(40–100) for G, R and NIR, respectively. NIR had the
highest contrast and was brighter. In NIR, vegetation
is brighter than in R and G and more difficult to
distinguish from dirt roads compared to the other two
channels. R was best to distinguish texture in vegetation.
Buildings were similar in all channels, with
shadows being slightly darker and more pronounced
in NIR. Further preprocessing could be applied, e.g. to
reduce noise and enhance contrast, but it was decided
to apply such procedures directly to the orthophotos.