关键词: 南京, 城市扩展, 遥感, GIS, 时空分异特征, 形态演变, 紧凑度, 弹性系数

Abstract:

Taking Landsat MSS/TM/ ETM+ satellite remote sensing images as data resource，and GIS as charting and analysis method，the relationship between the space and time rule and the shape characteristics of the urban construction land expansion of Nanjing City and the population development were analyzed in this paper，with such indexes as construction land expansion intensity，the centre coordinates，compact ratio，and elasticity coefficient.Using correlation analysis method，the main factors affecting the urban construction land expansion were also identified in this paper.It was revealed that the spatialtemporal variation characteristics of Nanjing urban construction land were obvious from 2001 to 2004，and that Jiangnan main city northeastsouthwest axial and the southeast Jiangning area were the most active expansion parts.Furthermore，during the urban expansion process，compact index reduced and the spatial shape developed to an unsteady state.Since the 21st century，the construction land expansion has been transforming gradually to rationalization direction；but from 1988 to 2001，the expansion elasticity coefficient was insufficiently reasonable；related policy guidance and natural factors were the main affecting factors，and the growth of average salary and the increase of nonagricultural population also played an important role.

Key words: Nanjing City, urban expansion, RS, GIS, spatialtemproal variation characteristics, morphology evolution, compact ratio, elasticity coefficient