新疆乌昌核心区城市空间扩张及格局变化

Urban spatial expansion and pattern based on DMSP/OLS night light data—Take Wuchang core area of Xinjiang as an example

基于2000,2005,2010与2013年DMSP/OLS夜间灯光遥感影像、社会经济统计数据,以动态阈值法、植被指数、统计比较法提取城市建成区范围,结合GIS技术,对新疆乌昌核心区城市空间扩张与建成区格局动态变化进行研究.结果表明,乌昌核心区城市灯光灰度值7个等级呈逐年、逐级波动递增趋势;2000—2013年城市空间扩大2.9倍;城市空间扩展程度指数与非农业人口、人均GDP及二三产业产值呈显著正相关关系;2005—2010乌昌核心区扩展强度指数最大,城市空间整体呈扩张趋势,但建成区紧凑度不高且空间形态不规则.

This article takes the core area of Wuchang,Xinjiang as the research object,based on DMSP/OLS night light remote sensing images,socioeconomic statistics in 2000,2005,2010 and 2013,the dynamic threshold method,vegetation indeXand statistical comparison method are used to recognize scope of built-up area.Combined with the GIS technology,the dynamic changes of urban spatial expansion and built-up pattern in the core area of Wuchang are discussed.The research results show that,the 7 levels of gray values of urban lights in the core area of Wuchang show a year-by-year,step-by-step fluctuation trend.The urban space expanded by 2.9 times.The urban spatial expansion indeXis significantly positively correlated with the non-agricultural population,per capital GDP,and the secondary and tertiary industries.The expansion intensity indeXof the core area of Wuchang from 2005 to 2010 is the largest,and the overall urban space is expanding,but the compactness of built-up areas is not high and the spatial form is irregular.