Sand dust-storm monitoring method based on ground surface emissivity database

Abstract

The invention discloses a sand dust-storm monitoring method based on a ground surface emissivity database. In the traditional sand dust-storm monitoring method, the spectral characteristics differencebetween sand and other ground objects is utilized and a fixed threshold value is set to realize sand and dust information identification. The method comprises the steps of synthesizing a lunar groundsurface emissivity database by using a minimum value method; simulating a maximum apparent reflectance threshold value of a clear sky pixel under different atmospheric parameters through 6S (Second Simulation of the Satellite Signal in the Solar Spectrum); if a light reflectance of a satellite remote sensing data table is greater than a simulated apparent reflectance, judging the pixel as a sanddust pixel to achieve monitoring of the sand dust-storm with a dynamic threshold method. Through analysis and comparison of the verification results, the extraction range of sand and dust and the sandand dust area of the true color image are consistent; the sand and dust weather at 96.8% of surface observation stations is the same as the monitoring results, and OMI AI data are basically the sameas the sand and dust monitoring results. The verification results show that the influence of factors such as mixed pixels and atmospheric environment is reduced and sand and dust storm monitoring withhigher accuracy can be achieved by using the method.

Description

technical field [0001] The invention belongs to the field of environmental research, and more specifically relates to a sandstorm monitoring method based on a surface reflectivity library. Background technique [0002] Sandstorm is a general term for both sandstorm and duststorm. It refers to a situation where a large amount of sand and dust on the ground is blown up by strong winds and drawn into the air, making the air particularly turbid and the horizontal visibility less than 1,000 meters. Severe wind and sand weather phenomenon. Sandstorm is a regional severe disaster weather phenomenon, which is extremely destructive to the ecosystem. It can accelerate land desertification, cause serious pollution to the atmospheric environment, and significantly reduce air quality. It is harmful to human health, agricultural production, transportation, Negative impacts such as communication, etc. can also supplement the ocean with nutrients such as iron and nitrogen through the depos...

AI Technical Summary

Problems solved by technology

In-depth research has been carried out in the fields of aerosol, atmospheric correction, cloud detection, etc., and it has better solved the problems of mixed pixels and complex atmospheric environment that plague remote sensing monitoring

Images