Assessment of VIIRS day-night band high gain calibration using stars

Xiaoxiong Xiong; Truman Wilson; Kevin Vermeesch

doi:10.1117/12.2597980

12 September 2021 Assessment of VIIRS day-night band high gain calibration using stars

Xiaoxiong Xiong, Truman Wilson, Kevin Vermeesch

Proceedings Volume 11858, Sensors, Systems, and Next-Generation Satellites XXV; 118580Q (2021) https://doi.org/10.1117/12.2597980
Event: SPIE Remote Sensing, 2021, Online Only

Abstract

The VIIRS has a unique spectral band that can sense reflected light from space during both day and nighttime, thus referred to as the day-night band (DNB). This band operates in three different gain stages: low, mid, and high gain (LG, MG, and HG) that cover a remarkable dynamic range with its HG stage being extremely sensitive to low-light scenes. Similar to its reflective solar bands, the VIIRS uses an on-board solar diffuser for its DNB LG stage calibration, whereas the DNB MG and HG calibrations are performed using relative or ratioing approaches. In this paper, we provide an assessment of VIIRS DNB HG calibrations using stars that appear in the field-of-view of its space view (SV), focusing on the computation of the gain trending and associated tool development. We also describe various strategies and procedures developed for DNB HG calibration stability monitoring and inter-comparisons among different VIIRS instruments and discuss some of the complications and limits to this approach, including under-sampling of the stellar image, saturation, and crowding. For S-NPP VIIRS, it includes the use of the modulated relative spectral response (RSR) resulting from wavelength-dependent degradation of the sensor optics. Results show that the star-based response trending for the DNB HG is consistent with that derived from on-board solar diffuser and that the calibration difference between S-NPP and N-20 VIIRS DNB requires additional effort to address, especially for research studies and applications using data from both sensors.

Conference Presentation

Citation Download Citation

Xiaoxiong Xiong, Truman Wilson, and Kevin Vermeesch "Assessment of VIIRS day-night band high gain calibration using stars", Proc. SPIE 11858, Sensors, Systems, and Next-Generation Satellites XXV, 118580Q (12 September 2021); https://doi.org/10.1117/12.2597980

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