基于TM影像的重庆市都市区NDVI时空变化特征

随着城市化进程的不断加快，城市生态环境问题越来越突出，使得对城市NDVI的时空变化研究显得十分迫切。以重庆市都市区作为研究对象，采用1988年、2000年、2002年、2012年的4期LandsatTM遥感数据以及重庆市都市区1∶5万DEM数据，通过人机交互、定量遥感技术以及GIS技术相结合的方法，获取了1988—2012年间研究区NDVI的分布数据。研究表明:在1988—2012年间，重庆市都市区NDVI在时间、空间以及结构上都发生了较大变化。NDVI的变化趋势呈现出一定的规律性，在城市建设用地扩张的区域NDVI指数呈现出下降趋势，而在城市已建成区又具有相对稳定性。研究成果旨在为促进城市可持续发展、优化城市生态环境提供科学依据与参考。

Temporal-Spatial Variation of NDVI in the Metropolitan Area of Chongqing Municipality Based on TM

As the acceleration of urbanization, the urban ecological and environmental problems have becoming more and more outstanding, which makes it very urgent to study the temporal-spatial variation of city NDVI. We took the metropolitan area of Chongqing Municipality as the research example, obtained the NDVI distributed dates in 1988—2012 by combining Human-computer Interaction, quantitative Remote Sense Technique and GIS and through the data sources including 1988, 2000, 2002, 2012 Landsat TM remote sensing data and 1∶50 000 DEM of the metropolitan area of Chongqing Municipality. The results showed that the NDVI of the metropolitan area of Chongqing Municipality had greatly changed in temporal-spatial variation and structures from 1988 to 2012. In addition, the change trend of NDVI appeared a certain regularity and showed a downward trend in the urban expansion area. On the other hand, the change trend of NDVI showed guaranteed relative stability. The result can offer scientific basis and reference for promoting the sustainable development of the city and optimizing urban ecological environment.