珠江三角洲城镇建筑覆盖近期变化研究

Studies on recent built-up land-cover change of urban area in the Pearl River Delta

基于遥感与地理信息系统技术 ,从 1988年与 1998年两个时期研究区域的TM卫星影像提取各城镇的实际建筑覆盖区面积等专题信息 ,并利用Arc/Info8 0 2建立珠江三角洲乡镇级空间数据库。在此基础上重点对珠江三角洲城镇建筑覆盖近期变化的空间扩展特性 ,并就企业、交通设施、人口、区域经济与行政体制等驱动因子进行了初步综合分析。研究表明 2 0世纪末珠江三角洲城镇建筑覆盖总体圈层格局相对稳定 ,核心增长与交通指向扩展非常显著 ,城镇建筑覆盖区增长总量与增长速率空间分布不一致 。

Urban development is significant during the past two decades in the Pearl River Delta(PRD) Many researchers have studied urban development of partial areas in the PRD from different viewpoints recently, but nobody sdudied the urban land cover change of the PRD from the integrated point of view This paper exemines the built up land cover change of the urban area of the whole Pearl River Delta from 1988 to 1998 TM imageries taken from 1988 to 1998 were used to get the built up area thematic information,and a spatial database of the urban areas in the PRD was set up aided by Arc/Info 8 02 We selected the Maximum Likelihood Classifier(MLC) to extract urban built up area themeatic information The spatial features of built up land cover change in urban area were analysed in detail Firstly, the inner circle and outer circle spatial structure of built up land cover distribution kept relatively stable during the study period The total built up area in inner circle is 83 46% of the whole built up area in the PRD in 1988, and it is 84 18% in 1998 Secondly, the core oriented development and transportation oriented development are remarkble The core urban area such as the Guangzhou Foshan metropolis and Hongkong Shengzhen metropolis developed rapidly The urban area along the lines of the 107 national highway,Guangzhou Shenzhen railway and the Guangzhou Zhuhai section of the 105 national highway grows evidently Thirdly, the spatial distribution of the growth amount of built up area differs from the spatial distribution of the growth speed of the built up area greatly Fourthly, the spatial distribution of the average growth intensity index per year(AGIIPY) was analysed, the results show the high value of the AGIIPY distribution are core oriented and trunk road oriented The main driving factors of urban built up land cover change in the PRD were generally discussed The result shows the correlativity between urban built up area and gross output value of industry in the PRD is notable The urban built up area and the total population also have remarkble correlative relationship The other factors such as transportaion conditions,regional economy and administration are very important for urban development