projection() and proj4string()
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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