bubble: Create a bubble plot of spatial data

In sp: Classes and Methods for Spatial Data

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

See Also

xyplot, mapasp, identify

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))

sp documentation built on May 29, 2024, 5:33 a.m.