The For example, Plate 32 illustrates the effects of
combining three of the factors with trade-off and
one without. In this case, proximity to roads is given
a criterion weight of 0.45, proximity to the labour
force is given a weight of 0.12, and the slope factor
is given a weight of 0.43. These are combined using
a standard weighted linear combination. This result
is then combined with the distance from wildlife
reserve factor using a minimum operator. The
absence of trade-off in this last step is clear – the
distance from wildlife reserve factor dominates the
result until it no longer represents the limiting
factor. The effect is clearly similar to that of a
constraint, but lacks the crispness of a traditional
constraint. In effect, the minimum operator with a
fuzzy measure represents a form of soft constraint.
Soft constraints are particularly useful where a
specific boundary cannot be reasonably established.
Indeed, it might be argued that this is more
commonly appropriate than the artificial boundaries
of traditional constraints.
The For example, Plate 32 illustrates the effects ofcombining three of the factors with trade-off andone without. In this case, proximity to roads is givena criterion weight of 0.45, proximity to the labourforce is given a weight of 0.12, and the slope factoris given a weight of 0.43. These are combined usinga standard weighted linear combination. This resultis then combined with the distance from wildlifereserve factor using a minimum operator. Theabsence of trade-off in this last step is clear – thedistance from wildlife reserve factor dominates theresult until it no longer represents the limitingfactor. The effect is clearly similar to that of aconstraint, but lacks the crispness of a traditionalconstraint. In effect, the minimum operator with afuzzy measure represents a form of soft constraint.Soft constraints are particularly useful where aspecific boundary cannot be reasonably established.Indeed, it might be argued that this is morecommonly appropriate than the artificial boundariesof traditional constraints.
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