基于夜间灯光数据的武汉市城镇用地扩张识别与空间分布特征研究

以武汉市为例,基于DSMP/OLS夜间灯光数据、多源遥感影像数据和统计年鉴数据,通过构建城镇用地复合指数,提取2000,2005和2010年3个年份的武汉市城镇用地面积,分析了武汉市城镇用地扩张的形态特征、城镇用地演变规律和影响其变化的因素.研究表明,2000年到2010年之间武汉市的城镇用地扩张速度不断加快,并呈现非紧凑型发展.城镇用地空间扩张逐渐复杂化,离散破碎之势逐年显著.位于西北和东南方向上距主城20～30km的远城区扩张强度最大;总体城镇用地空间格局基本稳定,受地理条件、空间距离、经济发展和政策指引等因素的影响,不同方向上城镇用地扩张差异化显著.

Urban Land Expansion Identification and Spatial Distribution Characteristics of Wuhan City Using DMSP/OLS Nighttime Light Data

This research focused on extracting the urban area by calculating Normalized Urban Areas Composite Index from 2000 to 2010. Analyzing the morphological characteristics of urban land expansion, spatial evolution characteristics and factors that affect their changes about Wuhan urban area, combining the DSMP/OLS nighttime light data with the help of multi-source remote sensing images and statistical data. The study shows that the expansion rate of urban land in Wuhan was accelerating between 2000 to 2010 and presented a non-compact development. The expansion of urban land space is gradually complicated, and the trend of discrete fragmentation is significant year by year. The areas which located in the northwest and southeast direction from the main city of 20-30km have the largest expansion intensity. The overall pattern of urban land use is basically stable. Affected by factors such as geographical conditions, spatial distance, Economic development and policy guidelines, differences in urban land expansion in different directions are significant.