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Open AccessArticle

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

1
NASA Langley Research Center, Hampton, VA 23666, USA
2
Science Systems and Applications, Inc. 1 Enterprise Pkwy, Hampton, VA 23666, USA
3
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
4
Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(22), 2717; https://doi.org/10.3390/rs11222717
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.

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