Spectrum Management

Modification Of VIIRS Sensor Data Record Operational Code For Consistency Of Data Product Limits

The Visible Infrared Radiometer Suite (VIIRS) sensor data record (SDR) product contains geolocated and calibrated radiances, quality flags, and derived products such as brightness temperature and reflectance. The active fire team reported an inconsistency in the way radiance limits and derived products limits are generated. The quality flags are also independently determined for radiance limits and derived product limits. This paper focuses on operational code modifications to address the inconsistent radiance and derived products and quality flag determination algorithm.

The VIIRS sensor onboard Suomi NPP, which launched on October 28, 2011, contains 22 bands spanning the visible and infrared wavelengths from 0.4 to 12.5 um. The bands consist of 14 reflective solar bands (RSB), 7 thermal emissive bands (TEB), and a day night band [1]. A raw data record (RDR) is processed into a SDR which contains geolocated and calibrated radiances, quality flags, and radiance derived products such as brightness temperature and reflectance. SDR products are used to generate 22 environmental data records (EDR) including active fire, ocean color, and sea surface temperature. The active fire team reported an inconsistency in the way radiance limits and derived products limits are generated. Unfortunately, the values at the radiance and brightness temperature upper limits are inconsistent.