Early March 18, VIIRS Nightfire has detections near reported location from SNPP and NOAA-20
Detection result from the two VIIRS instruments 50 minutes apart
More details about detections from the two VIIRS instruments
In 2012, the Earth Observation Group developed the VIIRS Nightfire (VNF) data product. VNF is the only daily global fire product with temperature, source size and radiant heat calculations from physical laws. These calculations are made possible by taking a multispectral approach, with detections possible in the near-infrared (NIR), shortwave infrared (SWIR) and mid-wave infrared (MWIR). With detections spanning three spectral ranges, VNF uses Planck curve fitting to define the radiance profile of sub-pixel IR emitters. The wavelength with peak radiance sets the temperature using Wien’s Displacement Law. The source size is calculated based of the gray body emissivity multiplied by the pixel footprint. The radiant heat is calculated with the Stefan-Boltzmann Law.
In this example we look at VNF detection of a massive petrochemical blaze at the Intercontinental Terminals Company, outside of Houston, Texas. The blaze started during on March 17, 2019 and continued into through the night. The blaze was detected by both the VIIRS instruments collecting currently, from the SNPP and NOAA-20 satellites.
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