[R-sig-Geo] projection() and proj4string()

[Agustin Lobo]

So, if I correctly understand, projection() can be used to retrieve
information
from an sp object but not to assign that info to a sp object:
> projection(a)
[1] "+proj=utm +zone=31 +ellps=intl +units=m +no_defs"

> projection(a) <- projection(a)
Error in checkSlotAssignment(object, name, value) : 
  "crs" is not a slot in class "SpatialPoints"
Calls: projection<- -> @<- -> slot<- -> checkSlotAssignment


Roger Bivand wrote:
> 
> .../...
> Probably projection<-() needs the same if() statement as that used in 
> projection(), to distinguish extensions of "BasicRaster" from those of 
> "Spatial", in which case projection<-() and proj4string<-() will both work 
> on objects extending "Spatial" too.
> 
> Roger
> 

>From a user point of view, this would be certainly useful.

Thanks!

Agus
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