operators. This procedure dominates MCE with
vector software systems, but is also commonly used
with raster systems. For example, Figure 1 shows
how Boolean images, along with their intersection
achieved through the characteristic overlay
operation of a GIS, may be used here to find all
areas suitable for industrial development, subject to
the following criteria: suitable areas will be near to a
road (within 1 km – upper left), near to a labour
force (within 7.5 km of a town – middle left), on low
slopes (less than 5 per cent – upper right), and
greater that 2.5 km from designated wildlife reserves
(middle right). In addition, development is not
permitted in wildlife reserves (lower left). These
criteria are aggregated by means of an intersection
(logical AND) operator, yielding the result on the
lower right. Note that the distance to labour force
was calculated from a cost distance surface that
accounted for road and off-road frictions.
In the second most common procedure for MCE,
quantitative criteria are evaluated as fully
continuous variables rather than collapsing them to
operators. This procedure dominates MCE withvector software systems, but is also commonly usedwith raster systems. For example, Figure 1 showshow Boolean images, along with their intersectionachieved through the characteristic overlayoperation of a GIS, may be used here to find allareas suitable for industrial development, subject tothe following criteria: suitable areas will be near to aroad (within 1 km – upper left), near to a labourforce (within 7.5 km of a town – middle left), on lowslopes (less than 5 per cent – upper right), andgreater that 2.5 km from designated wildlife reserves(middle right). In addition, development is notpermitted in wildlife reserves (lower left). Thesecriteria are aggregated by means of an intersection(logical AND) operator, yielding the result on thelower right. Note that the distance to labour forcewas calculated from a cost distance surface thataccounted for road and off-road frictions.In the second most common procedure for MCE,quantitative criteria are evaluated as fullycontinuous variables rather than collapsing them to
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