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Remote Sens. 2017, 9(12), 1300;

Pre-Launch JPSS-2 VIIRS Response versus Scan Angle Characterization

Science Systems and Applications, Inc., Lanham, MD 20706, USA
The Aerospace Corporation, El Segundo, CA 90245, USA
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 4 December 2017 / Accepted: 8 December 2017 / Published: 12 December 2017
(This article belongs to the Collection Visible Infrared Imaging Radiometers and Applications)
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On-orbit whisk-broom sensors have scanning mirror assemblies, whose reflectance variations with scan angle must be characterized prior to launch. One such instrument is the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Joint Polar Satellite System 2 (JPSS-2) platform. The scanning optics inside VIIRS includes a four mirror rotating telescope assembly (RTA) and a half angle mirror (HAM), rotating at half the speed of the RTA, which de-rotates the light before it enters the aft-optics assembly. The angle of incidence (AOI) on the HAM varies with scan angle; all of the other optical components in VIIRS have a fixed AOI with scan angle. In general, the reflectance of the HAM will vary with AOI. This parameter is difficult to quantify once in orbit and therefore must be characterized pre-launch. Ground measurements were performed in the summer of 2016 to determine the relative reflectance change of the instrument with scan angle, referred to as the response versus scan angle (RVS). This work will describe the RVS testing performed and the results obtained, including an atmospheric water vapor correction and an uncertainty analysis. Results indicate that the reflectance variation with scan angle is small for spectral bands between 0.4 μ m and 4 μ m (less than 2% over the full range of AOI); in contrast, the reflectance variation is between 3% and 10% for the spectral bands in the 8 μ m to 12 μ m range. Uncertainties are below 0.05% in the reflective solar spectral region and below 0.26% in the thermal emissive spectral region. Comparisons to previous VIIRS builds (on the SNPP and JPSS-1 satellites) show comparable performance. View Full-Text
Keywords: JPSS; VIIRS; calibration; pre-launch; thermal emissive; reflective solar; RVS JPSS; VIIRS; calibration; pre-launch; thermal emissive; reflective solar; RVS

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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McIntire, J.; Moyer, D.; Chang, T.; Oudrari, H.; Xiong, X. Pre-Launch JPSS-2 VIIRS Response versus Scan Angle Characterization. Remote Sens. 2017, 9, 1300.

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