Contour plot of a RasterLayer.
# S4 method for RasterLayer
contour(x, maxpixels=100000, ...)
Raster* object
maximum number of pixels used to create the contours
any argument that can be passed to contour (graphics package)
persp, filledContour, rasterToContour
r <- raster(system.file("external/test.grd", package="raster"))
plot(r)
contour(r, add=TRUE)
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