change detection developed has allo

change detection developed has allowed to determine and describe changes in LC between
four fundamental intervals: 1954÷1975, 1975÷1985, 1985÷1993 and 1993÷2004.
There are many methods of change detection available and each has variations
depending on the imagery type, final purpose for the change image and the type of change to
be detected. In the case-study here described, the methodology followed has been the “Postclassification comparison” [Jensen et al., 1987; Dimyati et al., 1996; Ward et al., 2000]. Such
approach allows to determine the difference between independently classified images from each
of the dates in question and it is the only method in which “from” and “to” classes can be
calculated for each changed pixel. This method offers the advantage to allow the creation and
the update of GIS databases, as class/categories are given, and quantitative values of each class
can be determined.