[Qgis-user] split point cloud into X randomly selected (equally sized) parts

[Paulo van Breugel]

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
>
>
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