基于土地利用数据的昆明市城区扩展趋势研究

Study on Urban Extension Trend of Kunming City Based on Land Use Data

城市土地利用空间格局及动态演化主要是由于城市的不断扩展引起的。通过研究昆明市的土地利用变化特点和土地利用转移变化转移规律,找出了2009-2017年昆明市城区的土地利用变化趋势,并依据城市扩展强度指数、城市年均扩展速度指数等指标,结合城市扩展的凸壳原理探究了昆明市城区西北、西南、东南、东北4个方向的空间扩展模式。研究表明9 a的时间,昆明市的建设用地从493.00 km^2增长到592.15 km^2,增加了99.15 km^2,增长了20.11%,城区扩展的速度为11.017 km^2/年,扩展强度指数为0.022,而且东南方向是扩展速度最快的。通过对昆明市城区的扩展态势进行分析,可以掌握城市发展的规律,指导城市空间布局优化,服务政府科学决策。

The spatial pattern and dynamic evolution of urban land use are mainly caused by the continuous expansion of cities.By studying the characteristics of land use change and the laws of land use transfer and change in Kunming City,we found out the trend of land use change in Kunming’s urban areas from 2009 to 2017.According to the urban expansion intensity index and the urban expansion average speed index,we explored the spatial expansion patterns of the northwest,southwest,southeast and northeast directions of Kunming City based on the convex shell principle of urban expansion.The study results show that in nine years,the construction land in Kunming City has increased from 493.00 km2 to 592.15 km2,an increase of 20.11%,and the urban expansion speed is 11.017 km2/a.The expansion intensity index is 0.022.And the southeast is the fastest expansion.By the analysis of the expanding situation in Kunming City,we can master the laws of urban development,guide the optimization of urban spatial layout,and serve the government's scientific decision-making.