#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 glynn):
Replying to [comment:6 mmetz]:
> The advantage of a virtual map over using v.extract to get a "permanent"
selection by cats/where is not clear to me
Disk usage. A virtual map wouldn't require an extra copy of the
coordinates and topology.
> because the result of v.extract can be processed faster than a virtual
map.
In the simplest case, a virtual map shouldn't be any slower than providing
cats=/where= on the command line; they both do the same thing. There may
be a difference in the case where you use where= when creating the virtual
map and again when processing it (i.e. you'd have to "compose" the where=
queries).
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Ticket URL: <http://trac.osgeo.org/grass/ticket/1798#comment:8>
GRASS GIS <http://grass.osgeo.org>
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