LANDFILL SITE SELECTION BY USING PAIRWISE COMPARISON, RATING, RANKING AND TRADE-OFF METHODS FOR CRITERIA WEIGHTING

Any multi criteria decision analysis process need to weigh the criteria and to know any weighting method the best to use according the nature and degree of complexity of the problem. There are four method for criteria weighting Rank, Rating, Pairwise and Trade-off methods. In this study, which was done in Najaf ? Iraq used this methods to weigh the seventeen criteria used to select landfill site within integration of (GIS -MCDA) in Najaf governorate. There is no difference between the results within Pairwise or Ranking method only in size of landfill in west part of study area (five sites were selected in each try). Within trade-off and rating methods, there are more than five site were selected.