As mentioned above several materials common for building
facades had been selected: concrete, sandstone, brick, granite
and marble. Main problems occurred by scanning granite and
marble where measures could be obtained only for a distance of
5m (orthogonal scan) and incidence angles of 10gon to 70gon
.
Due to the specific structure of the surfaces wetness conditions
were analysed only for concrete, sandstone and brick. For this
purpose these samples were scanned at first in dry condition,
afterwards the sample was sprayed with water by a squirt bottle.