All change detection algorithms that have been found documented in the literature by early 1995
can be grouped into 11 distinctly different categories. The first seven are most frequently used for
monitoring vegetative canopies, while the other algorithms are either less common or remain in an
experimental stage. However, the order in which the algorithms are presented does not imply any
ranking nor qualitative judgement. Moreover, because the algorithms are not necessarily independent of
the data sources for which their implementation has been documented, examples typical for forest
resources monitoring are given.