EuroSDR Projects - Host Ireland

different villages were identified as well as large parts of the road network. The riverbed on the top left corner was
classified as bright object due to the high reflectance of the bare stones. In the alpine scene (see Figure 4-15c) bare
rock is classified as bright object as well. Shadows are very prominent in the image and some small patches were
classified as fields.
Comparison was carried out based on an evaluation matrix developed for the classes present in the classification as
well as in the reference data (see Table 4-8). The results for the urban scene (see Figure 4-16a) show that large parts
of the city have been assigned to plausible (yellow) showing parts of the city structure. This is due to generalisation
employed in the land use data base and, according to the evaluation matrix, urban areas in the land use data are
assigned to plausible if they have been classified as forest or meadow. The river, which has been misclassified, was
assigned to questionable (blue) as were some roads in the data base which could not be identified due to tree cover.
Some building activities, which have taken place in the study area, are highlighted in red.
Land use
134
Classification
Forest Meadow Field Red
roof
Bright
object
Grey
object
Other
urban
object
Water
River
Gravel
Orchard
Lake
Urban
Wetlands
Other
Forest
Rock
Shrub
Road
identical plausible questionable new
Table 4-8: Evaluation matrix for data from Switzerland