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The histogram for the green colour band also displayed a proportion of spectral
values which was consistent with an area of bog. It should be noted that the values
are very similar to the benchmark values identified in the sampling section, but are
from a real world polygon –the sampling section used sections of the land type
from within known areas to set the benchmark. This part of the study is looking at
typical polygons extracted using vector data. It is therefore significant that the
results are so similar:
Figure 68: Green colour band for bog test 2
As with the first sample, all three colour bands matched the expected range, with
the blue colour band peaking for a range consistent with bog. This makes the
proportional method (comparing the values to their proportional range to known
areas such as water bodies and roads) possible, and suggests that during the
second step of the algorithm the areas flagged as bog could be included into a
known set of values to test areas with high standard deviation and multiple peaks
of values against;
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