Hi,

2017-08-06 8:38 GMT+02:00 Nikos Alexandris <n...@nikosalexandris.net>:
> 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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