利用RS和GIS技术对沈阳市城市边缘区扩展的研究

Urban Fringes Extension by Using GIS and RS in Shenyang

为深入分析沈阳市城市边缘区扩展的特征和趋势,利用RS技术,解译了沈阳市1979,1992,2010年的遥感影像,并采用景观紊乱度指数,对3年的沈阳城市边缘区范围进行界定。结合GIS技术的空间分析功能,从扩展数量、扩展方向、扩展形态和区域、扩展强度等方面对沈阳城市边缘区的扩展进行研究。结果表明:沈阳市城市边缘区扩展逐步加快,1979~2010年,沈阳市城市边缘区的范围增加1010.71km2,面积扩大3.7倍,平均每年扩展32.60km2。1992~2010年沈阳城市边缘区的扩展强度是1979~1992的5倍,在扩展数量、速度方面都远大于后者,呈现向东和南的扩展的趋势。这与沈阳市的经济发展情况基本相符,表明该方法具有可行性,同时该研究能为深入研究城镇化进程和编制相关规划提供依据。

This study aimed to analyse the development extension characteristics and trend in Shenyang urban fringe. The remote sensing images in 1979, 1992 and 2010 were collected as basic dates, with the landscape disorders index, defined the area of Shenyang urban fringe. With the use of GIS technology, the urban fringe expansion from number, direction, intensity and other aspects were analysed in1979, 1992 and 2010. The results showed that the urban fringe expansion was accelerating. In 1979-2010, the area of Shenyang urban fringe extended by 1010.71 km2, increased by 3.7 times, and with an average annual expansion of 32.60km2. The expansion intensity of Shenyang urban fringe in 1992-2010 was 5 times than in 1979-1992. The extension speed was much high with a obvious trend from East to South. The result was consistent with the actual situation of Shenyang, indicating this method was feasibility and rational. This study could provide a basis for in-depth study of the urbanization process and related planning.