LEGEND

A classification system in a particular area using a defined mapping scale and a particular data set which may contain all or a sub-set, of possible classes. A legend depends: (a) on scale and cartographic representation e.g. occurrence of mixed classes; and (b) on data and mapping methodology. As a consequence, different legends which do not have a common reference classification system cannot be compared and correlated. Modified from: Choudhury and Jansen (1997)