r - How to map numbers to colours? -

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i trying view file(unsigned character, pixel =1440 , lines=720) map. tried piece of code given bellow. first, downloaded may problem code using continuous colour scheme, though have discrete data (which classification scheme). how can map numbers colours ? please example of wanted scale shown below:

conne <- file("c:\\landcover.bin", "rb") dfr<- readbin(conne, integer(), size=1,  n=720*1440, signed=f)  y<-matrix((data=dfr), ncol=1440, nrow=720) image(y)

the raster package provides method use categorical data. read page of ratify details.

first let's create rasterlayer data:

library(raster)  dfr <- readbin('biome1440s.bin', integer(), size=1,  n=720*1440, signed=f) r <- raster(nrow=720, ncol=1440) r[] <- dfr

now define rasterlayer factor ratify. should change levels using information instead of letters:

r <- ratify(r) rat <- levels(r)[[1]] rat$soil <- letters[1:15] levels(r) <- rat

and finally, categorical rasterlayer can displayed levelplot method of rastervis package.

library(rastervis)  mypal <- c('lightblue', terrain.colors(14)) ## using par.settings levelplot(r, par.settings=rastertheme(region=mypal)) ## or col.regions levelplot(r, col.regions=mypal)

world land uses

edited: levelplot uses lattice graphics, while plot uses base graphics. cannot used (unless use gridbase package). however, can overlay additional information using +.trellis , layer functions latticeextra package. since wrld_simpl spatialpolygonsdataframe can use sp.polygons function sp package plot it.

library(maptools) ## needed wrld_simpl data(wrld_simpl) ## spatialpolygonsdataframe levelplot(r, col.regions=mypal) +     layer(sp.polygons(wrld_simpl, lwd=0.5))

wrld_simpl


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