Research on the Identification Threshold of Dust Storm based on FY-4A Meteorological Matellite Multi-channel Combination
Satellite remote sensing has unique advantages in monitoring sand and dust aerosols,and is a key technical support for identification research of sand and dust.To improve the accuracy of dust storm identification,the reflectivity and bright temperature data of 14 channels of FY-4A meteorological satellites are utilized to identify sand and dust weather phenomena through the comprehensive analysis method of multi-channel thresholds of targets,and to establish and optimize the identification thresholds of sand and dust storms,to provide support for the intelligent analysis of identi-fication models of sand and dust storms weather phenomena.The results show that visible and near-infrared channels change significantly when there are clouds,the difference between the bright temperature values of visible and near-in-frared channels and short-wave infrared channels in the dust area is small,and the value of short-wave infrared channel is greater than that of visible and near-infrared channel.The mid-wave infrared channels showed the same trend in the dust area,and the bright temperature value in the dust area was significantly higher.After multiple threshold optimiza-tions,the recognition effect of sand and dust weather is getting better and better,especially for large-scale sand and dust weather,and the recognition results are consistent with the observation reality.The multi-channel threshold method has a good effect on the identification of sand and dust weather and can be used for the identification of sand and dust areas.
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