[Qgis-user] Counting the sum of points in a polygon

[Andreas Neumann]

Hi Steve,

Actually you may be able to do what you want by the "Join by location"
plugin which can do group summaries. See Vector --> Data Management -->
Join attributes by location.

Another route would be the "Spatial Query plugin" which lets you select
points inside a given polygon. With that selection you can assign the
polygon value to the points and then use the "Group stats" plugin.
However, this is a lot of manual work assigning the polygon information
to the points.

Andreas


Am 27.11.2013 16:14, schrieb Andreas Neumann:
> Hi Steve,
> 
> Oops - I was wrong. The "Zonal Statistics" plugin only works between a
> vector and a raster layer and aggregates (sum/mean/max) the raster cell
> values intersected with a polygon vector layer.
> 
> This is different from your needs.
> 
> For point in polygon there is a "Point in Polygon" function which at
> least counts the points aggregated by polygon. Output is a shapefile.
> 
> Does that suit your needs or do you need more than just the count?
> Sorry, no sum/min/max/mean - just simple counts.
> 
> If you have your data in Postgis, it would be very easy to do aggregates
> based on the polygon geometry. I could provide a SQL query if you are
> interested.
> 
> Andreas
> 
> Am 27.11.2013 15:57, schrieb Steven Campbell:
>> Hi Andreas
>>
>> Is this the same as the basic statistics tool that you can find in the Vector tools? I can see the plugin is already loaded but cannot see any Zonal Stats button/option anywhere. I'm using the latest weekly build at the minute.
>>
>> Thanks
>>
>> Steve
>>
>>
>>
>>
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