[R] Resampling a grid to coarsen its resolution

Steve Murray smurray444 at hotmail.com
Tue Feb 9 17:20:18 CET 2010

Dear all,

I have a grid (data frame) dataset at 0.5 x 0.5 degrees spatial resolution (720 columns x 360 rows; regular spacing) and wish to coarsen this to a resolution of 2.5 x 2.5 degrees. A simple calculation which takes the mean of a block of points to form the regridded values would do the trick. Values which should be excluded from the calculation are -9999 (unless all points within a block are -9999, in which case -9999 should be returned as the 'new' cell).

How would I go about achieving this in R?

Any help or guidelines would be very much appreciated.

Many thanks,


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