基于RS和GIS的城市扩展及驱动力研究--以西安市为例

Study of Urban Expansion and Driving Factor Using RS and GIS——A Case Study of Xi'an City

以RS和GIS技术为支撑,基于多时相Landsat遥感数据,采用监督分类、非监督分类和归一化裸露指数（NDBI）等方法提取陕西省西安市城市空间特征信息,结合地学统计方法,定量研究了城市扩张强度、紧凑度等指标。结果表明：西安市城区1988-2002年14 a间面积翻了1.6倍,年平均增长率为8.815%;城区扩展空间主要集中在南北方向;在此基础上,以影响城市扩张视角多元化为出发点,通过分析社会经济因子、人口因子、政策导向性因子和基本建设投资等因子对城区扩张的影响,政策导向性的前提下社会经济（GDP）和人口增长是其核心影响因子。

Based on RS and GIS,Xi＇an City area expansion information were extracted from multi-temporal Landsat data using supervised classification,non-supervised classification and normalized difference barren index（NDBI）.The result shows that Xi＇an city area increased 1.6 times from 1988 to 2002,the average growth rate is 8.815% and the new areas mainly distribute in the north and the south parts of the city,Based on the multi-angle view,the paper analyzed the expansion driving factors,such as social economy（GDP）,population growth rate,policy and the investment of the basic construct,and the result showed that the key driving factor of urban expansion is social economy（GDP）and population growth rate,which are impacted by policy to a great content.