On Fri, Nov 2, 2018 at 6:32 PM Frank David <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> 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> 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%. 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> 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 > > >> https://lists.osgeo.org/mailman/listinfo/grass-user > > > > > > _______________________________________________ > > > grass-user mailing list > > > grass-user@lists.osgeo.org > > > https://lists.osgeo.org/mailman/listinfo/grass-user
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