Why no legend appears with the a raster map?

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0

I simply download a map from here http://ift.tt/1IrWgM4. this map is a tiff file.

  mapd <- raster("C:\\MCD12C1_T1_2011-01-01_rgb_1440x720.TIFF")
  plot(mapd)

you can see there is no legend at all, any help

asked 1 min ago

Barry

144

Why no legend appears with the a raster map?