[Qgis-user] Counting instances of points and representing totals

[Randal Hale]

If every Accident has an ID for location you can use the group stats 
plugin to summarize the # of wrecks in each location. You could then 
save that out to a text file and join it to a point layer and get the 
graduated symbol you are after.

If not - I'm thinking you set a very small buffer in each location and 
then use the  Points in Polygon tool under vector -> analysis (I think).

Good Luck, We're all counting on you!

Randy



On 09/29/2015 09:38 PM, Johanna Botman wrote:
>
> Hi,
>
> I'm having trouble working out what should be a simple problem.
>
> I have data that lists all the traffic accidents in our local area. 
> Each accident has a unique ID, but there can be many accidents at the 
> one location.
>
> I want to show the accumulated accident numbers using a graduated 
> symbol size based on the count of accidents at that one spot. 
>  Underdark's excellent blog post describes how to use the new features 
> in QGIS 2.10 - using a range from a single attribute. What I want QGIS 
> to do is to add up the incidents for a specific location.
>
> My brain hurts and I can't think how to do this. Can someone help?
>
> _______________
> Johanna Botman
> GIS / Assets Officer
>
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-- 
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
twitter:rjhale     http://about.me/rjhale
http://www.northrivergeographic.com/introduction-to-quantum-gis
Southeast OSGEO: http://wiki.osgeo.org/wiki/Southeast_US

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