[GRASS-dev] [GRASS GIS] #3184: v.vect.stats: errors in counts and statistics

GRASS GIS trac at osgeo.org
Sat Oct 22 14:40:44 PDT 2016

#3184: v.vect.stats: errors in counts and statistics
  Reporter:  veroandreo  |      Owner:  grass-dev@…
      Type:  defect      |     Status:  new
  Priority:  normal      |  Milestone:  7.2.0
 Component:  Vector      |    Version:  svn-trunk
Resolution:              |   Keywords:  v.vect.stats
       CPU:  x86-64      |   Platform:  Linux

Comment (by mmetz):

 Replying to [comment:10 veroandreo]:
 > Ahhh! Thanks for the explanation :)
 > So, I applied the second patch "instead" of the first one, and it works
 as expected, at least for the counts of points in polygons. I tested both
 with the test data previously attached and with data of my own. Thanks so
 much! I will test more and report back :)

 The patch to remove duplicate area categories seems correct to me, but
 does not account for the case when no area categories are found. This test
 is missing in the code anyway and should be done before removing duplicate
 area categories.
 > Regarding the statistics... I'm not sure how to, but even if the
 attribute data in the points is integer, wouldn't that be better to have
 the "real" average, standard deviation, etc., and not a truncated version
 of them??

 Right. The stats that can be integer are "category number of lowest
 value", "category number of highest value", and "number of different
 values", all else should be floating point. Count is treated differently
 (not a method option but triggered with the count_column option). This
 "half" addition of 0.5 comes from r.neighbors in G6 which is ignored by
 r.neighbors in G7.

Ticket URL: <https://trac.osgeo.org/grass/ticket/3184#comment:11>
GRASS GIS <https://grass.osgeo.org>

More information about the grass-dev mailing list