基于嵌套子集方法对南京市城镇化用地时空变化分析

随着城镇化的加速发展,越来越多的土地资源被占用。本文应用嵌套子集方法,并借助RS和GIS技术,利用1984、1995、2000、2003年4期TM卫星遥感影像,对南京市近20年来城镇扩展情况进行了分析。结果表明:1984─2003年间,随着城市化水平的不断提高,南京市城镇用地面积不断扩大,填充度从1984年的3.5%提高到2003年的7.2%,增加1倍多,并呈嵌套格局,且嵌套程度越来越高;各乡镇填充度的变化表现出差异性,即市区的乡镇、市区周边的乡镇以及在区县的乡镇的填充度增加较大,其他大部分乡镇的填充度虽然都有不同程度的增加,但增加程度不大,还有一些乡镇的填充度没有变化。

Nested Subset Method-Based Analysis of Spatial and Temporal Change in Landuse in Nanjing City Under Its Growing Urbanization

More and more agricultural soils have been alienated as a result of rapid urbanization in the Yangtze Delta. With the aid of the nested subset method,RS and GIS technologies tools and the TM images of the years of 1984,1995,2000 and 2003,expansion of Nanjing city was analyzed in the past 20 years. Results showed that the degree of fill of the land calculated with a professional software tool (Nested Temperature Calculator Version Nov 1998) has been doubled (from 3.5% in 1984 to 7.2% in 2003),forming a nested pattern,higher and higher in degree; Geographical variation can be found of the fill values of different towns. Some towns or districts showed very clear increase in the fill due to the more rapid growing urbanization while some others did less.