Remote sensor radiometric calibration method based on hyperspectral data and calibration system

A hyperspectral remote sensing and radiation calibration technology, which is applied in the field of remote sensor radiation calibration methods and calibration systems, can solve problems such as different processing methods and inability to meet cross-calibration requirements for visible spectrum segments
CN108955883AActive Publication Date: 2018-12-07NAT SATELLITE METEOROLOGICAL CENT
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NAT SATELLITE METEOROLOGICAL CENT
Publication Date
2018-12-07

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Abstract

The invention provides a remote sensor radiometric calibration method based on hyperspectral data and a calibration system. The method comprises the steps of collecting hyperspectral remote sensing data in real time through a hyperspectral remote sensor serving as a reference remote sensor, collecting the imager channel reflectivity in real time through a channel imager serving as a remote sensorto be calibrated, and converting the hyperspectral remote sensing data into imager channel simulated reflectivity; establishing a projection area by taking the interaction of running orbits of the reference remote sensor and the remote sensor to be calibrated as a center and taking the sub-satellite point resolution as an interval; and projecting the imager channel simulated reflectivity and the imager channel reflectivity to the projection area, extracting effective cross-calibration data pairs for pixels of the hyperspectral remote sensing data, and calculating the radiometric calibration coefficient of the remote sensor to be calibrated according to the effective cross-calibration data pairs so as to correct the imager channel reflectivity collected by the remote sensor to be calibratedin real time.
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Description

technical field

[0001] The invention relates to the technical field of on-orbit radiation calibration of remote sensors, in particular to a remote sensor radiation calibration method and calibration system based on hyperspectral data. Background technique

[0002] High-precision radiometric calibration of remote sensing data is an important prerequisite for its quantitative application. The radiometric calibration of the visible-near-infrared band imager is generally preferred to be equipped with an on-board calibration device to complete the calibration. However, for remote sensors that are not equipped with an on-board absolute radiation calibration device, it is often necessary to use an alternative calibration method to complete the radiation calibration work during its working life. The cross-calibration method (Simultaneously Nadir Observe, SNO) based on the observation data of the sub-satellite point is currently a relatively common method for on-orbit radiometric ca...

Claims

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