[R-sig-Geo] raster package

Agustin Lobo alobolistas at gmail.com
Mon May 18 19:36:31 CEST 2009

I have to reclassify a large (> 8000x8000 pixels) geotif raster. I normally
would do it through grass (or saga) but would like to try the raster
package in R.
The problem is that I'm a bit confused on how to do it. My understanding
of the package
is that it provides a way to operate in the rasters by pieces, not having
to read the whole thing into memory. I've seen there's a function reclass()
but how do I actually read the raster? If I use readAll() this is going
to be as
using readGDAL() directly, so this is not the way. Do I have to use
a for() of readRows(), then reclass()? This seems a bit low-level. Is
there a way
of assigning the tif file to an R raster object and then just use
reclass() and R would
read the file by pieces as needed? That's what I would like to...


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