Update on the performance of Suomi-NPP VIIRS lunar calibration

Zhipeng Wang; Jon Fulbright; Xiaoxiong (Jack) Xiong

doi:10.1117/12.2186794

8 September 2015 Update on the performance of Suomi-NPP VIIRS lunar calibration

Zhipeng Wang, Jon Fulbright, Xiaoxiong (Jack) Xiong

Proceedings Volume 9607, Earth Observing Systems XX; 960720 (2015) https://doi.org/10.1117/12.2186794
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Lunar observations have been regularly scheduled for the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard the Suomi National Polar-orbiting Partnership (S-NPP) satellite since its launch on October 28th, 2011. In reference to the ROLO irradiance model, the detector gain coefficient or F-factor can be derived from these lunar observations for the reflective solar bands (RSB). Unlike its predecessor Moderate Resolution Imaging Spectroradiometer (MODIS), the Moon and the on-board solar diffuser (SD) are viewed by VIIRS detectors at the same angle of incidence (AOI) to the half angle mirror (HAM). Eliminating the impact from the variation in the instrument response to the HAM AOI, this design allows the detector gain changes tracked by the Moon and the SD to be directly compared. In this paper, we update the lunar F-factors from the scheduled lunar calibration. The long-term trends of the lunar F-factor trending and the SD F-factor trending still agree in general for all RSBs. We also calculate the lunar F-factor at detector level and compare the detector dependency of the lunar F-factor and the SD F-factor. For a few RSBs at shorter wavelengths, a bias of up to 1% between the two has been identified. Using the detector-dependent lunar F-factors will decrease the retrieved Earth view radiance of lower-number detectors in relative to higher-number detectors than the SD F-factors. The inconsistency indicates systematic bias between the lunar and SD calibration approaches.

Citation Download Citation

Zhipeng Wang, Jon Fulbright, and Xiaoxiong (Jack) Xiong "Update on the performance of Suomi-NPP VIIRS lunar calibration", Proc. SPIE 9607, Earth Observing Systems XX, 960720 (8 September 2015); https://doi.org/10.1117/12.2186794

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available