Good morning, what about creating a buffer with a distance of your choice and counting the points inside the buffer (count points inside polygon)? If you dissolve the buffers, you should get the sum of accidents in a range defined by you buffer distance. That could help in case your accident points have not exactly the same coordinates although beeing very close.
For visualisation you could then use either the buffer area (e.g. classified with colours) or points with the sum of accidents from centroids of the buffers (e.g. symbol sizes). What you want to do, seems to be a hotspot analysis that could be solved with CrimeStat ( Wikipedia <https://en.wikipedia.org/wiki/CrimeStat> , Official Website <http://www.icpsr.umich.edu/CrimeStat> ) ... Regards, Christine -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Counting-instances-of-points-and-representing-totals-tp5226929p5226935.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
