Comparison of MODIS solar diffuser stability monitor calibration results for different operational configurations

Kevin A. Twedt; Amit Angal; Hongda Chen; Xiaoxiong Xiong

doi:10.1117/12.2528444

9 September 2019 Comparison of MODIS solar diffuser stability monitor calibration results for different operational configurations

Kevin A. Twedt, Amit Angal, Hongda Chen, Xiaoxiong Xiong

Author Affiliations +

Proceedings Volume 11127, Earth Observing Systems XXIV; 1112728 (2019) https://doi.org/10.1117/12.2528444
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The MODIS instruments on the Terra and Aqua spacecraft use a sunlit solar diffuser (SD), with an optional SD attenuation screen (SDS), to calibrate the reflective solar bands. A solar diffuser stability monitor (SDSM) is used to track the SD reflectance degradation on orbit, by taking a ratio of the detector response when viewing the SD compared to the response when viewing the sun. The MODIS SDSMs have been operated both with and without the SDS in place. The SDSMs have also been operated in both a fixed and an alternating mode. In the alternating mode, the SDSM detectors view the SD, sun, and a dark background in an alternating pattern with the view changing on every MODIS scan within a single orbit. In the fixed mode, the SDSM detectors are fixed on the sun view for one orbit, and then are fixed on the SD view for the following orbit. This paper reviews the history of the SDSM operational configurations used throughout the MODIS missions and discusses the differences in the SD degradation results, which may be due to differences in sun-satellite geometry, SD signal level, and stray light effects. We highlight Aqua SDSM results from two recent dates in October 2017 and July 2019, where both the fixed and alternating mode calibrations were run on the same day, providing clear examples of the calibration differences. Additionally, we show how mixing the results from calibrations done with and without the SDS for Aqua MODIS can provide more stable results.

Citation Download Citation

Kevin A. Twedt, Amit Angal, Hongda Chen, and Xiaoxiong Xiong "Comparison of MODIS solar diffuser stability monitor calibration results for different operational configurations", Proc. SPIE 11127, Earth Observing Systems XXIV, 1112728 (9 September 2019); https://doi.org/10.1117/12.2528444

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Calibration

MODIS

Sensors

Sun

Reflectivity

Diffusers

Transmittance

Keywords/Phrases

Search In:

Publication Years