Fire Light Detection Algorithm Version 2 (FILDA-2) Modified Combustion Efficiency (MCE) User Guide V1.0

This guide is living document describes the Visible Infrared Imaging Radiometer Suite (S-NPP VIIRS) and National Oceanic and Atmospheric Administration (NOAA)-20/Joint Polar Satellite System (JPSS)-1 VIIRS FIre Light Detection Algorithm (FILDA) fire detection products based on that instrument’s 742 m (Day/Night Band, DNB), 750 m (Moderate Resolution Band, M-bands), and 375 m (Imagery Band, I-band) nominal resolution Collection 2 (C2) reprocessed data from the NASA Land Science Investigator Processing System (SIPS).

The NASA LAND-SIPS VIIRS FILDA-2 375 m/750 m fire modified combustion efficiency product was proposed in the year of 2021 following the successful demonstration of the improvement on the fire detection (Polivka et al., 2016) and modified combustion efficiency characterization by adding the visible observation from the Fire Modified Combustion Efficiency Products (Wang et al., 2020). Importantly, spatial mismatch of different observational resolution of VIIRS channels are dedicatedly handled. Consequently, the new application constituted a holistic use of spectral, spatial, and temporal radiances measured by VIIRS for fire detection.

The global benchmark test demonstrates that FILDA-2 can detect approximately 25-30% more smaller and cooler fires than the operational VIIRS Active Fire 375 m I-band algorithm with the added benefit of providing daily global pixel-level characterizations of MCE for nighttime surface fires. Additionally, FILDA-2 reduces angular dependence in FRP estimates and significantly reduces the "bow-tie" (double-counting) effect in fire detection compared to the AF-I product.

FILDA-2 is an experimental advanced fire product that provides fire detection and retrievals of Radiative Power (FRP), fire Visible Energy Fraction (VEF), and Modified Combustion Efficiency (MCE) at nighttime in 375 m and 750 m resolution.

Note: The VNP/VJ147 FILDA fire modified combustion efficiency product is current being integrated NASA LAND SIPS at GSFC. The processed product will be available from the LP DAAC.