How to draw grid contours within a map
In order to illustrate the spatial domain of the General Circulation Model
(GCM) output data I am using, I
need to display some grids within a map. They need to be 2.5?x2.5? lat-lon over specific coordinates.
Following, I create the "empty" grids to draw:
library(raster) rprecip<-raster(xmn=-60,xmx=-50,ymn=-35,ymx=-25) res(rprecip)<-2.5
Thiago, You can do this rprecip[] <- 1 # (set cells you do not want to NA) p <- rasterToPolygons(res) plot(p) Robert
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