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Inter-Calibration of the OSIRIS-REx NavCams with Earth-Viewing Imagers

NASA Langley Research Center, Hampton, VA 23666, USA
Science Systems and Applications, Inc. 1 Enterprise Pkwy, Hampton, VA 23666, USA
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(22), 2717;
Received: 21 October 2019 / Revised: 12 November 2019 / Accepted: 12 November 2019 / Published: 19 November 2019
(This article belongs to the Special Issue Remote Sensing: 10th Anniversary)
The Earth-viewed images acquired by the space probe OSIRIS-REx during its Earth gravity assist flyby maneuver on 22 September 2017 provided an opportunity to radiometrically calibrate the onboard NavCam imagers. Spatially-, temporally-, and angularly-matched radiances from the Earth viewing GOES-15 and DSCOVR-EPIC imagers were used as references for deriving the calibration gain of the NavCam sensors. An optimized all-sky tropical ocean ray-matching (ATO-RM) calibration approach that accounts for the spectral band differences, navigation errors, and angular geometry differences between NavCam and the reference imagers is formulated in this paper. Prior to ray-matching, the GOES-15 and EPIC pixel level radiances were mapped into the NavCam field of view. The NavCam 1 ATO-RM gain is found to be 9.874 × 10−2 Wm−2sr−1µm−1DN−1 with an uncertainty of 3.7%. The ATO-RM approach predicted an offset of 164, which is close to the true space DN of 170. The pre-launch NavCam 1 and 2 gains were compared with the ATO-RM gain and were found to be within 2.1% and 2.8%, respectively, suggesting that sensor performance is stable in space. The ATO-RM calibration was found to be consistent within 3.9% over a factor of ±2 NavCam 2 exposure times. This approach can easily be adapted to inter-calibrate other space probe cameras given the current constellation of geostationary imagers. View Full-Text
Keywords: calibration; OSIRIS-REx; NavCam; ray-matching; SBAF; GOES-15; DSCOVR-EPIC calibration; OSIRIS-REx; NavCam; ray-matching; SBAF; GOES-15; DSCOVR-EPIC
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MDPI and ACS Style

Doelling, D.; Khlopenkov, K.; Haney, C.; Bhatt, R.; Bos, B.; Scarino, B.; Gopalan, A.; Lauretta, D.S. Inter-Calibration of the OSIRIS-REx NavCams with Earth-Viewing Imagers. Remote Sens. 2019, 11, 2717.

AMA Style

Doelling D, Khlopenkov K, Haney C, Bhatt R, Bos B, Scarino B, Gopalan A, Lauretta DS. Inter-Calibration of the OSIRIS-REx NavCams with Earth-Viewing Imagers. Remote Sensing. 2019; 11(22):2717.

Chicago/Turabian Style

Doelling, David, Konstantin Khlopenkov, Conor Haney, Rajendra Bhatt, Brent Bos, Benjamin Scarino, Arun Gopalan, and Dante S. Lauretta 2019. "Inter-Calibration of the OSIRIS-REx NavCams with Earth-Viewing Imagers" Remote Sensing 11, no. 22: 2717.

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