基于多时相数据的沙尘过程动态监测

A dust storm process dynamic monitoring with multi temporal MODIS data

探讨了利用Terra和Aqua双星多时相数据确定沙尘移动路径的方法。以2007年3月26日～27日的一次沙尘过程为例，根据沙尘及其它地物的反射和吸收特征，针对白天和夜间卫星数据的特点，分别确定了白天和夜间沙尘监测的多通道阈值法。在监测出沙尘范围，划分强度等级的基础上，确定了沙尘移动轨迹，监测结果与气象部门监测结果一致。研究结果表明：多时相数据在沙尘过程动态监测方面有着广阔的应用前景。

In this paper, the method of using Terra and Aqua MODIS data to monitor the moving trace of dust storm has been discussed. According to the reflection and absorption characteristic of the dust storm occurred in March, 26 -27, 2007, as well as the characteristics of daytime and nighttime data, the multi-channel threshold method has been given to monitor dust storm at daytime and nighttime. The scope of dust storm being extracted and the intensity grades being estimated, the moving trace is monitored successfully. The result is in great agreement with the meteorological monitoring. The research proves that the dust storm process dynamic monitoring with multi-temporal data has a great application prospect.