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sp (version 0.7-6)

bubble: 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(2,3), key.entries = quantile(data[,zcol]), main, 
	identify = FALSE, labels = row.names(data.frame(obj)), key.space = "right")

Arguments

obj
object of, or extending, class SpatialPointsDataFrame or SpatialGridDataFrame, see coordinates or SpatialPointsDataFrame; the object knows about its spatial coord
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.
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

Value

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

See Also

xyplot, mapasp, identify

Examples

Run this code
data(meuse)
coordinates(meuse) <- c("x", "y") # promote to SpatialDataFrame
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))

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