Assessment of polarization correction impact on the calibration of Terra MODIS reflective solar bands

Aisheng Wu; Amit Angal; Xu Geng; Xiaoxiong Xiong

doi:10.1117/12.2278361

29 September 2017 Assessment of polarization correction impact on the calibration of Terra MODIS reflective solar bands

Aisheng Wu, Amit Angal, Xu Geng, Xiaoxiong Xiong

Proceedings Volume 10423, Sensors, Systems, and Next-Generation Satellites XXI; 104231C (2017) https://doi.org/10.1117/12.2278361
Event: SPIE Remote Sensing, 2017, Warsaw, Poland

Abstract

The Moderate-Resolution Imaging Spectroradiometer (MODIS), launched in 1999 on Terra and 2002 on Aqua spacecraft respectively, is a scanning radiometer that covers a wavelength range from 0.4 μm to 14.4 μm and scans the Earth over an angular range from -55° to +55°. After a few years in the Terra mission, it became extremely challenging to characterize the changes in the sensor gain and response versus scan angle (RVS) at short wavelengths due to significant degradation and increased polarization sensitivity. To better characterize the system-level degradation, the MODIS Characterization Support Team (MCST) developed an enhanced approach in Collection-6 (C6) L1B algorithm by supplementing the on-board calibration data with the Earth-scene response trends at various scan angles obtained from the pseudo-invariant desert sites. However, the trends at short wavelengths experienced significant impact due to the increased polarization sensitivity, especially at the end of scan. In this study, a polarization correction algorithm developed by MCST is applied to the Terra MODIS RSB response trends obtained from the desert sites. The trends after polarization correction are used to derive the gain and RVS based on the existing MODIS C6 calibration algorithm. Impact of the polarization correction is examined for gain, RVS and their fitting uncertainties over the entire mission. The results of this study provide useful information on how to further improve accuracy and stability of the calibrated L1B product.

Citation Download Citation

Aisheng Wu, Amit Angal, Xu Geng, and Xiaoxiong Xiong "Assessment of polarization correction impact on the calibration of Terra MODIS reflective solar bands", Proc. SPIE 10423, Sensors, Systems, and Next-Generation Satellites XXI, 104231C (29 September 2017); https://doi.org/10.1117/12.2278361

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