基于DCW和GLCNMO数据的新疆绿洲城市时空变化特征分析

Analysis of spatial-temporal dynamics pattern in Xinjiang Oasis urban based on DCW and GLCNMO data

城市化是社会发展的必然过程。近年来,在新疆城市化发展进程中,城市用地明显向外扩张。本文使用低分辨率遥感影像数据和GIS技术,分别从宏观和中观尺度定量分析了新疆近40a来城市时空变化。利用DCW和GLCNMO数据分别计算了1960年和2003年新疆城市的城市用地比重和年城市增长率指数,从区域尺度和单个城市尺度分析了新疆城市扩张的时空变化过程。结果表明新疆城市结构体系不合理,城市等级规模差距较大;城市化进程存在明显的地域差异,北疆城市多,扩张强度大,南疆城市少,扩张强度较小;城市规模总体上不断扩大,外延式扩张明显,城市化进程正处于加速发展阶段。最后,本文在对新疆城市化进程分析的基础上,从科学构建城市体系,区域平衡角度着手,提出了未来新疆城市发展战略的一些对策和建议。

Urbanization is the necessary process of social devel- opment. In recent decades, urban land expansion in Xinjiang is remarkable. The spatial-temporal changes of Xinjiang during four decades, from 1960s to 2000s, were analyzed by using coarse resolution remote sensing data （DCW and GLCNMO） and GI$, and computing the urban percentage and the annual urban growth rates. The analysis was carried out on a regional and individual urban basis. The results revealed that the city structure system in Xinjiang is not reasonable, the city size difference is large and urbanization has regional difference. The quantity of cities and the expansion intensity are large in northern part of Xinjiang, while it is on the contrary in the southern part. City size is expanding constantly on the whole, and epitaxial expansion is obvious. Urbanization is in the accelerated development stage. Finally, on the basis of analyzing the urbanization process, the present paper puts forward some suggestions on future development strategy of Xinjiang cities from the perspective of the scientific urban system and regional balance.