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from which any variance would flag a problem with the polygon analysis and flag
it for further analysis (step 4 in the algorithm):
Figure 53: Blue colour band for marsh test 2
The third known marsh polygon used to test the expected values was taken from
an area east of the image, with a high degree of shade and trees (and as a
consequence overhanging growth making aerial analysis difficult). This was used
to see if a relatively small area of marsh (in comparison to the other areas used in
this section in of the study) could return values close to what an automatic
analysis would expect, even with some distortion from neighbouring features):
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