Le 02/11/2018 à 22:27, Markus Metz a écrit :
On Fri, Nov 2, 2018 at 6:32 PM Frank David <frank.da...@geophom.fr
<mailto:frank.da...@geophom.fr>> wrote:
>
> Le 02/11/2018 à 14:43, Markus Metz a écrit :
>
>
>
> On Fri, Nov 2, 2018 at 11:58 AM Frank David <frank.da...@geophom.fr
<mailto:frank.da...@geophom.fr>> 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
<frank.da...@geophom.fr <mailto:frank.da...@geophom.fr>> 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...
import of the shapefile with v.in.ogr takes here 5 minutes
v.extract takes here 27 seconds instead of 1 hour
"here" means a laptop with Intel Core i7 4th generation and standard
SATA SSD, i.e. no fancy new high-speed system at all.
I am afraid this does not help you. What could take long is writing
attributes, depending on the database connection. I am using the
default sqlite database.
You could use top to check if v.extract is running at 100%.
Hello Markus,
Thank you for your help.
I'm trying to do again the operation on local machine. I want fisrt,
create a vector with only selected data (on full France area). But I've
met a problem with v.extract.
v.extract --overwrite --verbose input=CLC12_FR_RGF@PERMANENT type=area
where=CODE_12 IN (111,112,121,311,312,313,324)
output=CLC12_FR_RGF_BOISBATI@PERMANENT
Loading categories from table <CLC12_FR_RGF>...
DBMI-DBF erreur de pilote :
SQL parser error (syntax error, unexpected NAME processing
'IN') in statement:
SELECT cat FROM CLC12_FR_RGF WHERE CODE_12 IN
(111,112,121,311,312,313,324)
Unable to open cursor.
DBMI-DBF erreur de pilote :
SQL parser error (syntax error, unexpected NAME processing
'IN') in statement:
SELECT cat FROM CLC12_FR_RGF WHERE CODE_12 IN
(111,112,121,311,312,313,324)
Unable to open cursor.
ERROR: Unable select records from table <CLC12_FR_RGF>
It looks that grass does not recognized "IN" sql condition. If I force
layer=-1, it runs bur the output vector is the same as input one.
Am I wrong somewhere ? I use Grass 7.4.2 on debian9.
Thank you for your help.
Frank
Markus M
>
> 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 <frank.da...@geophom.fr
<mailto:frank.da...@geophom.fr>> 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
> > >> _______________________________________________
> > >> grass-user mailing list
> > >> grass-user@lists.osgeo.org <mailto:grass-user@lists.osgeo.org>
> > >> https://lists.osgeo.org/mailman/listinfo/grass-user
> > >
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