条件植被温度指数干旱监测方法的完善  

Further improvement of the approach to monitoring drought using vegetation and temperature condition indexes from multi-years' remotely sensed data

作　　者：孙威[1] 王鹏新[2] 韩丽娟[3] 颜凯[2] 张树誉[4] 李星敏[4] 

机构地区：[1]中国农业大学资源与环境学院,北京100094 [2]中国农业大学信息与电气工程学院,北京100083 [3]北京师范大学地理与遥感科学学院,北京100875 [4]陕西省农业遥感信息中心,西安710015

出　　处：《农业工程学报》2006年第2期22-26,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(40571111;40371083);教育部科学技术研究重点项目(105013);国家高技术研究发展计划(863计划)课题(2003AA209080)资助

摘　　要：应用NOAA-AVHRR多时段卫星遥感数据,以陕西省关中平原为研究区域,建立了条件植被温度指数干旱监测方法,讨论了植被指数和地表温度特征空间中冷边界和热边界的确定方法。通过气象网站的降水量资料验证了该研究区域1999年以来每年5月上旬的干旱监测结果,结果表明条件植被温度指数与降水量间的相关性随着累计时间的增加而降低,与最近月份降水量的相关性最好,证实了冷边界和热边界确定方法的合理性以及条件植被温度指数是一种可行的、近实时的干旱监测方法。This study is focused on developing appropriate methods for determining the ＂warm edge＂ and ＂cold edge＂ of vegetation temperature condition index（VTCI） drought monitoring approach. By integrating AVHRR＇s land surface temperature （LST） and normalized difference vegetation index（NDVI） products, the edges＇ determining methods were studied by Using the multi-years＇ composited LST and NDVI products in the given period of the first ten days of May from 1999 to 2003. The results show the ＂warm edge＂ can be determined by using multiyears＇ maximum value composited LST and NDVI products in the given period. While, the ＂cold edge＂ can be determined by applying the combinations with the multi-years＇ maximum value composited NDVI product and a minimum composited LST product. The minimum LST product was acquired by using the minimum value corn- positing technique to process each year＇s maximum value composited LST products. Ground-measured precipitation data in Guanzhong Plain, Shaanxi Province of China were employed to validate the edges＇ determining methods and VTCI approach. A linear correlation analysis was applied to study the correlation between precipitation and VTCI. There are positive correlations between precipitation and VTCI, the correlation coefficients between VTCI and cumulative precipitation in one or two periods of ten days interval are the highest. These results indicate that the edges＇ determining methods are feasible, and VTCI is a close real-time drought monitoring approach.

关 键 词：条件植被温度指数 干旱监测 热边界 冷边界 

分 类 号：P426.616[天文地球—大气科学及气象学] TQ437.6[化学工程]