[GRASS-dev] [GRASS GIS] #754: Deep Vector Bug: Overlay functionality flawed in v.select and v.in.ogr

[GRASS GIS]

#754: Deep Vector Bug: Overlay functionality flawed in v.select and v.in.ogr
-----------------------+----------------------------------------------------
  Reporter:  ploewe    |       Owner:  grass-dev@…              
      Type:  defect    |      Status:  closed                   
  Priority:  critical  |   Milestone:  6.5.0                    
 Component:  Vector    |     Version:  6.4.0 RCs                
Resolution:  invalid   |    Keywords:  v.overlay                
  Platform:  Linux     |         Cpu:  Unspecified              
-----------------------+----------------------------------------------------
Changes (by mmetz):

  * status:  new => closed
  * resolution:  => invalid


Comment:

 Replying to [comment:3 ploewe]:
 > Replying to [comment:2 mmetz]:
 > > Replying to [comment:1 martinl]:
 > > > > Sample data / Screenshots can be produced on request.
 > > >
 > > > Yes, please attach sample data e.g., in GRASS ASCII vector format.
 > > >
 > > +1, if the sample data are too large for attachment, please send them
 off-list as attachment.
 > >
 > > Could you also provide information about what were the exact commands
 you used, what do you want to happen with the overlapping areas i.e. which
 cleaning operations should be performed, and what should the desired
 result look like.
 > >
 > > Thanks,
 > >
 > > Markus M
 >
 > Done.
 > Two sample input data sets were attached as ESR! shapes to the ticket
 plus the result from v.patch as generated by grass6.4R5.
 > Here's the challenge: The two tile grids provided in the two input
 shapefiles partially overlap. The task is NOT to clean the topology (and
 to create new sub-polygons in the overlap area), BUT to  maintain the
 current polygon pattern, which implies that a number of poylgons overlap.

 Overlapping polygons are not supported in topological vector models,
 instead overlapping polygons are represented by areas with multiple
 categories. In this paricular case, the two shapefiles need to be imported
 at once with v.in.ogr, letting v.in.ogr do the topological cleaning.

 Closing ticket as invalid.

 Markus M

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/754#comment:5>
GRASS GIS <http://grass.osgeo.org>