[R-sig-Geo] RGDAl & Map Algebra or Cartographic Modelling

[Roger Bivand]

> Hi.
>
>  Against images imported by RGDAL, can R execute　Tomlin's Map Algebra
> or
> Cartographic
> Modelling(http://mutate.echiron.com/doc_center/library/pcraster/x30.htm)?

Cell by cell operations would work, because then you don't need to know
where you are. Any other operations do need to know, and wouldn't work
without functions being written. Maybe these are best handled in GIS - you
refer to PCRaster, which is downloadable, although closed source, for
Windows. GRASS is a cross-platform alternative, and its r.mapcalc gets you
a long way - my choice would be to write a wrapper to convert the image to
the structure needed to output to a GRASS raster, and do the work there.
Perhaps it would help to be able to create a new GRASS LOCATION from
within R running within GRASS?

Roger

>
>  Regards.
>
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-- 
Roger Bivand
NHH, Breiviksveien 40, N-5045 Bergen, Norway