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

[PB]

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.



--
View this message in context: http://osgeo-org.1560.n6.nabble.com/aggregate-points-within-pre-defined-grid-squares-tp4996130.html
Sent from the Quantum GIS - User mailing list archive at Nabble.com.