Inter-Calibration of the OSIRIS-REx NavCams with Earth-Viewing Imagers
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Final Published Version
Author
Doelling, DavidKhlopenkov, Konstantin
Haney, Conor
Bhatt, Rajendra
Bos, Brent
Scarino, Benjamin
Gopalan, Arun
Lauretta, Dante S.
Affiliation
Univ Arizona, Lunar & Planetary LabIssue Date
2019-11-19
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MDPICitation
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.Journal
REMOTE SENSINGRights
Copyright © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
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 x 10(-2) Wm(-2)sr(-1)mu m(-1)DN(-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.Note
Open access journalISSN
2072-4292Version
Final published versionSponsors
National Aeronautics & Space Administration (NASA) [NNM10AA11C]ae974a485f413a2113503eed53cd6c53
10.3390/rs11222717