基于NOAA/AVHRR数据的区域沙尘暴强度监测

Monitoring the intensity of regional dust storm using NOAA/AVHRR data

利用ＮＯＡＡ／ＡＶＨＲＲ数据，通过查找表增强显示沙尘暴信息和利用经验模型提取沙尘信息，探讨了 区域沙尘暴强度监测的方法．研究发现，利用可见光、近红外和远红外通道多光谱合成遥感数字图象对沙尘 暴的监测和沙尘信息的提取效果明显；在低檀被覆盖区域，利用ＧＶＩ指数提取沙尘信息是不可行的，但这 一指数有助于提取海面上的沙尘信息；并对沙尘浓度提取进行了探讨，以期显示区域沙尘暴的强度．

This paper discussed the methods about the intensity monitor of regional dust-storm with NOAA/AVHRR data, which highlighted dust-storm images by Lookup Table (LUT) and extracted dust-storm spatial information with empirical model. The study showed that the multi-spectral im- age of visible, near-infrared and far-infrared bands can monitor the dust-storm and sort its information effciently; and in the region of lower rate of vegetation coverage, it is not feasible to extract dust-storm information by the global vegetation index IGV, but it is helpful in ocean re- gion. Furthermore, the study tried to display the intensity of regional dust-storm by extracting the dust-storm density.