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for the clue colour band, as with the previous three test polygons, remained
consistent with an expected range for marsh (see sampling section):
Figure 59: Blue colour band for marsh test 4
The values returned for the test of marsh polygons were not as distinct as the
previous three polygon tests (pasture, rough pasture and bog). There were sets of
values (such as a consistent blue range and gradual increase in count from shade
to the expected marsh range) which can be used to classify this type of area, but
the classification needs to be confined to the latter (step 3) part of an automatic
search algorithm to increase the probability of the spectral values matching
correctly.
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