中文摘要：

随着经济的快速增长和城市化进程的加速推进,城镇建设用地的大规模扩张对区域土地资源承载力与生态安全形成了巨大压力。有效识别与定量评定城镇建设用地扩展类型和空间格局是城市集约、节约用地的重要前提之一。本文以快速城市化地区的东莞市为例,在遥感与GIS技术支持下,建立一种基于空间拓扑运算的简便方法,将该市1979—2005年间不同阶段的城镇建设用地扩展类型进行定量识别。结果表明：1979—2005年,东莞市建设用地扩展类型的变化反映出该市的扩张经历了＂跳跃式分散-外延式集聚-混合式扩散-外延式集聚＂的一般过程;外延式扩展是研究时期内主要的扩展类型,但在城市扩展早期跳跃式扩展占主导地位;城市扩展后期,在有限土地资源及城市地域空间限制的影响下,跳跃式扩展比例下降而填充式扩展比例增大。

英文摘要：

With the rapid development of economy and urbanization,built-up land expansion has posed an enormous pressure on land carrying capacity and ecological security.To identify and quantify the built-up land expansion pattern is one of the prerequisites of land consolidation.Taking Dongguan as an example,and based on GIS and RS techniques,an algorithm was established by spatial topology operation to quantitatively identify the built-up land expansion in different phases from 1979 to 2005.The built-up land expansion pattern in Dongguan in 1979-2005 could be described as a general process of leapfrog-edge-expansion-mixed-expansion-edge-expansion.Edge-expansion was the main expansion type,but leapfrog growth was dominant at the early phase.During the late phase of land expansion,the proportion of leapfrog growth decreased while that of infilling growth increased,because of the limited land resources and urban space.