冰雹灾害的卫星遥感监测方法初探

Survey of Hail Disaster with Satellite Remote Sensing

利用气象卫星遥感资料 ,对发生的冰雹灾害进行监测 ,对其原理和方法进行探讨。通过对 1 998年以来发生的冰雹灾害的个例分析 ,证明此项技术是可行的。依据受冰雹灾害后 ,植被指数的降低来检测受灾的区域 ,确定受灾的程度。在作物不同的生育阶段 ,选择不同类型的植被指数。受气象卫星分辨率的限制 ,对于受灾较轻和受灾范围较小的区域不易被分辨出来。对受灾较重的区域 ,可以确定出灾害的损失程度。

With NOAA-AVHRR imagery, an approach to survey the hail disaster is made. The technique is examined through the study on the hail disasters from 1998 to 2000. The vegetation indexes will decrease after a hail disaster,so the area and the degree suffer for the hail disaster can be identified with vegetation indexes. It must be pointed out that in the different growing periods , different vegetation index will be selected. Although constrained by the resolution of the satellite imagery, it is not easy to identify the light hail disaster area and the very small ones,it is still feasible to identify the stricken degree in the heavily hail disaster.