Assessment of the on-orbit MODIS SRCA spectral uncertainty

Emily J. Aldoretta; Daniel Link; Kevin A. Twedt; Xiaoxiong Xiong

doi:10.1117/12.2321149

7 September 2018 Assessment of the on-orbit MODIS SRCA spectral uncertainty

Emily J. Aldoretta, Daniel Link, Kevin A. Twedt, Xiaoxiong Xiong

Proceedings Volume 10764, Earth Observing Systems XXIII; 1076412 (2018) https://doi.org/10.1117/12.2321149
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

The Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on board the Terra and Aqua space- craft are equipped with several on-board calibrators (OBCs) and continue to operate normally since launch. One such calibrator is the Spectro-Radiometric Calibration Assembly (SRCA), whose regular calibrations provide accurate measurements in radiometric, spatial and spectral modes. The SRCA is able to monitor and measure the center wavelength (CW) shift, the bandwidth (BW) shift and a major portion of the relative spectral response (RSR) for each of the MODIS reflective solar bands (RSBs) while operating in spectral mode. However, there are several factors that influence the uncertainties when calculating these results. This paper provides a brief overview of the SRCA in spectral mode, along with how the CWs, BWs and RSRs of the MODIS RSBs are calculated. The operational factors that contribute to the spectral uncertainty are also discussed, including the variation of the half-included angle (β) and the grating motor offset angle (θ_off ) of the monochromator. A comparison between the theoretical and on-board CW uncertainty is also provided.

Conference Presentation

Citation Download Citation

Emily J. Aldoretta, Daniel Link, Kevin A. Twedt, and Xiaoxiong Xiong "Assessment of the on-orbit MODIS SRCA spectral uncertainty", Proc. SPIE 10764, Earth Observing Systems XXIII, 1076412 (7 September 2018); https://doi.org/10.1117/12.2321149

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