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19 November 2012 Calibration of NPP VIIRS fire detection band using lunar observations
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Abstract
The National Polar-orbiting Partnership (NPP) Visible Infrared Imager Radiometer Suite (VIIRS) includes a fire detection band at roughly 4 μm. This spectral band has two gain states; fire detection occurs in the low gain state above approximately 343 K. VIIRS thermal bands utilize an on-board blackbody to provide on-orbit calibration. However, as the maximum temperature of this blackbody is 315 K, the low gain state of the 4 μm band cannot be calibrated in the same manner. Regular observations of the Moon provide an alternative calibration source, as the maximum surface temperature is around 390 K. The periodic on-board high gain calibration along with a surface temperature map based on LRO DIVINER observations was used to determine the emissivity and reflected radiance of the lunar surface at 4 μm; these factors and the lunar data are then used to calibrate the low gain state of the fire band. Our analysis suggests that the responsivity of the low gain state is lower than the pre-launch value currently in use.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeff McIntire, Boryana Efremova, and Xiaoxiong Xiong "Calibration of NPP VIIRS fire detection band using lunar observations", Proc. SPIE 8533, Sensors, Systems, and Next-Generation Satellites XVI, 85331B (19 November 2012); https://doi.org/10.1117/12.971228
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