| 摘要: |
| 以重庆主城区1986、1995、2004、2007、2010及2014年LandSat TM 遥感影像作为数据源，在利用GIS技术对重庆主城区城市用地提取的基础上，运用空间叠加技术对重庆主城区城市用地扩展进行方向划分，同时选择城市扩展指数、扩展重心迁移模型、紧凑度、分形维数和弹性系数的研究方法，系统分析重庆主城区城市用地扩展的时空特征；结果表明：近30年间，重庆主城区城市用地增加527 km2，年均扩展速率达到18.82 km2；正北、正西和西北方向扩展面积较大，东南方向扩展面积较小，城市重心坐标整体向北偏移；受到自然条件的限制，城市用地扩展表现为组团式、非紧凑的形态，以后的城市用地扩展应更加注重建成区内部的填充；研究结果有助于了解重庆主城区城市用地扩展的时空变化特征，为重庆主城区的城市规划和可持续发展提供参考依据。 |
| 关键词: 重庆主城区 城市用地扩展 紧凑度 分形维数 |
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| Study on Temporal and Spatial Characteristics of Urban Land Expansion Based on RS and GIS ——Taking Main City of Chongqing as an Example |
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GUO Hong lei, ZHOU Qi gang
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| Abstract: |
| By taking LandSat TM remote sense images in 1986, 1995, 2004, 2007, 2010 and 2014 as data sources, based on using GIS technology to extract urban land of the main city of Chongqing, this paper uses spatial overlay technique to make direction division of urban land expansion of the main city of Chongqing, and by selecting urban expansion index, expansion centroid migration model, compact, fractal dimension, elastic coefficient as the research methods, systematically analyzes temporal and spatial characteristics of urban land expansion of the main city of Chongqing. The results show that in recent nearly 30 years, the urban land of the main city of Chongqing increased 527 km2, yearly average expansion rate reached 18.82 km2, that the expansion area in the north, the west and the northwest is bigger, that the expansion area in southeast is smaller, and that the coordinate of the urban center of the city shifts to the north. Limited by natural condition, the urban land expansion shows a group type but non compact form. In the future, the expansion of the urban land should pay more attention to the internal filling. The research results are helpful to know the feature of temporal and spatial change of urban land of the main city of Chongqing and provide reference for urban plan and sustainable development of the main city of Chongqing. |
| Key words: the main city of Chongqing urban land expansion compact ratio fractal dimension |
