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摘要： 当前，城市建成区的自动提取仍然是一难题。以上海市为例，利用（Index-based Built\|up Index）IBI建筑用地指数提取后的二值影像作为地理元胞的初始状态，采用元胞自动机模型，通过阈值分割、腐蚀、连通性检测等一系列处理来提取连续、稳定的城市建成区。将这一方法应用在 Landsat系列影像上，提取出了上海市1987至2015年间5个年份的城市建成区。同时进一步采用城市扩展强度指数、同心圈图和雷达图分析等方法研究了上海市近30 a来城市建成区的时空演化格局。结果表明：上海城市建成区面积由1987年的195  km2增加到2015年的1759 km2，增幅达802%。在1987至2002年的15 a间，城市建成区呈中低速扩张，主要沿黄浦江呈南北向扩张；2002年以后，城市建成区高速扩张，扩张方向转为东西向。总体来看，上海市近30 a来经历了快速的城市扩张过程。 关键词： 元胞自动机;  建成区提取;  IBI;  城市扩张;  上海     Abstract: At present，the automatic extraction of urban built\|up area is still a problem.Taking Shanghai city as an example，this research uses the binary image，which was derived from an IBI(index\|based built\|up index)image，as the geographical cellular automaton initial input data.This was then imported to the extended cellular automata model for further processing.After a series of processing such as thresholding，corrosion and connectivity test，the urban built\|up area was simulated and can be extracted.Based on this method，the urban built\|up area of Shanghai in five different years between 1987 and 2015 was extracted using multi\|temporal Landsat images of Shanghai.In addition，the urban growth intensity index，the concentric buffers analysis and radar chart analysis were calculated and used to analysis spatiotemporal pattern of Shanghai urban expansion in the 28 study years.The result shows that the built\|up area of Shanghai was expanded from 195 km2 in 1987 to 1759 km2 in 2015，which is eight times as large as that in 1987.In the period between 1987 and 2002，the urban built\|up area expanded mainly along the North\|South axis of the Huangpu River.However，after 2002 the expansion rate was increased more quickly，and the direction of the expansion was shifted to an east to west direction.Generally speaking，Shanghai has experienced a rapid urban expansion in the recent three decades.

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