coarsening a grid

Thanks to both!  Even for plotting a large grid, these are good
options for speeding that up where the full resolution isn't needed...
-----Original Message-----
From: r-sig-geo-bounces at r-project.org [mailto:r-sig-geo-bounces at r-
project.org] On Behalf Of Roger Bivand
Sent: Tuesday, May 24, 2011 2:03 PM
To: Nick Matzke
Cc: r-sig-geo at stat.math.ethz.ch
Subject: Re: [R-sig-Geo] coarsening a grid

On Tue, 24 May 2011, Nick Matzke wrote:

Hi all,

Maybe this is obvious but I can't seem to find anything on it.

I have loaded and displayed a small DEM grid (6 MB) with readGDAL.

Is there an easy way to coarsen it or downsample it?
aggregate() in raster is useful/fast as well.

You can downsample it when reading in, see the output.dim= argument to
readGDAL() and its use in the examples there.

Roger

Cheers!
Nick

--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School
of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no

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coarsening a grid

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