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Visible Infrared Imaging Radiometer Suite (VIIRS)

The Visible Infrared Imaging Radiometer Suite (VIIRS) is one of the key instruments onboard the Suomi National Polar-Orbiting Partnership (Suomi NPP) spacecraft, which was successfully launched on October 28, 2011. The VIIRS nadir door was opened on November 21, 2011, which enables a new generation of operational moderate resolution-imaging capabilities following the legacy of the AVHRR on NOAA and MODIS on Terra and Aqua satellites. The VIIRS empowers 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 more than twenty environmental data records including clouds, sea surface temperature, ocean color, polar wind, vegetation fraction, aerosol, fire, snow and ice, vegetation, , and other applications. Results from the on-orbit verification in the postlaunch check-out and intensive calibration and validation have shown that VIIRS is performing very well.

Metadata,
Documents and news
VIIRS Performance and Monitoring Data and Software
News VIIRS Event Log Database VIIRS Image Gallery
Publication Database SNPP SNOs with Other Satellites VIIRS data on CLASS
VIIRS Users Guide SNPP Daily Orbit Predictions VIIRS data on ftp site (90 days)
VIIRS data for beginners Cal/Val Site Overpass Predictions VIIRS data on Landpeate
VIIRS Calibration ATBD Validation Site Time Series at 30+ sites Data on GRAVITE
Conference Presentations VIIRS Geolocation Validation VIIRS Software Tools
VIIRS Novel Applications Radiometric Intercomparison with MODIS Planck Calculator for Infrared Remote Sensing
VIIRS SDR Data Format VIIRS Longterm Monitoring at ICVS Current IDPS LUTs
VIIRS SDR Meetings VIIRS On-orbit Performance Table Reprocessing LUTs
VIIRS FAQ Standardized Calibration Parameters Proposed water vapor band and I3/M10 trade study
About VIIRS VIIRS Spectral Response Functions J1 VIIRS DNB GEO code change test data
(RDR only)
VIIRS special issue
in Remote Sensing
VIIRS Line Spread Function along scan Standard Radiometric Test Scenes

Lunar Calendar for DNB

Moon in Space View Events Database Test

Mission Notice (for related events, please see event log database in the table above):

05/01/2014: On May 1 2014, Suomi-NPP will be designated as the primary afternoon orbit satellite for supporting NOAA's environmental monitoring mission. This designation is used mainly for managing and prioritizing mission resources that share common services. NOAA-19 will serve as the Prime Services Mission to continue supporting SARSAT and A-DCS services. Observational data from NOAA-19’s suite of instruments (AVHRR, AMSU-A, HIRS, MHS, SEM and SBUV) will likewise be collected, processed and distributed to users. In the interim, NOAA will continue evolving our data delivery infrastructure capacity in the near future to better serve the wider community since new mission satellites like Suomi-NPP are capable of generating large data volumes - up to 3.9 TB per day.

As the primary afternoon orbit satellite, Suomi-NPP will continue its shared mission objectives of supporting NOAA's operational missions, providing science data continuity for NASA's EOS missions and serving as risk reduction for the Joint Polar Satellite System (JPSS) follow-on mission.

05/01/2014: After extensive studies of both postlaunch and prelaunch calibration data, the VIIRS SDR team has concluded that some of the calibration coefficients for the VIIRS RSB bands need to be adjusted (aka c0=0) to improve the calibration consistency. This change was approved by the AERB in early April and is now ready to be implemented. Specifically, the new "Delta-C-LUT" will be delivered to ops this week and should go into effect Thursday (5/1/14) evening.

What you should expect to see?

The calibrated radiance/reflectance in the VIIRS SDR RSB bands are expected to change by a fraction of a percent in most cases (larger at low radiances but not to exceed 2% in all cases).

This change should reflect an improvement in the calibration consistency/accuracy.

If you observe larger than expected changes, or if you need more information, please contact members of the VIIRS SDR team. More details about this change can also be found in the CCR-14-1631/1698, or DR7413/DR7622.

04/10/2013: The modulated VIIRS RSRs that capture changes in RSR shape due to the RTA throughput degradation anomaly as of 1 February 2013 went into operations on 4 April 2013, in an updated version of VIIRS-SDR-RSR-LUT.

12/11/2012: Wolfe et al., Suomi NPP VIIRS Geolocation Products Degradation Late November to Early December 2012. (click here)

VIIRS paper:

Cao, C., F. DeLuccia, X. Xiong, R. Wolfe, F. Weng, Early On-orbit Performance of the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (S-NPP) Satellite, IEEE Trans. on Geosci. and Remote Sens., Volume: 52 , Issue: 2, Digital Object Identifier: 10.1109/TGRS.2013.2247768, Publication Year: 2014 , Page(s): 1142 - 1156. (click here)

Cao, C., X. Shao, X. Xiong, S. Blonski, Q. Liu, S. Uprety, X. Shao, Y. Bai, F. Weng, Suomi NPP VIIRS sensor data record verification, validation, and long-term performance monitoring, Journal of Geophysical Research: Atmospheres, DOI: 10.1002/2013JD020418, 2013. (click here)

Uprety, S., C. Cao, X. Xiong, S. Blonski, A. Wu, and X. Shao, 2013, Radiometric Inter-comparison between Suomi NPP VIIRS and Aqua MODIS Reflective Solar Bands using Simultaneous Nadir Overpass in the Low Latitudes, JTech, doi: http://dx.doi.org/10.1175/JTECH-D-13-00071.1.

For questions and comments, please contact yan.bai@noaa.gov.