摘要
基于1994年、2004年和2014年重庆市中心城区的遥感影像数据,利用NDISI归一化差值指数提取信息,采用景观格局指数等方法对不透水面的时空变化进行分析。结果表明:①不透水面扩展明显,面积由1994年的103.76 km^2增加到2014年的583.13 km^2,年均增长量逐渐上升;②不透水面围绕城市中心扩展,具有方位分异特征,主要扩展为北方向(渝北区、北碚区)、东北方向(江北区)和西方向(沙坪坝区、九龙坡区);③1994-2004年不透水面主要为分散式扩展,2004-2014年主要为蔓延式和聚合式扩展。获取不透水面时空变化规律能为城市发展规划提供参考;通过合理调节其扩展速度和范围可缓解城市热岛效应,进而改善区域生态环境。
Based on the remote sensing image data of Chongqing downtown area in 1994,2004 and 2014,we used NDISI normalized difference index to extract information,and used landscape pattern indexes to analyze the spatio-temporal changes of impervious surface.The results show that(1)the impervious surface expands obviously,the area increases from 103.76 km^2 in 1994 to 583.13 km^2 in 2014,and the annual average growth gradually increases.(2)The impervious surface expands around the urban center,with azimuthal differentiation characteristics,mainly expanded to the north direction(Yubei District,Beibei District),northeast direction(Jiangbei District)and west direction(Shapingba District,Jiulongpo District).(3)The impervious surface from 1994 to 2004 is mainly decentralized expansion,and the impervious surface from 2004 to 2014 is mainly spread and filled extensions.Obtaining the spatio-temporal changes of impervious surface can provide a reference for urban development planning.And adjusting its expansion speed and range rationally can alleviate the urban heat island effect,and improve the regional ecological environment.
出处
《地理空间信息》
2020年第3期12-15,I0001,共5页
Geospatial Information
基金
国家自然科学基金资助项目(41807498)
重庆市社会民生科技创新专项资助项目(CSTC2015shmszx00010)
重庆市前沿与应用基础研究计划一般资助项目(CSTC2015jcyjA0332)。
关键词
不透水面
时空变化
重庆
景观格局指数
impervious surface
spatio-temporal change
Chongqing
landscape pattern index
