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A New Method for Characterizing NOAA-20/S-NPP VIIRS Thermal Emissive Bands Response Versus Scan Using On-Orbit Pitch Maneuver Data

1
Global Science and Technology (GST), Inc., Greenbelt, MD 20770, USA
2
NOAA/Center for Satellite Applications and Research, College Park, MD 20740, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(13), 1624; https://doi.org/10.3390/rs11131624
Received: 30 May 2019 / Revised: 5 July 2019 / Accepted: 7 July 2019 / Published: 9 July 2019
(This article belongs to the Collection Visible Infrared Imaging Radiometers and Applications)
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Abstract

The on-orbit calibration of Visible Infrared Imaging Radiometer Suite (VIIRS) Thermal Emissive Bands (TEB), onboard the National Oceanic and Atmospheric Administration-20 (NOAA-20) and the Suomi National Polar-orbiting Partnership (S-NPP) satellites, have been stable during nominal operations. However, larger than expected scan angle/scene temperature dependent biases, relative to the co-located Cross-track Infrared Sounder (CrIS) observations, were observed in the NOAA-20 longwave infrared (LWIR) bands. The Response Versus Scan (RVS) effect—the variation of instrument reflectance of source radiance with scan angle, is a significant contributor to VIIRS calibration. TEB RVS is characterized using prelaunch test data and verified on-orbit using pitch maneuver data. This study presents a new method that characterizes VIIRS on-orbit TEB RVS at both Earth View (EV) and Space View (SV) scan angles simultaneously. This method was compared with an existing on-orbit RVS method (the Wu et al. method), which derives RVS at EV scan angles using pitch maneuver data and extrapolates SV RVS from EV. The new method derived on-orbit RVS differ from prelaunch values up to 1.0% at the beginning of scan in the NOAA-20 LWIR bands, and ~0.5% in S-NPP M15. VIIRS–CrIS inter-comparison results indicates that the new method derived on-orbit RVS can effectively minimize LWIR scan angle/scene temperature dependent biases, with scan averaged biases reduced from 0.40K to 0.15K for NOAA-20 LWIR bands, and from 0.24K to 0.08K for S-NPP M15. The Wu et al. method can also reduce the scan angle dependent biases, but at the expense of increasing the scene temperature dependent biases. View Full-Text
Keywords: Visible Infrared Imaging Radiometer Suite (VIIRS); NOAA-20; S-NPP; Thermal Emissive Bands (TEB); Response Versus Scan (RVS); on-orbit pitch maneuver; prelaunch; scan angle/scene temperature dependent biases Visible Infrared Imaging Radiometer Suite (VIIRS); NOAA-20; S-NPP; Thermal Emissive Bands (TEB); Response Versus Scan (RVS); on-orbit pitch maneuver; prelaunch; scan angle/scene temperature dependent biases
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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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Wang, W.; Cao, C.; Blonski, S. A New Method for Characterizing NOAA-20/S-NPP VIIRS Thermal Emissive Bands Response Versus Scan Using On-Orbit Pitch Maneuver Data. Remote Sens. 2019, 11, 1624.

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