| 凸壳原理用于城市用地空间扩展类型识别 |
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| 引用本文： | 刘纪远,王新生,庄大方,张稳,胡文岩.凸壳原理用于城市用地空间扩展类型识别[J].地理学报,2003,58(6):885-892. |
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| 作者姓名： | 刘纪远 王新生 庄大方 张稳 胡文岩 |
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| 作者单位： | 1. 中科院地理科学与资源研究所,北京,100101
2. 中科院地理科学与资源研究所,北京,100101;武汉大学资源与环境科学学院,武汉,430079 |
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| 基金项目： | 国家自然科学基金项目(90202002)，中科院知识创新工程项目(KZCX-2-308) ~~ |
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| 摘 要： | 针对目前尚缺乏定量方法确定城市用地扩展类型的问题，首次提出了利用计算几何中凸壳原理识别城市用地扩展类型的新方法，阐述了该方法实现步骤和判别标准，凸壳方法可以区分城市用地扩展的两种类型，即填充类型和延伸类型。基于国家资源环境数据库，应用研究的结果表明，从1990年到2000年，安徽省城市用地扩展类型以填充类型为主，而用地扩展的结果导致城市形态的变化，这一时期安徽省城市轮廓平面形态逐渐趋于紧凑。
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| 关 键 词： | 凸壳原理 城市用地 空间扩展 扩展类型 填充类型 延伸类型 安徽 城市形态 |
| 收稿时间： | 2003-05-17 |
| 修稿时间： | 2003年5月17日 |
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| LIU Jiyuan,WANG Xinsheng,ZHUANG Dafang,ZHANG Wen,HU Wenyan.null[J].Acta Geographica Sinica,2003,58(6):885-892. |
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| Authors: | LIU Jiyuan WANG Xinsheng ZHUANG Dafang ZHANG Wen HU Wenyan |
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| Abstract: | Faced with the problem of lacking quantitative approaches to identify the types of urban land expansion, a new method based on the principle of convex hull was presented in this paper, which is to define the types of urban land expansion by the proportion of the area located inside or outside the convex hull of a city's outline. In detail, we first approximated the urban planar outline by selecting finite points from it. The more the amount of points is selected, the more they approximate to the original urban outline. The amount of points selected should be depended on the hardware resources of the computer and the need of the accuracy. Then, the convex hulls of those point sets were respectively constructed by employing our developed algorithms and programs, and the proportions of the area located inside or outside the convex hull are obtained. If the area inside one convex hull is more extensive than the one outside, then the type of urban land expansion of this city belongs to the 'infilling' type, otherwise, the 'extension' type. A case study was presented by using the National Resources and Environmental Database. The result shows that the type of urban land expansion of 29 cities out of the 40 cities in Anhui is the 'infilling' type from 1990 to 2000 and the remaining 11 cities, the 'extension' type. Urban land expansion results in changes of the morphology of urban outline. As indicated 32 cities are more compact from 1990 to 2000 and the other 8 are less compact. Generally, a more compact city has more advantages than a less compact city, so changes of the form of Anhui cities are considered being on a good way. |
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| Keywords: | convex hull the type of urban land expansion the compactness ratio of urban form Anhui |
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