Would it be an option for you to rasterize the polygons and then sample
the raster? That's always much faster.
Best wishes,
Anita
Am 10.01.2014, 21:39 Uhr, schrieb Michael.Dodd <[email protected]>:
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 [[email protected]]
Sent: Friday, January 10, 2014 7:44 PM
To: [email protected]; 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 <[email protected]>:
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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