VIIRS thermal emissive bands calibration algorithm and on-orbit performance

Moyer, David; McIntire, Jeff; Luccia, Frank De; Efremova, Boryana; Chiang, K.; Xiong, X.

doi:10.1117/12.930145

Cited by 8 publications

(6 citation statements)

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“…In particular, the BB temperature varies with the orbital cycle with an amplitude of about 25 mK (highest during daytime and lowest at night); Figure 4a plots the average BB temperature over approximately two orbits. This behavior has been reported earlier in the mission [19,33] and has continued to the present. The orbital cycle of the six individual thermistors shows that Thermistors 3 and 6 (the thermistors farthest from the EV port) are driving the average BB temperature variation; the likely cause of these variations is heating of one side of the BB due to Earth illumination.…”

Section: Teb Performancesupporting

confidence: 86%

Assessment of S-NPP VIIRS On-Orbit Radiometric Calibration and Performance

et al. 2016

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The VIIRS instrument on board the S-NPP spacecraft has successfully operated for more than four years since its launch in October 2011. Many VIIRS environmental data records (EDR) have been continuously generated from its sensor data records (SDR) with improved quality, enabling a wide range of applications in support of users in both the operational and research communities. This paper provides a brief review of sensor on-orbit calibration methodologies for both the reflective solar bands (RSB) and the thermal emissive bands (TEB) and an overall assessment of their on-orbit radiometric performance using measurements from instrument on-board calibrators (OBC), as well as regularly scheduled lunar observations. It describes and illustrates changes made and to be made for calibration and data quality improvements. Throughout the mission, all of the OBC have continued to operate and function normally, allowing critical calibration parameters used in the data production systems to be derived and updated. The temperatures of the on-board blackbody (BB) and the cold focal plane assemblies are controlled with excellent stability. Despite large optical throughput degradation discovered shortly after launch in several near-and short-wave infrared spectral bands and strong wavelength-dependent solar diffuser degradation, the VIIRS overall performance has continued to meet its design requirements. Also discussed in this paper are challenging issues identified and efforts to be made to further enhance the sensor calibration and characterization, thereby maintaining or improving data quality.

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Section: Teb Performancesupporting

confidence: 86%

Assessment of S-NPP VIIRS On-Orbit Radiometric Calibration and Performance

et al. 2016

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“…The calibration algorithm, based on the measured BB temperature, emissivity, and spaceview, computes the blackbody radiances and relates them to counts to determine the gain [28]- [30]. Variations in background emission from the halfangle mirror, and components in the surround, are taken into account in scan-angle dependent corrections, as shown in the calibration equations [29].…”

Section: ) Viirs Onboard Calibration Systemmentioning

confidence: 99%

Early On-Orbit Performance of the Visible Infrared Imaging Radiometer Suite Onboard the Suomi National Polar-Orbiting Partnership (S-NPP) Satellite

Cao

Luccia

Xiong

et al. 2014

IEEE Trans. Geosci. Remote Sensing

444

257

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The Visible Infrared Imaging Radiometer Suite (VIIRS) is one of the key environmental remote-sensing instruments onboard the Suomi National Polar-Orbiting Partnership spacecraft, which was successfully launched on October 28, 2011 from the Vandenberg Air Force Base, California. Following a series of spacecraft and sensor activation operations, the VIIRS nadir door was opened on November 21, 2011. The first VIIRS image acquired signifies a new generation of operational moderate resolution-imaging capabilities following the legacy of the advanced very high-resolution radiometer series on NOAA satellites and Terra and Aqua Moderate-Resolution Imaging Spectroradiometer for NASA's Earth Observing system. VIIRS provides significant enhancements to the operational environmental monitoring and numerical weather forecasting, with 22 imaging and radiometric bands covering wavelengths from 0.41 to 12.5 microns, providing the sensor data records for 23 environmental data records including aerosol, cloud properties, fire, albedo, snow and ice, vegetation, sea surface temperature, ocean color, and nigh-time visible-light-related applications. Preliminary results from the on-orbit verification in the postlaunch check-out and intensive calibration and validation have shown that VIIRS is performing well and producing high-quality images. This paper provides an overview of the onorbit performance of VIIRS, the calibration/validation (cal/val) activities and methodologies used. It presents an assessment of the sensor initial on-orbit calibration and performance based on the efforts from the VIIRS-SDR team. Known anomalies, issues, and future calibration efforts, including the long-term monitoring, and intercalibration are also discussed.

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“…The MODIS TEB corresponding to VIIRS TEB are listed in the second column of Table 1. The performance of the S-NPP VIIRS TEB bands was addressed in [6] and [7]. The MODIS TEB performance characterization is described in [8].…”

Section: Introductionmentioning

confidence: 99%

Relative spectral response corrected calibration inter-comparison of S-NPP VIIRS and Aqua MODIS thermal emissive bands

Efremova

Xiong

2014

SPIE Proceedings

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The S-NPP Visible Infrared Imaging Radiometer Suite (VIIRS) instrument is built with strong heritage from EOS MODIS, and has very similar thermal emissive bands (TEB) calibration algorithm and on-board calibrating source -a V-grooved blackbody. The calibration of the two instruments can be assessed by comparing the brightness temperatures retrieved from VIIRS and Aqua MODIS simultaneous nadir observations (SNO) from their spectrally matched TEB. However, even though the VIIRS and MODIS bands are similar there are still relative spectral response (RSR) differences and thus some differences in the retrieved brightness temperatures are expected. The differences depend on both the type and the temperature of the observed scene, and contribute to the bias and the scatter of the comparison. In this paper we use S-NPP Cross-track Infrared Sounder (CrIS) data taken simultaneously with the VIIRS data to derive a correction for the slightly different spectral coverage of VIIRS and MODIS TEB bands. An attempt to correct for RSR differences is also made using MODTRAN models, computed with physical parameters appropriate for each scene, and compared to the value derived from actual CrIS spectra. After applying the CrIS-based correction for RSR differences we see an excellent agreement between the VIIRS and Aqua MODIS measurements in the studied band pairs M13-B23, M15-B31, and M16-B32. The agreement is better than the VIIRS uncertainty at cold scenes, and improves with increasing scene temperature up to about 290 K.

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VIIRS thermal emissive bands calibration algorithm and on-orbit performance

Cited by 8 publications

References 0 publications

Assessment of S-NPP VIIRS On-Orbit Radiometric Calibration and Performance

Assessment of S-NPP VIIRS On-Orbit Radiometric Calibration and Performance

Early On-Orbit Performance of the Visible Infrared Imaging Radiometer Suite Onboard the Suomi National Polar-Orbiting Partnership (S-NPP) Satellite

Relative spectral response corrected calibration inter-comparison of S-NPP VIIRS and Aqua MODIS thermal emissive bands

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