Hi Giacomo.

You can access gdal_grid from qgis. (Raster menu).  Use the moving average 
algorithm. 
 If it's not there, you may need to modify the gdal command line by pressing 
the yellow pencil.

http://www.gdal.org/gdal_grid.html#gdal_grid_algorithms_average

Nicolas

> Le 10 nov. 2016 à 17:48, Giacomo Fontanelli-2 [via OSGeo.org] 
> <ml-node+s1560n5295232...@n6.nabble.com> a écrit :
> 
> 
> down vote
> favorite
> I have a vector layer with points located on a regular square grid of 2Km. 
> The layer has a column with a numeric value (crop yield) for each point.
> 
> I would like to resample the vector to a grid of 1Km, and the new points 
> should have the crop yield value represented by the average of the 4 points 
> surrounding.
> 
> I would like o use QGis.
> 
> Thank you for your suggestions
> 
> 
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