[GRASS-dev] [GRASS GIS] #1798: all relevant vector modules should have cats and where parameters

[GRASS GIS]

#1798: all relevant vector modules should have cats and where parameters
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 Reporter:  mlennert              |       Owner:  grass-dev@…              
     Type:  enhancement           |      Status:  new                      
 Priority:  normal                |   Milestone:  7.0.0                    
Component:  Vector                |     Version:  svn-trunk                
 Keywords:  where cats parameter  |    Platform:  Unspecified              
      Cpu:  Unspecified           |  
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Comment(by mlennert):

 Replying to [comment:1 glynn]:
 > Replying to [ticket:1798 mlennert]:
 > > A series of vector modules should have cats and where parameters
 allowing the user to apply the operation only on selected features. Having
 this options avoids having to create many intermediate maps. And for a
 more homogeneous user experience it would be nice to have them in all
 modules, unless irrelevant.
 >
 > Would it be feasible (and desirable) to allow the creation of "views"
 (virtual maps which obtain their data from an underlying map), similar to
 v.external or raster "reclass" maps?

 I don't know enough about the "feasible" question, but I agree that it
 might be worth looking at this option. At the same time, I really
 appreciate the flexibility of doing the "on-the-fly" selection that the
 cats and where parameters allow.

 Imagine the case where you have 100 points and want to create individual
 buffers around each, i.e. you can't call v.buffer on all at once as this
 will fusion the buffers. With views you have the extra step of having to
 create a view for each cat before calling v.buffer, with the cats/where
 options you can just call v.buffer. But I'm aware that we're talking
 luxury problems here, and that views that can be called like normal maps
 would allow us not to have to worry about this for each new module (and
 especially addons).

 Moritz

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Ticket URL: <http://trac.osgeo.org/grass/ticket/1798#comment:3>
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