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Remote Sens. 2014, 6(12), 12427-12446; doi:10.3390/rs61212427

The S-NPP VIIRS Day-Night Band On-Orbit Calibration/Characterization and Current State of SDR Products

1
Earth Resource Technology Inc., 14401 Sweitzer Lane, Laurel, MD 20707, USA
2
Sigma Space Corporation, 4600 Forbes Blvd., Lanham, MD 20706, USA
3
NASA Goddard Space Flight Center, Greenbelt, MD 20661, USA
*
Author to whom correspondence should be addressed.
Received: 1 October 2014 / Revised: 4 December 2014 / Accepted: 5 December 2014 / Published: 10 December 2014
(This article belongs to the Special Issue Remote Sensing with Nighttime Lights)
View Full-Text   |   Download PDF [3892 KB, uploaded 10 December 2014]   |  

Abstract

The launch of VIIRS on-board the Suomi-National Polar-orbiting Partnership (S-NPP) on 28 October 2011, marked the beginning of the next chapter on nighttime lights observation started by the Defense Meteorological Satellite Program’s (DMSP) OLS sensor more than two decades ago. The VIIRS observes the nighttime lights on Earth through its day-night band (DNB), a panchromatic channel covering the wavelengths from 500 nm to 900 nm. Compared to its predecessors, the VIIRS DNB has a much improved spatial/temporal resolution, radiometric sensitivity and, more importantly, continuous calibration using on-board calibrators (OBCs). In this paper, we describe the current state of the NASA calibration and characterization methodology used in supporting mission data quality assurance and producing consistent mission-wide sensor data records (SDRs) through NASA’s Land Product Evaluation and Analysis Tool Element (Land PEATE). The NASA calibration method utilizes the OBCs to determine gains, offset drift and sign-to-noise ratio (SNR) over the entire mission. In gain determination, the time-dependent relative spectral response (RSR) is used to correct the optical throughput change over time. A deep space view acquired during an S-NPP pitch maneuver is used to compute the airglow free dark offset for DNB’s high gain stage. The DNB stray light is estimated each month from new-moon dark Earth surface observations to remove the excessive stray light over the day-night terminators. As the VIIRS DNB on-orbit calibration is the first of its kind, the evolution of the calibration methodology is evident when the S-NPP VIIRS’s official calibrations are compared with our latest mission-wide reprocessing. In the future, the DNB calibration methodology is likely to continue evolving, and the mission-wide reprocessing is a key to providing consistently calibrated DNB SDRs for the user community. In the meantime, the NASA Land PEATE provides an alternative source to obtain mission-wide DNB SDR products that are calibrated based on the latest NASA DNB calibration methodology. View Full-Text
Keywords: remote sensing; nighttime lights; day-night band; Vis/NIR; VIIRS; on-orbit calibration; Solar Diffuser; stray light; noise; SNR remote sensing; nighttime lights; day-night band; Vis/NIR; VIIRS; on-orbit calibration; Solar Diffuser; stray light; noise; SNR
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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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MDPI and ACS Style

Lee, S.; Chiang, K.; Xiong, X.; Sun, C.; Anderson, S. The S-NPP VIIRS Day-Night Band On-Orbit Calibration/Characterization and Current State of SDR Products. Remote Sens. 2014, 6, 12427-12446.

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