1979—2006年沈阳市城市空间扩展过程分析

基于1979、1992、2001和2006年遥感影像资料，利用人机交互式方法提取了沈阳市城市扩展信息，并借助GIS技术对空间数据的统计分析功能，从城市扩展强度、重心坐标、紧凑度、分形维数和城市扩展弹性系数方面对沈阳市城市扩展的时空变化特征及其驱动力进行了分析.结果表明：1979—2006年间，沈阳市城市建设用地面积持续增加，扩展强度逐渐增强，以2001—2006年间的城市扩展规模和速度最大;沈阳市城市扩展具有明显的空间分异特征，城市重心总体向西南方向偏移;紧凑度逐渐减小，分形维数逐渐增大，城市空间形态日益复杂;自然环境因素、经济发展、人口增长、交通基础设施建设以及政府政策和城市规划是沈阳市城市扩展的主要驱动因素.

Analysis on urban spatial expansion process in Shenyang City in 1979-2006.

Based on the 1979, 1992, 2001 and 2006 satellite images, the spatial expansion information of Shenyang City was extracted by human-computer interactive method, and the temporal and spatial expansion characteristics of Shenyang City as well as their driving forces were analyzed from the aspects of growth intensity, center coordinates, compact index, fractal index, and elasticity coefficient, with the help of the statistic and analytic functions of GIS for the spatial data. The results showed that in 1979-2006, both the urban build-up area and its expansion rate in Shenyang were increased continuously, and reached the maximum in 2001-2006. The urban expansion showed obvious spatial heterogeneity, with the gravity shifted to the southwest. In the meantime, the compact index was decreasing while the fractal index was increasing, implying that the urban spatial configuration in Shenyang became more and more complex. Natural environmental factors, economic development, population growth, traffic infrastructure construction, and government policy and planning were the main driving forces of the urban expansion.