A cross-radiation calibration method for hyperspectral sensors based on multispectral sensors

Abstract

The invention discloses a cross radiometric calibration method of a hyper-spectral sensor based on a multi-spectral sensor. The method is used for solving the cross radiometric calibration problem of the hyper-spectral sensor without a matched reference hyper-spectral image. The method comprises the following steps of: selecting cloudless hyper-spectral image data; selecting a multi-spectral reference image according to the hyper-spectral data; selecting a uniform ground object on the image as an interesting region; performing geometric precise correction of the two images; calculating entrance pupil radiances of various types of wave bands of the two sensors by using an atmospheric radiation transmission model; solving spectrum matching factors of various types of corresponding wave bands according to a certain rule; solving the entrance pupil radiances of the various types of wave bands of the hyper-spectral sensor by using the spectrum matching factors and the multi-spectral data; and linearly fitting pixel DN (Digital Number) values in the interesting region of the hyper-spectral image to be calibrated and the radiances of corresponding pixels of the multi-spectral reference image after being corrected through the spectrum matching factors to obtain calibration coefficients of the various types of wave bands of the hyper-spectral sensor. The method has the advantages of good stability, high reliability, high precision and the like.

Description

(1) Technical field [0001] The invention relates to a cross-radiation calibration method for a hyperspectral sensor based on a multispectral sensor, which belongs to the field of remote sensing data processing methods and application technologies, and is suitable for the theoretical method and application technology research of hyperspectral sensor radiation calibration. (2) Background technology [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 ...

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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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