Spatial-class

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Class "Spatial"

An abstract class from which useful spatial classes are derived

Keywords
classes
Usage
Spatial(bbox, proj4string = CRS(as.character(NA))) "subset"(x, subset, select, drop = FALSE, ...)
Arguments
bbox
a bounding box matrix
proj4string
a CRS object
x
object of class Spatial
subset
see subset.data.frame
select
see subset.data.frame
drop
see subset.data.frame
...
passed through
Note

The default aspect for map plots is 1; if however data are not projected (coordinates are longlat), the aspect is by default set to 1/cos(My * pi)/180) with My the y coordinate of the middle of the map (the mean of ylim, which defaults to the y range of bounding box).

The argument setParUsrBB may be used to pass the logical value TRUE to functions within plot.Spatial. When set to TRUE, par(“usr”) will be overwritten with c(xlim, ylim), which defaults to the bounding box of the spatial object. This is only needed in the particular context of graphic output to a specified device with given width and height, to be matched to the spatial object, when using par(“xaxs”) and par(“yaxs”) in addition to par(mar=c(0,0,0,0)).

Objects from the Class

are never to be generated; only derived classes can be meaningful

Slots

bbox:
Object of class "matrix"; 2-column matrix holding the minimum in first and maximum in second column for the x-coordinate (first row), y-coordinate (second row) and optionally, for points and grids only, further coordinates. The constructed Spatial object will be invalid if any bbox values are NA or infinite. The column names must be c("min", "max")
proj4string:
Object of class "CRS"; holding a valid proj4 string, which can be used for unprojecting or reprojecting coordinates; it is initialised to NA. Other strings are checked for validity in the rgdal package, but attempts to assign a string containing "longlat" to data extending beyond longitude [-180, 360] or lattitude [-90, 90] will be stopped or warned, use set_ll_warn to warn rather than stop, and set_ll_TOL to change the default tolerance for the range exceedance tests.

Methods

bbox
signature(obj = "Spatial"): retrieves the bbox element
dimensions
signature(obj = "Spatial"): retrieves the number of spatial dimensions spanned
gridded
signature(obj = "Spatial"): logical, tells whether the data is on a regular spatial grid
plot
signature(x = "Spatial", y = "missing"): plot method for spatial objects; does nothing but setting up a plotting region choosing a suitable aspect if not given(see below), colouring the plot background using either a bg= argument or par("bg"), and possibly drawing axes.
summary
signature(object = "Spatial"): summarize object
$
retrieves attribute column
$<-
sets or replaces attribute column, or promote a geometry-only object to an object having an attribute

plot method arguments

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

x
object of class Spatial
xlim
default NULL; the x limits (x1, x2) of the plot
ylim
default NULL; the y limits of the plot
asp
default NA; the y/x aspect ratio
axes
default FALSE; a logical value indicating whether both axes should be drawn
bg
default par("bg"); colour to be used for the background of the device region
xaxs
The style of axis interval calculation to be used for the x-axis
yaxs
The style of axis interval calculation to be used for the y-axis
lab
A numerical vector of the form c(x, y, len) which modifies the default way that axes are annotated
setParUsrBB
default FALSE; set the par “usr” bounding box; see below
bgMap
object of class ggmap, or returned by function RgoogleMaps::GetMap
expandBB
numeric; factor to expand the plotting region default: bbox(x) with on each side (1=below, 2=left, 3=above and 4=right); defaults to c(0,0,0,0); setting xlim or ylim overrides this.
...
passed through

Warning

this class is not useful in itself, but all spatial classes in this package derive from it

See Also

SpatialPoints-class, SpatialGrid-class,

SpatialPointsDataFrame-class, SpatialGridDataFrame-class

Aliases
  • Spatial-class
  • Spatial
  • print.summary.Spatial
  • subset.Spatial
  • cbind.Spatial
  • head.Spatial
  • tail.Spatial
  • summary,Spatial-method
  • plot,Spatial,missing-method
  • getParUsrBB
  • setParUsrBB
  • coordinates<-,Spatial-method
  • [[<-,Spatial,ANY,missing-method
  • [<-,Spatial-method
  • [[,Spatial,ANY,missing-method
  • $<-,Spatial-method
  • $,Spatial-method
  • im-class
  • owin-class
  • ppp-class
  • psp-class
Documentation reproduced from package sp, version 1.2-3, License: GPL (>= 2)

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