Olav, You've probably solved your problem already, but you might like to have a look at this post I wrote about how to do that in several ways using SEXTANTE for QGIS
http://qgissextante.blogspot.fr/2012/11/spliting-vector-layer.html Thanks for the idea for the post :-) Victor 2012/11/20 Paulo van Breugel <[email protected]>: > Have a look at the v.kcv function in GRASS GIS > (http://wgbis.ces.iisc.ernet.in/grass/gdp/html_grass64/v.kcv.html). This > function randomly partition points into test/train sets. > > > > On 11/19/2012 12:40 PM, Olav Peeters wrote: > > Hi everyone, > for the purpose of speeding up a complex interpolation (written in single > core Fortran-code) we would want to split a cloud of points (ca. 3 million > irregular points) into X number of parts (eg 20 parts of more or less 150 > 000 points). Does anyone know of some QGIS-extension that could do this kind > of a job? > > I was looking at a Saga-gis module ("Shapes - Tools > Split Shapes Layer > Randomly") in the SEXTANTE toolbox. This is perfect if you want to split > shapes into two parts with varying proportions between the two parts. I can > perform this sequentially to arrive at the desired number of parts, but is > very time consuming if you want to compare the impact on the system of > splitting everything in eg 20 parts versus 15 or 12 or.. > > Preferably, a solution should be executable from the command-line. > > Cheers, > Olav > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
