projection function

Get or set a coordinate reference system (projection)

Get or set the coordinate reference system (CRS) of a Raster* object.

## S4 method for signature 'ANY'
crs(x, asText=FALSE, ...)
## S4 method for signature 'Raster'
wkt(obj)
crs(x, ...) <- value

projection(x, asText=TRUE)
projection(x) <- value

Arguments

• x: Raster* or Spatial object
• obj: Raster*, Spatial, or CRS object
• asText: logical. If TRUE, the projection is returned as text. Otherwise a CRS-class object is returned
• ...: additional arguments. None implemented
• value: CRS object or a character string describing a projection and datum in the PROJ.4 format

Returns

Raster*, Spatial*, or character object

Note

crs replaces earlier function projection. For compatibility with sp you can use proj4string instead of crs. wkt returns the "well-known-text" representation of the crs.

See Also

projectRaster, spTransform

Details

projections are done by with the PROJ library

Examples

r <- raster()
crs(r)
crs(r) <- "+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100 +datum=WGS84"
crs(r)
w <- wkt(r)
w
cat(w, "\n")