MODIS reflective solar bands uncertainty analysis

Joseph A. Esposito; Xiaoxiong Xiong; Aisheng Wu; Junqiang Sun; William L. Barnes

doi:10.1117/12.558106

26 October 2004 MODIS reflective solar bands uncertainty analysis

Joseph A. Esposito, Xiaoxiong Xiong, Aisheng Wu, Junqiang Sun, William L. Barnes

Proceedings Volume 5542, Earth Observing Systems IX; (2004) https://doi.org/10.1117/12.558106
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

A key instrument for the NASA Earth Observing System (EOS) mission, the Moderate Resolution Imaging Spectroradiometer (MODIS), is currently operating on-board the Terra and Aqua spacecrafts. This paper discusses the calibration uncertainty analysis for the MODIS Reflective Solar Bands. Each MODIS, either on the Terra or on the Aqua spacecraft, has 20 reflective solar bands, making observations at three different nadir spatial resolutions: 250m (B1-2), 500m (B3-7), and 1000m (B8-19, and B26). The 250m, 500m, and 100m bands have 40, 20, and 10 detectors per band, respectively. The reflective solar bands spectral wavelengths are between 0.41 and 2.3 μm. On-orbit, a solar diffuser is used for the reflective solar bands calibration. For the high gain ocean color bands (B8-16), a retractable attenuation pinhole screen is placed in front of the solar diffuser during each calibration. For the reflective solar bands, the specified uncertainty at the typical scene is 2% in reflectance and 5% in radiance. The uncertainty analysis to be presented in this paper will include the approaches and estimated results for Terra MODIS. Aqua MODIS L1B uncertainty is not reported but is extremely similar to Terra. Emphasis will be on the solar diffuser bi-directional reflectance factor characterization at pre-launch since it is a major contributor to the reflective solar bands uncertainty. Other factors include the Earth view response-versus-scan angle, solar diffuser degradation and attenuation screen effect. For the Terra MODIS instrument, the estimated uncertainties based on the instrument characterization and performance will be compared with the specifications.

Citation Download Citation

Joseph A. Esposito, Xiaoxiong Xiong, Aisheng Wu, Junqiang Sun, and William L. Barnes "MODIS reflective solar bands uncertainty analysis", Proc. SPIE 5542, Earth Observing Systems IX, (26 October 2004); https://doi.org/10.1117/12.558106

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