EuroSDR Projects - Host Ireland

4.1.4 Change map
As the results of the classification can normally not be directly compared to the reference data (here the DCM) an
evaluation matrix was created (see Table 4-4). Each possible class combination that may occur has been assigned to
one of four plausibility classes (identical in green, plausible in yellow, questionable in blue and new in red).
Applying this matrix to the classification and reference data shows where changes might have taken place and give
some indication as to their nature (see Figure 4-9).
DCM
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Classification
Forest Meadow Field Red roof Bright
object
Grey
object
Other urban
object
Agriculture
Building
Building plot not sealed
Building plot sealed
Extensively used pasture
Fallow land
Field
Forest
Market Garden
Meadow
Orchard
Other
Pasture
Railway
Recreational Area
Road
Water running
Water stagnant
Vineyards
identical plausible questionable new
Table 4-4: Evaluation matrix for comparing the classification for Austria with the DCM
It can be seen from the comparison that most areas were considered identical (green). Plausible (yellow) are
especially areas that are fields in the DCM but, due to the vegetation cycle, were classified as meadow. Blue
(questionable) appears especially along the borders of forests, where either shadows were classified as forest or the
forest has increased compared to the reference data. In addition, houses present in the DCM but not present in the
image are also classified as questionable.