12 October 2015 Tracking Terra MODIS on-orbit polarization sensitivity using pseudo-invariant desert sites
Author Affiliations +
Abstract
The Moderate-Resolution Imaging Spectroradiometer (MODIS) is currently flying on NASA's Earth Observing System (EOS) Terra and Aqua satellites, launched in 1999 and 2002, respectively. MODIS reflective solar bands (RSB) in the visible wavelength range are known to be sensitive to polarized light based on prelaunch polarization sensitivity tests. The polarization impact is dependent on scan angle and mirror side. After about five years of on-orbit operation, it is found that a few shortest-wavelength bands of Terra MODIS show increased polarization sensitivity. In this study, we examine the impact of polarization on measured top-of-atmosphere (TOA) reflectances over pseudo-invariant desert sites. The standard polarization correction equation is used in combination with simulated at-sensor radiances by the Second Simulation of a Satellite Signal in the Solar Spectrum (6SV), Vector Radiative Transfer Code. Key Mueller matrix elements describing the polarization and gain correction of these bands are derived over the mission lifetime. Results indicate that the polarization sensitivity increases with scan mirror’s angle of incidence (AOI) and relatively large impact is observed from mirror side 2. At the end of 2009, it reaches a peak at approximately 30% at 0.41 μm and stabilizes since then.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aisheng Wu, Aisheng Wu, Xu Geng, Xu Geng, Andrew Wald, Andrew Wald, Amit Angal, Amit Angal, Xiaoxiong Xiong, Xiaoxiong Xiong, } "Tracking Terra MODIS on-orbit polarization sensitivity using pseudo-invariant desert sites", Proc. SPIE 9639, Sensors, Systems, and Next-Generation Satellites XIX, 963914 (12 October 2015); doi: 10.1117/12.2196473; https://doi.org/10.1117/12.2196473
PROCEEDINGS
10 PAGES


SHARE
RELATED CONTENT

On-orbit calibration performance of MODIS TDI bands
Proceedings of SPIE (September 22 2013)
Update on the performance of Suomi-NPP VIIRS lunar calibration
Proceedings of SPIE (September 07 2015)
Utility of MODIS-Terra for ocean color applications
Proceedings of SPIE (October 04 2007)
Using Dome C for MODIS calibration and characterization
Proceedings of SPIE (October 08 2008)

Back to Top