spplot

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Plot methods for spatial data with attributes

Lattice (trellis) plot methods for spatial data with attributes

Keywords
dplot
Usage
spplot(obj, ...)
spplot.grid(obj, zcol = names(obj), ..., names.attr, 
	scales = list(draw = FALSE), xlab = NULL, ylab = NULL, aspect = mapasp(obj,xlim,ylim), 
	panel = panel.gridplot, sp.layout = NULL, formula, xlim = bbox(obj)[1, ], 
	ylim = bbox(obj)[2, ], checkEmptyRC = TRUE)
spplot.polygons(obj, zcol = names(obj), ..., names.attr, 
	scales = list(draw = FALSE), xlab = NULL, ylab = NULL, aspect = mapasp(obj,xlim,ylim), 
	panel = panel.polygonsplot, sp.layout = NULL, formula, xlim = bbox(obj)[1, ], 
	ylim = bbox(obj)[2, ])
spplot.points(obj, zcol = names(obj), ..., names.attr, 
	scales = list(draw = FALSE), xlab = NULL, ylab = NULL, aspect = mapasp(obj,xlim,ylim), 
	panel = panel.pointsplot, sp.layout = NULL, identify = FALSE, formula, 
	xlim = bbexpand(bbox(obj)[1, ], 0.04), ylim = bbexpand(bbox(obj)[2, ], 0.04))
mapLegendGrob(obj, widths = unit(1, "cm"), heights = unit(1, "cm"),
	fill = "black", just = "right")
sp.theme(set = FALSE, regions = list(col = bpy.colors(100)), ...)
layout.north.arrow(type = 1)
layout.scale.bar(height = 0.05)
spplot.locator(n = 512, type = "n", ...)
Arguments
obj
object of class extending Spatial-class
zcol
character; attribute name(s) or column number(s) in attribute table
names.attr
names to use in panel, if different from zcol names
scales
scales argument to be passed to Lattice plots; use list(draw = TRUE) to draw axes scales; see xyplot for full options
...
other arguments passed to levelplot (grids, polygons) or xyplot (points)
xlab
label for x-axis
ylab
label for y-axis
aspect
aspect ratio for spatial axes; defaults to "iso" (one unit on the x-axis equals one unit on the y-axis) but may be set to more suitable values if the data are e.g. if coordinates are latitude/longitude
panel
depending on the class of obj, panel.polygonsplot (for polygons or lines), panel.gridplot (grids) or panel.pointsplot (p
sp.layout
NULL or list; see notes below
identify
if not FALSE, identify plotted objects (currently only working for points plots). Labels for identification are the row.names of the attribute table row.names(as.data.frame(obj)). If TRUE, identify on panel (1,1); for identifying
formula
optional; may be useful to plot a transformed value. Defaults to z~x+y for single and z~x+y|name for multiple attributes; use e.g. exp(x)~x+y|name to plot the exponent of the z-variable
xlim
numeric; x-axis limits
ylim
numeric; y-axis limits
widths
width of grob
heights
heights of grob
fill
fill color of grob
just
grob placement justification
set
logical; if TRUE, trellis.par.set is called, else a list is returned that can be passed to trellis.par.set()
regions
color ramp for the theme
height
height of scale bar; width is 1.0
n
see locator
type
see locator
checkEmptyRC
logical; if TRUE, a check is done to see if empty rows or columns are present, and need to be taken care of. Setting to FALSE may improve speed.
Value

  • spplot returns a lattice plot of class "trellis", if you fail to "see" it, explicitly call print(spplot(...)). If identify is TRUE, the plot is plotted and the return value is a vector with row names of the selected points.

    spplot.locator returns a matrix with identified point locations; use trellis.focus first to focus on a given panel.

Note

Missing values in the attributes are (currently) not allowed.

spplot.grid, spplot.polygons and spplot.points are S4 methods for spplot; see spplot-methods.

Useful arguments that can be passed as ... are: [object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

for useful values see the appropriate documentation of xyplot and levelplot.

