[Qgis-user] aggregate points within pre-defined grid squares

[sw1234]

QGIS has the option Vector / Data management tools / Join attributes by 
location. Select your grid layer as 'Target vector layer' and your point 
layer as 'Join vector layer'.

Op 19-8-2012 2:43, PB schreef:
> Hi - I have a large set of points (x,y,z) on a map. Overlayed on the map is a
> grid that is currently a separate polygon shapefile layer (defined by
> lat/lons).  What i'd like to do is aggregate the z values within each grid
> square (sum, mean, count, etc).  I'm new-ish to GIS, and brand new to QGIS,
> have searched the archive, and tried a number of vector tools and queries
> but no joy.  I have also tried converting layers to rasters, but things
> start getting weird quickly.
>
> Any help would be great.  Many thanks!  Paul.
>
>
>
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