sp (version 1.2-1)

coordinates: set spatial coordinates to create a Spatial object, or retrieve spatial coordinates from a Spatial object

Description

set spatial coordinates to create a Spatial object, or retrieve spatial coordinates from a Spatial object

Usage

coordinates(obj, ...)
	coordinates(object) <- value

Arguments

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")

...

additional arguments that may be used by particular methods

Value

• 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

Examples

# 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)