SpatialPoints-class function

Class "SpatialPoints"

Class for (irregularly spaced) points class

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

See Also

SpatialPointsDataFrame-class

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)