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

A radiometric calibration and optimization algorithm technology, applied in the field of radiometric calibration of hyperspectral sensors, can solve problems such as difficulty in finding hyperspectral images, achieve the effects of expanding the selection range, enhancing usability, and reducing uncertainty

Inactive Publication Date: 2012-07-04
BEIHANG UNIV
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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/Hy...

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

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[0038] In order to better illustrate the method for cross-calibrating hyperspectral data using multispectral images involved in the present invention, Hyperion hyperspectral data and TM multispectral image data are used for cross-radiometric calibration. The present invention is an optimization algorithm-based hyperspectral sensor cross-radiation calibration method, and the specific implementation steps are as follows:

[0039] (1) Reading in hyperspectral data: reading in Hyperion hyperspectral image data in Dunhuang area;

[0040] (2) Select radiometrically calibrated multispectral TM data whose imaging time is close to that of the Hyperion image data and the target is the same;

[0041] (3) Perform geometric fine correction on the two groups of images;

[0042] (4) In order to minimize the error in the subsequent optimization interpolation link, and considering that all gas characteristic absorption valleys on the radiance curve are determined by the physical characteristi...

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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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Application Information

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IPC IPC(8): G01S7/497
Inventor 周冠华赵慧洁贾斐姜禾徐武健
Owner BEIHANG UNIV
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