[GRASS-dev] [GRASS GIS] #1130: Request for a v.count.points grass module

[GRASS GIS]

#1130: Request for a v.count.points grass module
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 Reporter:  nikos                                                              |       Owner:  grass-dev@…              
     Type:  enhancement                                                        |      Status:  new                      
 Priority:  normal                                                             |   Milestone:                           
Component:  Vector                                                             |     Version:  unspecified              
 Keywords:  count points in areas, v.count.points.sh, v.what.vect, v.distance  |    Platform:  Unspecified              
      Cpu:  Unspecified                                                        |  
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 Currently there is no dedicated grass module to return the number of
 points that fall inside an area. Although there is a specific function to
 check if points fall within an area [1], the task is performed indirectly
 using v.what.vect [2] (which in turn is a wrapper to v.distance) in a
 script (e.g. v.count.points.sh [3]). Indirect methods (such as the
 previously mentioned script) work fine but take (impractically) too long
 when using (very) large point and area vector maps.[[BR]]

 Counting points is rather a common task within the framework of GIS.
 Therefore, it probably makes sense to have a native (faster and easy to
 use) grass module that returns the number of points within area(s) and
 optionally carry over attributes from the area to the point map (like
 v.what.vect) or/and vice versa. Potentially, such a module can replace
 completely the v.what.vect script (?).[[BR]]

 A discussion upon the subject is to be found in the grass-dev mailing list
 [4].[[BR]]

 [1]
 http://grass.osgeo.org/programming7/vector_2Vlib_2area_8c.html#a20344aaee88bf684dccdd2071da0851d
 [[BR]]
 [2] http://svn.osgeo.org/grass/grass/trunk/scripts/v.what.vect/ [[BR]]
 [3] http://wiki.iosa.it/dokuwiki/spatial_analysis:feature_count [[BR]]
 [4] http://lists.osgeo.org/pipermail/grass-dev/2010-August/051471.html
 [[BR]]

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Ticket URL: <http://trac.osgeo.org/grass/ticket/1130>
GRASS GIS <http://grass.osgeo.org>