r - adding land boundary to a filled.contour plot -


i'd add boundary lines scotland filledcontour plot have of raster file. code looks like:

filledcontour(neap_hu3, levels=seq(-1,8,0.25), col=rgb.palette(36), plot.title = title(xlab="longitude", ylab="latitude"), plot.axes={ axis(1); axis(2); contour(neap_hu3, add=t )} )

where neap_hu3 raster file.

i've tried adding map(add=true) didn't work. tried plotting shapefile of boundary after filledcontour plot didn't work.

anyone has suggestions? appreciated :)


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