50年来太湖水网地区城市化空间过程的监测与模拟Ⅱ.基于栅格单元扩展优先度的城市扩展模拟
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* 国家重点基础研究发展规划“973”项目(G1999011810);中国科学院创新方向项目(KZCX3SW427);中国科学院南京土壤研究所所长基金(ISSDF0007)资助


MONITORING AND MODELING OF URBAN SPATIAL EXPANSION IN TAIHU LAKE AREA,CHINA IN THE LAST 50 YEARS Ⅱ. URBAN EXPANSION MODELING BASED ON CELL EXPANDING PRIORITY
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    摘要:

    城市空间扩展主要受水系以及道路、桥梁建设制约,而水系、道路、桥梁都占有一定空间位置,因此,对城市扩展的空间模拟可以转化为分析城市扩展与水系、道路和桥梁的空间关系来解决。本研究以地理信息系统的距离分析为基础,通过分析区域内各个栅格单元与水系、道路、桥梁(可达性)以及原城区的空间距离,确定一定区域内各个栅格单元扩展的优先次序,再按该次序填充,并利用实际面积作为控制,确定城市的空间范围。通过对宜兴城区1984~2000年的空间扩展模拟研究发现,该方法模拟结果与实际城区吻合率可以达到80%以上;通过考虑更多影响因素可望提高空间模拟精度。

    Abstract:

    The research on urban expansion in Yixing city shows that the city's growth is greatly affected by river systems and communicat ion networks (roads and bridges).Since they occupy certain land spaces, modeling of urban expansion can be transformed into analysis of their spatial relationships with the city's growth.Based on distance analysis by using grid GIS, this paper is trying to simulate spatial distribution of Yixing city by firstly calculating spatial distances from each cell to the river system, roads, and the former city zone in the whole region to determine the priority of each cell in expansion, and then filling in the whole region according to each cell's priority in expansion.When the total area of the filled cells is near the real urban area then stop filling in and thus the simulated city distribution would be determined.The case study of Yixing city in China shows that the precision of spatial simulat ion can be as high as 80% as compared with the real city.The precision is expected to be improved by taking into account more factors that might affect town sprawl.

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潘贤章,赵其国.50年来太湖水网地区城市化空间过程的监测与模拟Ⅱ.基于栅格单元扩展优先度的城市扩展模拟[J].土壤学报,2005,42(3):386-389. DOI:10.11766/trxb200403120306 Pan Xianzhang, Zhao Qiguo. MONITORING AND MODELING OF URBAN SPATIAL EXPANSION IN TAIHU LAKE AREA, CHINA IN THE LAST 50 YEARS Ⅱ. URBAN EXPANSION MODELING BASED ON CELL EXPANDING PRIORITY[J]. Acta Pedologica Sinica,2005,42(3):386-389.

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  • 收稿日期:2004-03-12
  • 最后修改日期:2004-08-01
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  • 在线发布日期: 2013-02-25
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