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whole was not analyzed but individual sections representative of a specific land<br />
cover type were selected).<br />
The third sampling area was a section of bog, which was chosen because it is<br />
often found close to coniferous forestry in the Irish landscape. The ability to use<br />
coniferous as a reference when analyzing the image for the presence of bog means<br />
for most studies there will be an adjacent source of analysis to base the search key<br />
on. The mean pixel value for the red colour band was similar to the mean pixel<br />
value for the red colour band in pasture but the green value was notably different<br />
(to the green colour band in pasture). The green colour band value for bog was<br />
just under 20% larger than the value found in the coniferous samples; indicating<br />
that a 40% increase in the red colour band and a 20% increase in the green colour<br />
band mean values, coupled with a 50% reduction in the standard deviation for<br />
areas close to the known coniferous figures has a high probability of being an area<br />
of bog. Once this variation is cross checked with other known values in the area<br />
(water, road and buildings/ roofs), and cross checked with the secondary derived<br />
values identified in the algorithm (pasture etc.) areas of bog can be automatically<br />
quantified.<br />
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