Atmospheric correction method and system for hyperspectral remote sensing image

Abstract

The invention discloses an atmospheric correction method and system for a hyperspectral remote sensing image. The method comprises steps as follows: step one, surface reflectance and observation apparent reflectance of a blue waveband and a red waveband of a dark object are acquired according to satellite signals; step two, an aerosol mode is inversed based on the satellite signals; step three, moisture content is inversed based on the satellite signals and the current atmospheric aerosol mode; and step four, the remote sensing image is subjected to atmospheric correction according to the current atmospheric aerosol mode and the current moisture content obtained through inversion. Matched aerosol modes are established according to characteristics of different areas, and the aerosol mode is inversed firstly before atmospheric correction, so that the accuracy of atmospheric correction is improved; mutual influence of moisture content and aerosol is comprehensively considered, the aerosol optical thickness and the moisture content are subjected to synergic inversion, and mutual influence of the aerosol optical thickness and the moisture content can be further eliminated.

Description

technical field [0001] The invention belongs to the technical field of atmospheric environment remote sensing, and in particular relates to a hyperspectral remote sensing image atmospheric correction method and system, which are suitable for the Hyperion sensor of the EO-1 satellite. Background technique [0002] Aerosol and water vapor in the atmosphere are one of the important factors affecting the quality of aerial and aerospace remote sensing image data [1-4] , the purpose of atmospheric correction is to eliminate the influence of various components in the atmosphere on remote sensing signals and restore the real surface radiation information. Atmospheric conditions are changing rapidly, and it is difficult to measure atmospheric parameters synchronously when satellites pass by. If atmospheric information can be directly retrieved from remote sensing information, atmospheric correction can be performed better. Atmospheric O 3 , O 2 , CO 2 , NO 2 、CH 4 The content o...

AI Technical Summary

Problems solved by technology

However, at this stage, the atmospheric correction algorithm based on the atmospheric radiative transfer model inverts the aerosol and water vapor contents separately

Generally, the water vapor content is estimated by using the water vapor absorption band first, and then the aerosol inversion is considered after eliminating the influence of water vapor; and when considering the influence of aerosol, it is assumed that the aerosol is a single model, and the difference of the aerosol model is not considered

But in practice, the aerosol type or mode changes, and the choice of aerosol mode is the biggest source of error

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