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Proceedings Article

MODTRAN4: multiple scattering and bidirectional reflectance distribution function (BRDF) upgrades to MODTRAN

[+] Author Affiliations
Prabhat K. Acharya, Alexander Berk

Spectral Sciences, Inc. (USA)

Gail P. Anderson, George P. Anderson

Air Force Research Lab. (USA)

North F. Larsen

Raytheon ITSS (USA)

Si Chee Tsay

NASA Goddard Space Flight Ctr. (USA)

Knut H. Stamnes

Univ. of Alaska/Fairbanks (USA)

Proc. SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, 354 (October 20, 1999); doi:10.1117/12.366389
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From Conference Volume 3756

  • Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III
  • Allen M. Larar
  • Denver, CO | July 18, 1999

abstract

Radiance multiply scattered from clouds and thick aerosols is a significant component in the short wave IR through the visible region of the electro-optical (EO) spectrum. In MODTRAN, until very recently, multiple scattering predictions could not vary with the azimuth of the line-of-sight (LOS), although the single scattering component of the radiance did take the azimuthal variation into account. MODTRAN has now been upgraded to incorporate the dependence of multiple scattering (MS) on the azimuth of the LOS. This was accomplished by upgrading the interface between MODTRAN and DISORT, which is used as an MS subroutine in MODTRAN. Results from the upgraded MODTRAN are compared against measurements of radiance in a cloudy sky in the 1.5 - 2.5 micrometer region. Furthermore, taking advantage of DISORT, the upgraded version of MODTRAN can accommodate parameterized BRDFs (Bi-Directional Reflectance Distribution Functions) for surfaces. Some results, which demonstrate the new MODTRAN capabilities, are presented. Additionally, MS results from MODTRAN are compared to results obtained from a Monte-Carlo model.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Prabhat K. Acharya ; Alexander Berk ; Gail P. Anderson ; George P. Anderson ; North F. Larsen, et al.
"MODTRAN4: multiple scattering and bidirectional reflectance distribution function (BRDF) upgrades to MODTRAN", Proc. SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, 354 (October 20, 1999); doi:10.1117/12.366389; http://dx.doi.org/10.1117/12.366389


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