[R-sig-Geo] finding CRS from latitude/longitude

[Tom Gottfried]

"+proj=longlat" can not be a valid CRS, as it only specifies that your 
coordinates are not projected. Probably you want to use the WGS84 
ellipsoid and datum:
http://www.spatialreference.org/ref/epsg/4326/

HTH,
Tom

Am 06.10.2012 14:48, schrieb alemante zd:
> Dear all,
>
> I would like to sp transform my latitude/longitude vector to by first
> telling it what CRS it is. This is what I did.
>
> F1<-data.frame(x, y)
> coordinates(F1)=~x+y
> SP<-SpatialPoints(F1,proj4string=CRS("+proj=longlat"))
> pts = SpatialPixels(SpatialPoints(F1))
> gridded(F1) = TRUE
>
> but I keep on getting the message that CRS is wrong.
> Coordinate Reference System (CRS) arguments: NA
>
> Could you please advice me on how I can get it right?
>
> cheers
> minti
>
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