基于多时相TM影像的城市边缘区划分及其变化监测

城市边缘区作为城市和农村之间的过渡地带,是城市扩张过程中土地利用变化最为活跃的部分。在城市边缘区,城市用地类型与其他的土地利用类型,比如耕地、林地、牧草地和水域等混合在一起,并且这些非城市用地类型随着城市化的进程很快转换为城市用地。城市边缘区被定义为城市内边界和外边界之间的环状区域,内边界分离城市核心区与城市边缘区,外边界分离城市边缘区与农村腹地。本研究采用一种新的方法来对城市边缘区进行界定,以及对其动态变化进行监测研究。通过多时相遥感数据的分类,提取城市及其周边的土地利用信息,并对其空间结构模式用地理景观指标进行定量的描述,最后借助空间聚类获取边界阈值来划分城市边缘区并对其变化进行监测。

Urban Fringe Extraction and Its Change Monitoring Using Multi-temporal TM Image

Urban fringe is the transition belt between the urban and rural, which is the most active part in urban sprawl process. In urban fringe belt, urban land use patches mix with other land use patches, such as agriculture, forest, rangeland, etc. Non-urban land use patches are soon converted to urban land use patches in the urban sprawl process, especially in develo- ping countries with high urbanization speed, such as China. The urban fringe belt is defined by its outer and inner boundary, which separate the inner urban core, urban fringe and rural area. In this article, we put forward a new method on urban fringe belt extraction and its dynamic change monitoring, which introduces multi-temporal remote sensing images in this research. From the remote sensing image classification results, we can extract useful spatial structure pattern information of land use, and this information is used to find the outer boundary and inner boundary of the urban fringe. By integrating multi-temporal images into the process, we can dynamically monitor the urban fringe change. This study analyzes urban fringe of the Beijing city using multi-temporal Landsat images （1988, 1994 and 2000）, the urban fringe belt of Beijing city is figured out and the change is also mapped.