Cross radiation calibration method based on optimization algorithm of hyper-spectral sensor

Abstract

The invention relates to a cross radiation calibration method based on the optimization algorithm of a hyper-spectral sensor; the cross radiation calibration method comprises the following steps of: (1) selecting an image to be calibrated; (2) selecting a reference image; (3) cutting out a region covered jointly by the two images, and selecting a uniform ground object to be used as a cross calibration interesting region; (4) working out the entrance pupil radiant brightness of the two sensors in each waveband and a gas absorbing characteristic curve, and removing gas absorption characteristics; (5) screening out the optimal wave band and the optimal interpolation scheme; (6) carrying out the cross radiation calibration on the optimal wave band of the hyper-spectral sensor; (7) interpolating the radiant brightness of the calibrated hyper-spectral waveband, reconstructing a hyper-spectral curve, loading the gas absorption characteristics to serve as the radiant brightness of the reference sensor; and (8) realizing the cross radiation calibration on the hyper-spectral sensor by using a multispectral sensor. The cross radiation calibration method can realize the in-orbit cross radiation calibration of a space-borne imaging spectrometer and has business popularization prospect.

Description

technical field [0001] The invention relates to a hyperspectral sensor cross-radiation calibration method based on an optimization algorithm, belongs to the field of remote sensing data processing methods and application technologies, and is suitable for research on theoretical methods and application technologies of hyperspectral sensor radiation calibration. Background technique [0002] Radiometric calibration of remote sensors is a prerequisite for the quantitative application of remote sensing data. The development of this type of technology can greatly promote the application depth of remote sensing data and expand the application breadth of remote sensing data. As an important part of satellite remote sensing data preprocessing technology, radiometric calibration aims to establish the relationship between the radiance at the entrance pupil of the remote sensor of the sensor and the digital count value (DN value) output, so as to determine the output of the remote senso...

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Problems solved by technology

However, most of the existing research is based on radiometric calibration between multispectral sensors, and currently there are very few spaceborne hyperspectral sensors in orbit, only EO1 / Hyperion in the United States, PROBA / CHRIS in ESA, and HJ / Hyperion in China. HIS and a few

Due to the availability of hyperspectral data, access time, spatial coverage, weather conditions, differences in spatial resolution and many other factors, it is often difficult to find two sets of matching hyperspectral images

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