基于MODIS数据的京津唐地区干旱监测研究  

Application of MODIS Image in Monitoring Drought Space in Jing-Jin-Tang Region

作　　者：颜梅春[1] 张先聪[1] 胡莎 王元超[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]南京国图信息工程股份有限责任公司,江苏南京210036

出　　处：《地理与地理信息科学》2012年第2期94-98,103,共6页Geography and Geo-Information Science

基　　金：中央高校基本科研业务费专项(2009B11714)

摘　　要：京津唐地区由于降水量不均,常出现丰枯交替或连枯、连丰现象,近几十年来呈现涝年减少、旱年增多趋势。该文利用MODIS数据,采用温度植被干旱法,结合京津唐地区的地形植被覆盖条件,利用2010年6-7月共5d的归一化植被指数(NDVI)、增强植被指数(EVI),借助分裂窗法反演地表温度(Ts),构建NDVI-Ts和EVI-Ts特征空间,结合研究区域实际情况确定干、湿边方程,建立了基于温度植被干旱法(TVDI)的干旱监测模型,对京津唐地区的干旱情况进行分析,比较了TVDIN和TVDIE的敏感性。结果表明:利用TVDI法对京津唐地区进行遥感干旱监测是可行的,并且TVDIE比TVDIN监测效果更好,MODIS数据可很好地满足大范围实时动态监测要求。Jing-Jin-Tang region suffers from droughts even as its important role in the nation.So we should try hard to reduce drought harm,and the first job is obtaining the drought status information of the area surface.In this paper,combined with the vegetation cover conditions of Jing-Jin-Tang region,the Temperature-Vegetation Dryness Index gained from MODIS image and the method of inverse success split window surface temperature（Ts） is used for the drought analysis.Based on the data of 5 dates in June 2010 and July 2010,NDVI-Ts and EVI-Ts space which means the TDVIN（Temperature with Normalized Difference Vegetation Index） and TDVIE（Temperature with Strengthen Vegetation Index） of each date are constructed and compared,and the dry edge equation and the wet edge equation are built combining with the actual situation of the study area,then the drought monitoring model based on Temperature-Vegetation Dryness Index（TVDI） is built.At last,the analysis of the drought situation of Jing-Jin-Tang region is done after the sensitivity comparison of TVDIN with TVDIE.The results shows that TVDI drought monitoring model application is feasible in Jing-Jin-Tang region,and which gained from EVI is more adaptive,MODIS images can be used to monitor drought of large scale area dynamically in real time.

关 键 词：MODIS数据 京津唐区域 温度植被干旱法 

分 类 号：S423[农业科学—植物保护]