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Multi-spectral load site-free cross calibration method based on hyperspectral loads

A multi-spectral and hyperspectral technology, applied in the re-radiation of electromagnetic waves, radio wave measurement systems, and utilization of re-radiation, etc., can solve the problems of on-orbit radiation calibration of measured data in restricted sites

Active Publication Date: 2014-12-24
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the deficiencies of the prior art, provide a multi-spectral load-based multi-spectral load cross-calibration method without a site, and solve the problem that the current on-orbit radiation calibration is limited by the field measured data

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  • Multi-spectral load site-free cross calibration method based on hyperspectral loads
  • Multi-spectral load site-free cross calibration method based on hyperspectral loads
  • Multi-spectral load site-free cross calibration method based on hyperspectral loads

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Embodiment Construction

[0039] The present invention proposes a hyperspectral load-based multi-spectral load cross-calibration method without a site, and the specific flow chart is as follows figure 1 shown. In the following, the method of the present invention will be introduced by taking the HJ-1B / IRS multi-spectral load thermal infrared channel site-free cross-calibration method based on the Aqua / AIRS hyperspectral load as an example.

[0040](1) Obtain the remote sensing images of the Aqua / AIRS hyperspectral payload and the HJ-1B / IRS multispectral payload in the Qinghai Lake test area, and select the same region of interest on the two remote sensing images, which is recorded as the first region of interest ;

[0041] (2) According to the remote sensing image data of the Aqua / AIRS hyperspectral load in the region of interest, the radiance values ​​at the equivalent entrance pupil of each band of the Aqua / AIRS hyperspectral load are obtained, and the calculation formula is:

[0042] L A (λ)=(DN ...

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Abstract

The invention discloses a multi-spectral load site-free cross calibration method based on hyperspectral loads. According to the method, site measured data are replaced by hyperspectral data with the high radiation calibration accuracy, on-track calibration replacement of multi-spectral loads is achieved, the on-track radiation calibration frequency can be effectively increased, a large amount of manpower and a large number of material resources needed by site calibration are saved, and the problem that on-track radiation calibration is limited by the site measured data at present is solved. By means of the multi-spectral load site-free cross calibration method, the hyperspectral loads are introduced into cross calibration, the spectrum matching algorithm is improved, and the method is also suitable for on-track cross calibration of the multi-spectral loads in other wave bands.

Description

technical field [0001] The invention relates to a field-free cross-calibration method for multi-spectrum loads, which belongs to the field of on-orbit radiation calibration of sensors in quantitative remote sensing. Background technique [0002] On-orbit radiation calibration mainly includes on-satellite calibration, field calibration and cross calibration. On-satellite calibration is based on high-precision on-satellite calibration system, with the highest calibration accuracy, which is the mainstream of foreign sensor calibration, represented by MODIS and Landsat series satellites. There is still a big gap in the on-board calibration technology of domestic satellites. The on-orbit calibration of domestic satellites depends on the site calibration due to time-consuming, laborious and other limitations, which restricts the improvement of the frequency and accuracy of on-orbit calibration. [0003] Cross-calibration is one of the hot spots in radiation research at home and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/497
CPCG01S7/497G01S17/89
Inventor 刘李傅俏燕韩启金潘志强王爱春张学文
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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