sp: SpatialPoints-class – R documentation

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SpatialPoints-class

Class "SpatialPoints"

Description

Class for (irregularly spaced) points

Objects from the Class

Objects can be created by calls of the form SpatialPoints(x).

Slots

coords:: Object of class "matrix", containing the coordinates (each row is a point)
bbox:: Object of class "matrix", with bounding box
proj4string:: Object of class "CRS", projection string

Extends

Class "Spatial", directly.

Methods

[: signature(x = "SpatialPoints"): subsets the points; only rows (points) can be subsetted
coerce: signature(from = "SpatialPoints", to = "data.frame"): retrieves the data part
coerce: signature(from = "SpatialPoints", to = "SpatialPixels"): equivalent to assigning gridded TRUE for a copy of the object
coerce: signature(from = "SpatialPointsDataFrame", to = "SpatialPixelsDataFrame"): equivalent to assigning gridded TRUE for a copy of the object
coerce: signature(from = "data.frame", to = "SpatialPoints"): sets coordinates, which may be in a data frame
coerce: signature(from = "matrix", to = "SpatialPoints"): set coordinates, which may be in a matrix
coordinates: signature(obj = "SpatialPoints"): retrieves the coordinates, as matrix
plot: signature(x = "SpatialPoints", y = "missing"): plot points
summary: signature(object = "SpatialPoints"): summarize object
points: signature(x = "SpatialPoints"): add point symbols to plot
show: signature(object = "SpatialPoints"): prints coordinates
rbind: signature(object = "SpatialPoints"): rbind-like method

plot method arguments

The plot method for “SpatialPoints” objects takes the following arguments:

x: object of class SpatialPoints
pch: default 3; either an integer specifying a symbol or a single character to be used as the default in plotting points
axes: default FALSE; a logical value indicating whether both axes should be drawn
add: default FALSE; add to existing plot
xlim: default NULL; the x limits (x1, x2) of the plot
ylim: default NULL; the y limits of the plot
...: passed through
setParUsrBB: default FALSE; set the par “usr” bounding box, see note in Spatial-class
cex: default 1; numerical value giving the amount by which plotting text and symbols should be magnified relative to the default
col: default 1; default plotting color
lwd: default 1; line width
bg: default 1; colour to be used for the background of the device region

Author(s)

Edzer Pebesma, edzer.pebesma@uni-muenster.de

Examples

x = c(1,2,3,4,5)
y = c(3,2,5,1,4)
S <- SpatialPoints(cbind(x,y))
S <- SpatialPoints(list(x,y))
S <- SpatialPoints(data.frame(x,y))
S
plot(S)

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