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Open AccessArticle

In-Flight Radiometric Calibration of Compact Infrared Camera (CIRC) Instruments Onboard ALOS-2 Satellite and International Space Station

1
Department of Computer and Information Sciences, Ibaraki University, Hitachi, Ibaraki 3168511, Japan
2
Japan Aerospace Exploration Agency (JAXA), Tsukuba, Ibaraki 3058505, Japan
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(1), 58; https://doi.org/10.3390/rs12010058
Received: 27 November 2019 / Revised: 18 December 2019 / Accepted: 19 December 2019 / Published: 22 December 2019
(This article belongs to the Special Issue Cross-Calibration and Interoperability of Remote Sensing Instruments)
The Compact Infrared Camera (CIRC) instruments onboard the Advanced Land Observing Satellite-2 (ALOS-2) and the Calorimetric Electron Telescope (CALET) attached to the International Space Station are satellite-borne 2D-array thermal infrared cameras for technical demonstrations in fields such as forest fire monitoring, volcano monitoring, and heat island analysis. Since they have the characteristics of low cost and low power consumption and have no onboard calibrator such as a blackbody or shutter, in-flight calibration should be performed by vicarious calibration (VC) and cross-calibration (CC). In this study, we determined the recalibration coefficients for both of the CIRC instruments as a function of time based on VC experiments in Lake Kasumigaura (Japan) and Railroad Valley Playa (USA), VC with telemetry data from three lakes in Japan and the USA, and CC with imagers onboard two geostationary satellites (MTSAT-2 and Himawari-8). As a result, the derived recalibration coefficients improved the accuracy of the ground-testing-based radiance remarkably in both of the CIRC instruments, suggesting that the recalibrated radiance can satisfy the target accuracy of CIRC, given as 2 K at 300 K. These coefficients, as a function of time, will be applied to all CIRC images by reprocessing planned in the near future. View Full-Text
Keywords: vicarious calibration; intercalibration; at-sensor radiance; surface temperature; surface emissivity; in-situ measurement; telemetry; MTSAT-2; Himawari-8 vicarious calibration; intercalibration; at-sensor radiance; surface temperature; surface emissivity; in-situ measurement; telemetry; MTSAT-2; Himawari-8
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MDPI and ACS Style

Tonooka, H.; Sakai, M.; Kumeta, A.; Nakau, K. In-Flight Radiometric Calibration of Compact Infrared Camera (CIRC) Instruments Onboard ALOS-2 Satellite and International Space Station. Remote Sens. 2020, 12, 58.

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