基于时序NDVI的昭觉植被覆盖度变化研究  

Fractional Vegetation Coverage Changes Based on NDVI Time Series in Zhaojue County

作　　者：陈江玲[1] 徐京华[1] 李国明[2] 王渊博[1] 武文娟[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756 [2]四川省第三测绘工程院,四川成都610500

出　　处：《测绘与空间地理信息》2016年第11期72-74,78,共4页Geomatics & Spatial Information Technology

基　　金：国家科技支撑计划项目"地理国情监测系统"(2012BAH28B04);四川省科技支撑计划项目"测绘地理信息共享服务键技术研究"(2015SZ0046)资助

摘　　要：归一化植被指数(NDVI)能精确地反映植被绿度、光合作用强度,在一定程度上反映着植被的演化信息,是评价生态环境状况的重要指标之一。本文利用Landsat TM数据分别对昭觉地区2009年和2014年的NDVI进行计算,并分别利用均值法、像元二分模型及NDVI差值植被指数对研究区域植被覆盖变化进行定量分析,结果表明:昭觉县NDVI均值上升了11.6%,植被覆盖度中极度改善的面积比例约占38%,昭觉县整体NDVI植被覆盖度显著提高,并对其变化原因进行简要分析,为生态环境建设提供决策依据。Normalized Difference Vegetation Index （NDVI） can accurately reflect the vegetation greenness, photosynthesis intensity, to a certain extent reflects the evolution of vegetation information, it is an important indicator of the evaluation of the ecological state of the environment. In this paper, the use of Landsat TM data respectively Zhaojue region in 2009 and 2014 NDVI calculated , at the same time, analyzed vegetation cover change with data by using average method, sub - pixel analysis model and NDVi difference vegetation index , the results showed that： the NDVI average increased by 11.6%, the proportion of fractional vegetation coverage is extremely improved about 38%, overall NDVI fractional vegetation coverage obviously increased, and a brief analysis of its reasons for the changes, to provide decision support for ecological environment construction.

关 键 词：NDVI 植被覆盖度 像元二分模型 均值法 

分 类 号：P209[天文地球—测绘科学与技术]