This function produces a map with geographic regions defined by polygons. It is essentially the same function as
polys.plot() in mgcv but with added arguments zlim and rev.col and a wider set of choices for
scheme.
polys.map(lm, z, scheme = "gray", lab = "", zlim, rev.col = TRUE, ...)Named list of matrices where each matrix has two columns. The matrix rows each define the vertex of a boundary polygon.
A vector of values associated with each area (item) of lm.
Possible values are "heat", "terrain", "topo", "cm" and "gray", indicating how to fill
the polygons in accordance with the value of z.
label for plot.
If missing then the range of z will be chosen using pretty(z) otherwise the range provided will be used.
If FALSE then coloring scheme is not reversed.
other arguments to pass to plot.
It produces a plot.
See help file of polys.plot in mgcv.