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3.3 Marsh<br />
Figure 7: Typical Marsh Area Image<br />
This study looked at areas of marshy ground. The purpose was to try and identify<br />
if sections of waterlogged surface area had unique values which could be<br />
identified in a small area polygon. The areas used for the study were captured<br />
examples adjoining a lake –they had been field revised and identified specifically<br />
as marsh within an enclosed polygon. The boundary on one side was the edge of<br />
the lake, while the boundary on the other side was the border with pasture<br />
enclosed with a notional (mapping) line. The samples (three in total) can be<br />
assumed to be typical of marsh (due to the position within the target area) but<br />
there was a small amount of variation, around 5%, between results for the<br />
different colour bands. This was as expected and the values were very close to the<br />
image average. This suggests that areas of marsh would be difficult to detect using<br />
a mean pixel/ standard deviation analysis based on area polygons alone, and<br />
additional coding data taken from the original vector mapping is required to make<br />
an accurate prediction as to the probability of marshy ground being present.<br />
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