MODTRAN4: Multiple scattering and bi-directional reflectance distribution function (BRDF) upgrades to MODTRAN

P. K. Acharya, A. Berk, G. P. Anderson, N. F. Larsen, S. Chee Tsay, K. H. Stamnes

Research output: Contribution to journalConference articlepeer-review

65 Scopus citations

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 μm 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.

Original languageEnglish
Pages (from-to)354-362
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3756
StatePublished - 1999
EventProceedings of the 1999 Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III - Denver, CO, USA
Duration: 19 Jul 199921 Jul 1999

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