMapInfo, True) # track updated lines at update
 mode WindowsError: exception: access violation reading 0x000002E4

 I can see the vectors in the display. I opened the vector table of
 contents and I can see all categories, but the columns are empty and it is
 not specified how many training sample are within each class. It might be
 related to my histogram explained above [[Image(table_classes.PNG)
 attached]]


 Any suggestions on how I might fix it?

 Thanks for any help.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2699#comment:2>
GRASS GIS <http://grass.osgeo.org>