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Figure 70: Aerial view for bog test 3<br />
The results across all three colour bands were similar to the first two test samples<br />
and matched the expected values identified in the sampling section of this study,<br />
which indicates for general areas of raised bog this algorithm gives an accurate<br />
indicator of total area. This may not be the case for more remote sections of this<br />
land type, found on mountain ranges. The algorithm is dependant on closed vector<br />
polygons, which are available for almost all of the country, with the exception of<br />
high mountains. In those cases it would be necessary to re-set the image key to<br />
search for values of exposed rock and determine the proportional difference<br />
between the expected bog values and those for exposed rock in much larger<br />
mountainous polygons –this is something which the algorithm can be adapted for<br />
but is not attempted here as the focus is on matching generic land use types as<br />
much as possible (the larger mountain areas would contain a mix of marsh, bog,<br />
exposed rock and vegetation).<br />
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