Re: [GRASS-dev] Extract vector features from external PostGIS layer without building topology

[nik]

À Dimanche 6 août 2017, Martin Landa a écrit :
> Hi,
> 
> 2017-08-06 8:38 GMT+02:00 Nikos Alexandris :
> > I am looking for a confirmation that the following is _not_ possible:
> >
> > v.external -b input="PG:host=somehost user=someuser dbname=somepgdb"
> > layer=somemaplayer
> >
> > then
> > v.extract input=somemaplayer output=somemaplayer_extract where="some sql
> > query"
> 
> currently `v.extract` requires topology [1]. It would be possible to
> modify it in order to operate also on level 1 (no topology). At least
> for points it would make sense. For areas you always need topology
> built. Ma
> 
> [1] 
> https://trac.osgeo.org/grass/browser/grass/trunk/vector/v.extract/main.c#L188
>

Than you Martin,
N
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Re: [GRASS-dev] Extract vector features from external PostGIS layer without building topology

[Martin Landa]

Hi,

2017-08-06 8:38 GMT+02:00 Nikos Alexandris :
> I am looking for a confirmation that the following is _not_ possible:
>
> v.external -b input="PG:host=somehost user=someuser dbname=somepgdb"
> layer=somemaplayer
>
> then
> v.extract input=somemaplayer output=somemaplayer_extract where="some sql
> query"

currently `v.extract` requires topology [1]. It would be possible to
modify it in order to operate also on level 1 (no topology). At least
for points it would make sense. For areas you always need topology
built. Ma

[1] 
https://trac.osgeo.org/grass/browser/grass/trunk/vector/v.extract/main.c#L188
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[GRASS-dev] Extract vector features from external PostGIS layer without building topology

[Nikos Alexandris]

Dear devs,

I am looking for a confirmation that the following is _not_ possible:

v.external -b input="PG:host=somehost user=someuser dbname=somepgdb" 
layer=somemaplayer

then 


v.extract input=somemaplayer output=somemaplayer_extract where="some sql query"

?

Building topology is required, here. Right?

Thank you, Nikos


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