# SpatialPoints-class {sp}

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

### See Also

`SpatialPointsDataFrame-class`

### Examples

Documentation reproduced from package sp, version 1.2-3. License: GPL (>= 2)