卫星遥感信息在贵州干旱监测中的应用

The Application of Satellite Remote Sensing Information for Drought Monitoring in GuiZhou

应用ＮＯＡＡ气象卫星ＡＶＨＲＲ资料探讨了监测贵州干旱的３种方法，即植被指数法、第４通道遥感下垫面亮温法和植被供水指数法。结果表明，植被供水指数与地面干旱指数相关性最好，其空间分布与地面旱情分布基本一致。由此，用植被供水指数确定了各地州的受灾面积。

Three different methods for monitoring dry disasters in Guizhou using NOAA AVHRR data were discussed. The three methods are vegetation index method, remote sensing brightness temperature of earth’s surface through NOAA AVHRR channel 4 and vegetation supply water index method. The results show that the correlation coefficient between vegetation supply water index and surface drought index is the highest. Its spatial distribution is consistent with surface drought distribution. Thus the drought area in different regions could be determined and regression equations to estimate surface drought index by vegetation supply water index were established.