Le 02/11/2018 à 14:43, Markus Metz a écrit :
On Fri, Nov 2, 2018 at 11:58 AM Frank David <[email protected]
<mailto:[email protected]>> wrote:
>
> Le 31/10/2018 à 20:57, Markus Metz a écrit :
>
> Hi Frank,
>
> On Wed, Oct 31, 2018 at 1:39 PM Frank David <[email protected]
<mailto:[email protected]>> wrote:
> >
> > Hello Vero,
> >
> > Thanks for your reply. It took almost one hour to extract my area
(I guess because of topology). I do the same with Qgis from a shape in
less than 10 minutes (but with several operations)... it's may be a
bad idea to have a so heavy vector map in Grass...
>
> this kind of operation could be much faster in latest GRASS 7.4 than
in any previous versions. Which GRASS version are you using?
>
> Hello Markus,
>
> I'm using 7.4.1 on debian9
>
> But my grass db folder is on a small server (Synology NAS), so may
be the network makes slow down the operation ?
This is possible, but it should not slow it down that much: 10 min vs
1 hour
Can you provide a link to the vector from which you want to extract a
small area, and the command you used to extract a small area? Maybe
there is scope for optimization.
Markus,
The data is CorineLandCover for france. You can download 400mo here >
https://we.tl/t-tvldlmkVw3
First I have imported the shape in PERMANENT
and I do : v.extract --verbose input=CLC12_FR_RGF@PERMANENT
where=CODE_12 IN (111,112,131,311,312,313,324) output=clc12
Hope it helps you...
Cheers,
Frank
Markus M
>
> Cheers,
> Frank
>
>
> Markus M
> >
> > Cheers,
> >
> > Frank
> >
> > Le 31/10/2018 à 11:26, Veronica Andreo a écrit :
> >
> > Check v.extract or v.clip
> >
> > Cheers,
> > Vero
> >
> > El mié., 31 oct. 2018 7:20, Frank David <[email protected]
<mailto:[email protected]>> escribió:
> >>
> >> Hello,
> >>
> >> What is the best and fast way to make a copy of a part of vector map
> >> (national) to get a smaller territory ? (partial copy).
> >> Thank you for your advice !
> >>
> >> Frank
> >> _______________________________________________
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> >
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