System and method for atmosphere correction suitable for airborne thermal infrared imaging spectrometer

Abstract

The invention discloses a system and a method for atmosphere correction suitable for an airborne thermal infrared imaging spectrometer. The method comprises the following steps of enabling the systemand the airborne imaging spectrometer to synchronously measure the atmosphere downward thermal infrared radiation at aircraft height; then, utilizing MODITRAN to generate atmosphere downward thermal infrared radiation, atmosphere path radiation and atmosphere permeability under different atmosphere conditions, and establishing a reference database; searching an atmosphere downward thermal infraredradiation spectrum which is most matched with a measuring result of the system from the reference database, and finding the corresponding atmosphere path radiation, ground surface downward thermal infrared radiation and atmosphere permeability; finally, on the basis of time, calculating an off-ground radiation spectrum from thermal infrared hyper-spectrum data obtained by the imaging spectrometerafter radiation calibration by pixels according to a radiation transfer equation, so as to realize the atmosphere correction of the thermal infrared imaging spectrometer. The system and the method for the atmosphere correction have the advantages that the real-time atmosphere downward thermal infrared radiation information can be obtained, and the accuracy of atmosphere correction of airborne thermal infrared hyper-spectrum data is greatly improved.

Description

technical field [0001] The invention relates to the technical field of earth observation, in particular to an atmospheric correction system and method suitable for an airborne thermal infrared imaging spectrometer. Background technique [0002] Thermal radiation is the most widespread radiation that exists in nature, and it enables researchers to clearly observe the surface conditions on dark nights. Taking advantage of the characteristic of thermal radiation, thermal infrared remote sensing has the ability to observe the earth all day long. Hyperspectral remote sensing has the characteristics of nanoscale high spectral resolution and "map-spectrum integration". While imaging ground objects, each pixel in the hyperspectral image obtains tens or even hundreds of nanometer-scale continuous spectral information, so that the image has spatial, radiation and spectral information at the same time. Combining the detection capabilities of the thermal infrared band and the advantag...

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Problems solved by technology

AAC method will have one value and multiple solutions

In addition, for cloudy weather, these methods are basically ineffective due to the inability to accurately estimate cloud amount, cloud thickness, etc.

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