On 19-02-15 19:54, Chris Berens wrote: > Hi all, > > The random points I generate inside polygons with QGIS always seem to > follow lines. This is also evident on the Linfiniti manual example of > same: > http://manual.linfiniti.com/en/vector_analysis/spatial_statistics.html > Is there a reason for this?
Hi Chris, I do not see 'lines', but I do see some 'flocking'... It all depends on the algorithm used: https://github.com/qgis/QGIS/blob/master/python/plugins/fTools/tools/doRandPoints.py#L154-L170 not sure if you can deduct what is the 'problem' there. For a plugin I created for a client: Feature Grid Plugin (to create a regular grid of points in a polygon for small work plots), I had a look into some algorithms to create a given number of points in a polygon which are random but also fill up the space at best. The best algorithm to use (and is very nice to look at) comes from http://bost.ocks.org/mike/algorithms/ <== look at those !!! and is called 'Poisson-disc: http://www.jasondavies.com/poisson-disc/ If people are interested I think it is nice to either add this to ftools or to my own plugin. Regards, Richard _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
