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

[Johanna Botman]

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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