条件植被温度指数在华北平原干旱监测中的应用

APPLICATION OF THE VEGETATION TEMPERATURE CONDITION INDEX TO DROUGHT MONITORING IN NORTH CHINA PLAIN

以华北平原部分地区为研究区域,应用MODIS多时段卫星遥感数据进行了归一化植被指数和地表温度的计算和反演,应用条件植被温度指数对研究区域2003—2006年每年5月上旬的干旱进行了监测.以监测结果为基础,在时间和空间分布上分析了研究区域的旱情.应用降水量数据和土壤表层含水量数据对干旱监测结果进行了验证,结果表明VTCI与最近1个月的降水量具有显著的线性相关性,VTCI与土壤表层含水量有较好的线性相关性,验证了VTCI是一种近实时的干旱监测方法.

MODIS multi-temporal images are used to calculate and retrieve normalized difference vegetation index （NDVI） and land surface temperature （LST）. Vegetation temperature condition index （VTCI） is used to monitor droughts in North China Plain on the first ten days of May in the years from 2003 to 2006. Based on the results of drought monitoring, temporal and spatial distributions of droughts in the study area are briefly discussed. The drought monitoring results are validated by using precipitation and soil surface moisture. There is a significant linear correlation between precipitation and VTCI. And a good linear correlation between VTCI and soil moisture at surface layer respectively. And VTCI is proved to be a near-real time drought monitoring approach.