MODTRAN (MODerate resolution atmospheric TRANsmission) is a computer program designed to model atmospheric propagation of electromagnetic radiation for the 100-50,000 cm−1 (0.2 to 100 μm) spectral range.
This covers the spectrum from middle ultraviolet to visible light to far infrared.
The most recently released version of the code, MODTRAN6, provides a spectral resolution of 0.2 cm−1 using its 0.1 cm−1 band model algorithm.
The acronym MODTRAN was registered as a trademark of the US Government, represented by the US Air Force, in 2008.
MODTRAN6 adds support for JSON formatted input files, along with a graphical user interface 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.