Post calibration of channel 1 of NOAA-14 AVHRR: Implications on aerosol optical depth retrieval

Li, Chi, Xue, Yong, Liu, Quanhua, Guang, Jie, Di, Aojie and She, Lu (2014) Post calibration of channel 1 of NOAA-14 AVHRR: Implications on aerosol optical depth retrieval. In: 2014 IEEE Geoscience and Remote Sensing Symposium, 13-18 July 2014, Quebec City, Canada.

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Official URL: https://ieeexplore.ieee.org/document/6946728

Abstract / Description

In order to produce long-term aerosol optical depth (AOD) dataset over land from the Advanced Very High Resolution Radiometer (AVHRR), AVHRR data quality in terms of radiometric calibration must be maintained. A vicarious calibration method have been developed by incorporating well calibrated Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) radiance data over several pseudo-invariant targets to inter-calibrate the channel 1 of AVHRR based on Bidirectional Reflectance Distribution Functions (BRDFs) and spectral band adjustment factor (SBAF) models for different targets. Comparison of our calibration coefficients with those of Pathfinder Atmospheres Extended (PATMOS-x) indicate the calibration accuracy to be within 2.5%. The operational L1B and recalibrated AVHRR radiance are applied to derive AOD maps over East America (dark surface) and West Africa (bright surface) using the land aerosol and bidirectional reflectance inversion by times series technique (LABITS) algorithm. Preliminary comparisons show that significant difference in the retrieved AOD from the two different calibration is expected, while the spatial distribution of AOD difference is
complicated due to different surface brightness and deficiencies of numeric solutions.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: AOD, AVHRR, radiometric calibration
Subjects: 000 Computer science, information & general works
Department: School of Computing and Digital Media
Depositing User: Bal Virdee
Date Deposited: 25 Feb 2019 09:49
Last Modified: 25 Feb 2019 09:49
URI: http://repository.londonmet.ac.uk/id/eprint/4674

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