The primary decision factors
are considered in this study as listed in section 3 (see
Fig. 5). Once the decision factors are identified and selected,
sub-factors are identified to better describe these criteria. For
example, the surface slope is sub-divided into 7 sub-factors
(Eimers et al., 2000) (Pramojanee et al., 2001) and (Yalcin
and Akyurek, 2004).