| coordinates {sp} | R Documentation |
sets spatial coordinates to create spatial data, or retrieves spatial coordinates
coordinates(obj)
coordinates(object) <- value
obj |
object deriving from class "Spatial" |
object |
object of class "data.frame" |
value |
spatial coordinates; either a matrix, list, or data
frame with numeric data, or column names, column number or a
reference: a formula (in the form of e.g. ~x+y), column numbers
(e.g. c(1,2)) or column names (e.g. c("x","y")) specifying
which columns in object are the spatial coordinates. If the coordinates
are part of object, giving the reference does not duplicate them, giving
their value does duplicate them in the resulting structure.
|
usually an object of class SpatialPointsDataFrame; if the coordinates set cover the full set of variables in object, an object of class SpatialPoints is returned
# data.frame
data(meuse.grid)
coordinates(meuse.grid) <- ~x+y
gridded(meuse.grid) <- TRUE
class(meuse.grid)
bbox(meuse.grid)
data(meuse)
meuse.xy = meuse[c("x", "y")]
coordinates(meuse.xy) <- ~x+y
class(meuse.xy)