The Improvement on the GIS based Land Suitability Evaluation Model(LSEM)
基于GIS的土地适宜性评价模型的改进

Land suitability evaluation is an important field where GIS are applied.This paper firstly introduces the conventional LSEM,which has the following disadvantages: one is that no difference is identified in the different thematic classes with the same score,the other is that the difference between different thematic classes is exaggerated around the division of scores.Then,it presents the second model which makes improvement on the conventional one by borrowing the idea of certainty factor from expert system.It is shown that the model after improvement encompasses more enriched and precise information than the conventional one,thereby providing more options for decision maker.