If obj is of SpatialPointsDataFrame, the following options are useful to pass: [object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

layout.north.arrow and layout.scale.bar can be used to set a north arrow or scale bar.

The sp.layout argument is either a single layout item, or a list with one or more layout items. A layout item is a list with its first argument the name of the layout function to be called: sp.points for SpatialPoints, sp.polygons for SpatialPolygons object, sp.lines for a SpatialLines object, and sp.text for text to place. The second argument contains the object (or text) to be plotted; remaining arguments are passed to the corresponding panel.* functions.

The order of items in sp.layout matters; objects are drawn in the order they appear. Plot order and prevalence of sp.layout items: for points and lines, sp.layout items are drawn before the points (to allow for grids and polygons); for grids and polygons sp.layout is drawn afterwards (so the item will not be overdrawn by the grid and/or polygon). Transparency may further help when combining things.

Items of the sp.layout list, or its elements, can be: [object Object],[object Object]

sp.theme returns a lattice theme; use, after loading package lattice, the command trellis.par.set(sp.theme()) after a device is opened or changed to make this work. Currently, this only sets the colors to bpy.colors.

If the attributes to be plotted are of type factor, spplot tries to create a legend that reflects this. In this case, the color ramp passed needs to be of the same length as the number of factor levels. The factor levels are derived from the first map; subsequent factors with different factor levels result in an error.

References

http://r-spatial.sourceforge.net/

See Also

xyplot, levelplot, panel.identify to identify objects

Aliases
  • spplot
  • spplot.grid
  • spplot.locator
  • spplot.polygons
  • spplot.points
  • layout.north.arrow
  • layout.scale.bar
  • mapLegendGrob
  • sp.theme
  • spplot-methods
  • spplot,SpatialPixelsDataFrame-method
  • spplot,SpatialGridDataFrame-method
  • spplot,SpatialPolygonsDataFrame-method
  • spplot,SpatialLinesDataFrame-method
  • spplot,SpatialPointsDataFrame-method
Examples
library(lattice)
trellis.par.set(sp.theme()) # sets bpy.colors() ramp
data(meuse)
coordinates(meuse) <- ~x+y
l2 = list("SpatialPolygonsRescale", layout.north.arrow(), offset = c(181300,329800), 
	scale = 400)
l3 = list("SpatialPolygonsRescale", layout.scale.bar(), offset = c(180500,329800), 
	scale = 500, fill=c("transparent","black"))
l4 = list("sp.text", c(180500,329900), "0")
l5 = list("sp.text", c(181000,329900), "500 m")

spplot(meuse, c("ffreq"), sp.layout=list(l2,l3,l4,l5), col.regions= "black", 
	pch=c(1,2,3), key.space=list(x=0.1,y=.95,corner=c(0,1)))
spplot(meuse, c("zinc", "lead"), sp.layout=list(l2,l3,l4,l5, which = 2),
	key.space=list(x=0.1,y=.95,corner=c(0,1)))
# plotting factors:
meuse$f = factor(sample(letters[6:10], 155, replace=TRUE),levels=letters[1:10])
meuse$g = factor(sample(letters[1:5], 155, replace=TRUE),levels=letters[1:10])
spplot(meuse, c("f","g"), col.regions=bpy.colors(10))

if (require(RColorBrewer)) {
	spplot(meuse, c("ffreq"), sp.layout=list(l2,l3,l4,l5),
		col.regions=brewer.pal(3, "Set1"))
}

data(meuse.grid)
gridded(meuse.grid)=~x+y
meuse.grid$g = factor(sample(letters[1:5], 3103, replace=TRUE),levels=letters[1:10])
meuse.grid$f = factor(sample(letters[6:10], 3103, replace=TRUE),levels=letters[1:10])
spplot(meuse.grid, c("f","g"))
spplot(meuse.grid, c("f","g"), col.regions=bpy.colors(10))
Documentation reproduced from package sp, version 1.0-2, License: GPL (>= 2)

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