Plot Levels of a Variable in a Colour-Coded Map
Plot levels of a variable in a colour-coded map along with a legend.
mapvariable(y, spatial.polygon, ncut=1000, nlevels=10, lower=NULL, upper=NULL, main=NULL, xlab=NULL, ylab=NULL)
y |
variable to plot |
spatial.polygon |
an object of class SpatialPolygons (See SpatialPolygons-class) |
ncut |
number of cuts in colour levels to plot |
nlevels |
number of levels to include in legend |
lower |
lower bound of levels |
upper |
upper bound of levels |
main |
an overall title for the plot |
xlab |
a title for the x axis |
ylab |
a title for the y axis |
A map colour-coded to indicate the different levels of y
Jon Wakefield, Nicky Best, Sebastien Haneuse, and Albert Y. Kim
Bivand, R. S., Pebesma E. J., and Gomez-Rubio V. (2008) Applied Spatial Data Analysis with R. Springer Series in Statistics.
E. J. Pebesma and R. S. Bivand. (2005) Classes and methods for spatial data in R. R News, 5, 9–13.
data(scotland) map <- scotland$spatial.polygon y <- scotland$data$cases E <- scotland$data$expected SMR <- y/E mapvariable(SMR,map,main="Scotland",xlab="Eastings (km)",ylab="Northings (km)")
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