MODTRAN®

Graphical User Interface

GUI

MODTRAN6 offers a new GUI that enables users to load existing cases, interactively enter or modify inputs, save their JSON formatted input files, run MODTRAN6, and graphically view the newly generated spectral output data. Users can choose to entirely avoid editing text input files and instead may run MODTRAN6 through an interactive graphical user interface (GUI).
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A Line-By-Line (LBL) Radiative Transfer

Line-by-Line

A Line-By-Line (LBL) radiative transfer option has been developed for MODTRAN®. The MODTRAN® algorithm solves the LBL radiative transfer equations at arbitrarily fine spectral resolution within 0.1 cm-1 spectral bins, stitching together contiguous bins to build the full band pass spectral. The advantage of the narrow spectral bin approach is that tail contributions from molecular transitions centered more than 0.05 cm-1 from a bin edge can be pre-calculated analytically. The number of transitions that must be modeled on-the-fly for any given 0.1 cm-1 bin is quite modest.
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Local Chemical Cloud Option

Local Chemical Cloud

The local chemical cloud option can be combined with the MODTRAN® multiple line-of-sight (MLOS) option to generate cloud images from a single MODTRAN® run. MODTRAN6 band model data is provided for the HITRAN line compilation molecular species.
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Aerosol Toolkit (ATK)

ATK

An Aerosol Toolkit (ATK) was developed as a pre-processing adjunct to the MODTRAN code. This suite of software tools generates aerosol optical property and profile data, in MODTRAN’s SAP (Spectral Aerosol Profile) format, from user input aerosol specifications.
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DISORT

DISORT

Multiple scattering contributions are most accurately computed using the plane parallel atmosphere DISORT discrete ordinate model. Many changes have to be made to the standard DISORT distribution to accurately compute the MODTRAN® scattering contributions.
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