bubble {sp} | 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(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 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.
`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.

### Author(s)

Edzer J. Pebesma

### References

### See Also

xyplot, mapasp, identify

### Examples

    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))

[Package sp version 0.7-12 Index]