基于GIS的大连市建设用地生态适宜性评价

在ERDAS8.7支持下,对大连市域2004年TM(Thematic Mapper)影像进行了解译,提取河流、林地、耕地、建成区等有代表性的多因子图层;在Arc GIS 9.0支持下,通过1∶50000地形图建立数字高程模型,提取坡度、高程等地形因子;同时将人口、经济等数据在Arc GIS 9.0平台下建立空间数据库,运用成对明智比较法确定权重,并通过Arc GIS 9.0的空间分析模块进行因子叠加分析,对大连市城市建设用地的生态适宜性进行了研究.结果表明:最适宜用地(含建成区)占16.93%,适宜用地占17.01%,基本适宜用地占20.01%,不适宜用地占18.67%,不可用地占27.38%.结合评价结果对不同等级的用地类型进行提议,为研究区的生态环境保护和城镇用地拓展提供参考.

GIS-based ecological suitability evaluation for town development used-land in Dalian city

The sustainable development of ecology and environment is the base of regional sustainable development,while the evaluation of land eco-suitability is the base and premise of the planning on ecology and environment.With the help of advanced GIS and RS technology,and by using the multi factor-overlay method,multi factors weighted with pair-wise comparisons,land eco-suitability in Dalian,Liaoning Province was thoroughly analyzed by selecting regionally representative factors.Five classes of ecological suitability ranging from extreme to low were generated: extreme suitability zone,suited zone, moderate suitability zone,low suitability zone and ill-suited zone,and advices and corresponding measures for different zones are put forward.The results showed that:about 46.05% of the study area was lower moderate ecological suitability zone,which showed that the eco-suitability was rather low,thus providing scientific foundation for rational urban industry distribution and regional eco-environment protection in the future.