R Graphical Manual

Browse All

Last data update: 2014.03.03

R: Create a bubble plot of spatial data

bubble

R Documentation

Create a bubble plot of spatial data

Description

Create a bubble plot of spatial data, with options for bicolour residual plots (xyplot wrapper)

Usage

bubble(obj, zcol = 1, ..., fill = TRUE, maxsize = 3, do.sqrt = TRUE, pch, 
	col = c("#d01c8b", "#4dac26"), key.entries = quantile(data[,zcol]), main, 
	identify = FALSE, labels = row.names(data.frame(obj)), key.space = "right",
	scales = list(draw = FALSE), xlab = NULL, ylab = NULL, panel = panel.bubble,
	sp.layout = NULL, 
	xlim = bbexpand(bbox(obj)[1,], 0.04), 
	ylim = bbexpand(bbox(obj)[2,], 0.04))

Arguments

`obj`	object of, or extending, class SpatialPointsDataFrame or SpatialGridDataFrame, see coordinates or SpatialPointsDataFrame; the object knows about its spatial coordinates
`zcol`	z-variable column name, or column number after removing spatial coordinates from x@data: 1 refers to the first non-coordinate column
`fill`	logical; if TRUE, filled circles are plotted (pch = 16), else open circles (pch = 1); the pch argument overrides this
`maxsize`	`cex` value for largest circle
`do.sqrt`	logical; if TRUE the plotting symbol area (sqrt(diameter)) is proportional to the value of the z-variable; if FALSE, the symbol size (diameter) is proportional to the z-variable
`pch`	plotting character
`col`	colours to be used; numeric vector of size two: first value is for negative values, second for positive values. Default colors: 5-class PiYG from colorbrewer.org.
`key.entries`	the values that will be plotted in the key; by default the five quantiles min, q.25, median q.75, max
`main`	main plotting title
`identify`	logical; if true, regular `plot` is called instead of `xyplot`, and followed by a call to `identify()`.
`labels`	labels argument passed to `plot` if `identify` is TRUE
`...`	arguments, passed to `xyplot`, or `plot` if identification is required.
`key.space`	location of the key
`scales`	scales argument as passed to xyplot
`xlab`	x-axis label
`ylab`	y-axis label
`panel`	panel function used
`sp.layout`	possible layout items; see spplot
`xlim`	x axis limit
`ylim`	y axis limit

Value

returns (or plots) the bubble plot; if identify is TRUE, returns the indexes (row numbers) of identified points.

Author(s)

Edzer Pebesma

Examples

data(meuse)
coordinates(meuse) <- c("x", "y") # promote to SpatialPointsDataFrame
bubble(meuse, "cadmium", maxsize = 2.5, main = "cadmium concentrations (ppm)", 
    key.entries = 2^(-1:4))
bubble(meuse, "zinc", main = "zinc concentrations (ppm)",
    key.entries =  100 * 2^(0:4))