EuroSDR Projects - Host Ireland

The classification results were compared to the DCM (see Figure 4-3 and Figure 4-4) using the plausibility matrix
shown in Table 4-4.
At this stage an evaluation of the change map can only be based on a visual comparison with the results from the
analysis of the analogue orthophotos (see Figure 4-9 and Figure 4-10). The result of the comparison based on the
real-colour data (see Figure 4-10 and Figure 4-38) is very similar to that based on the orthophotos. In the subset one
can see the same objects were identified as new, as is also the case for most of those identified as questionable.
For the visualisation of the change map based on the classification of the colour infrared data (see Figure 4-39 and
Figure 4-40) shadow is not highlighted separately but is displayed in green as is the class identical. This was done
to show more details of the relevant changes which otherwise would be obscured in the figure by the profusion of
shadow. It can be seen that despite the fewer classes used in the classification, the results of the comparison are
very similar to those of the other comparisons. Again basically the same changes were highlighted as in the other
change maps, confirming the transferability of the methodology to other sensor systems.
Figure 4-37: Change map from Ultracam real-colour data
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