[Qgis-user] point sampling tool is there anyway to speed it up and keep it going

[Michael.Dodd]

Thanks for the suggestion, I tried it a couple of times but after 1000-2000 points it crashed (different number of points each time I tried).  It was very quick doing this in a few seconds whereas point sampling had taken several minutes for this number, however point sampling went on for hours until it crashed with about 230,000 done of the 300,000 total points.
________________________________________
From: Anita Graser [anitagraser at gmx.at]
Sent: Friday, January 10, 2014 7:44 PM
To: qgis-user at lists.osgeo.org; Michael.Dodd
Subject: Re: [Qgis-user] point sampling tool is there anyway to speed it up and keep it going

Hi Michael,

Try the SAGA implementation (through Processing). It's much faster, as
described in
http://anitagraser.com/2013/10/02/add-polygon-attributes-to-points-vs-join-attributes-by-location/

Best wishes,
Anita


Am 10.01.2014, 19:41 Uhr, schrieb Michael.Dodd <Michael.Dodd at open.ac.uk>:

> The point sampling plugin can be very effective but is slow when dealing
> with a large number of points and a complex area to be sampled e.g.
> hundreds of thousands of points on a relatively detailed map of world
> countries.  I can cope with it being slow by just accepting it will take
> all day to run BUT it never completes because there is always something
> that happens on the pc that stops it, the last time it happened after
> about 4 hours with a couple more hours to run.  If you try to use any
> other program on the pc then the tool stops and also freezes qgis.  am
> currently running qgis 2.0.1 on windows7 64bit with quite a lot of ram
> although i note it never uses more than about 13% of the total ram.  I
> used to run the tool with earlier versions of qgis on windowsXP and had
> the same issue with it stopping if any other program was opened on the
> pc.
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