Survey of Hail Disaster with Satellite Remote Sensing
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.