基于GIS的生态移民选址研究——以大化县为例

Study on the Site Selection of Ecological Migration Based on GIS——A Case of Dahua County

移民安置区的选择是移民工程的前瞻性工作,关系到移民搬迁工作的成败,因此移民安置区的选址问题尤为重要。文章结合前人的相关研究成果,通过筛选确定水系、交通、城镇分布、高程、坡度、断裂构造6个评价指标因子,以GIS空间分析技术为主要支撑结合AHP层次分析法,完成了评价指标体系中各个评价指标因子的信息提取与专题地图制作,对专题图层进行适宜性等级分区和权重赋值,将得到专题图层的缓冲分区图进行叠加分析,得到大化县生态移民选址评价结果,结果表明,适宜区、较适宜区、基本适宜区、不适宜区的比例分别为14%、28%、35%、23%。

The choice of resettlement area is the prospective work of the immigration project,which is related to the success or failure of the resettlement work.Combining the related research achievements of predecessors,6factors including water system,traffic,urban distribution,elevation,slope,fracture structure were considered as for the assessment.GIS spatial analysis technology as the main support combined with AHP analytic hierarchy process,completed the information extraction of each evaluating index in the evaluation index system and the making of thematic maps.The suitable grade partition and weight assignment of the thematic layer were made,the thematic buffer layer partition maps were overlay analyzed,The ecological immigration site selection of Dahua County were acquired.The result showed that the proportion of suitable areas,medium-suitable areas,basic suitable areas and unsuitable areas was14%,28%,35%and23%,respectively.