sp: coordinates – R documentation

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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")`) 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.
`...`	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)

sp

Classes and Methods for Spatial Data

v1.4-5

GPL (>= 2)

Authors

Edzer Pebesma [aut, cre], Roger Bivand [aut], Barry Rowlingson [ctb], Virgilio Gomez-Rubio [ctb], Robert Hijmans [ctb], Michael Sumner [ctb], Don MacQueen [ctb], Jim Lemon [ctb], Finn Lindgren [ctb], Josh O'Brien [ctb], Joseph O'Rourke [ctb]

Initial release