I've asked this in the general R list, but it may be better here.

have used smooth.ppp in spatstat to create a smoothed surface plot  
based on randomly selected depth measurements across a lake (as marks  
in spatstat).

I wonder, if based on the smoothed surface plot, if I can calculate  
the average depth for each 10x10 grid square across the lake.

I can't see any obvious way of doing this and would appreciate some  
pointers.

Many thanks,

Graham





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