The MODTRAN® (MODerate resolution atmospheric TRANsmission) computer code is used worldwide by research scientists in government agencies, commercial organizations, and educational institutions for the prediction and analysis of optical measurements through the atmosphere. MODTRAN was developed and continues to be maintained through a longstanding collaboration between Spectral Sciences, Inc. (SSI) and the Air Force Research Laboratory (AFRL). The code is embedded in many operational and research sensor and data processing systems, particularly those involving the removal of atmospheric effects, commonly referred to as atmospheric correction, in remotely sensed multi- and hyperspectral imaging (MSI and HSI). Read More


MODTRAN6 offers a new graphical user interface (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. Text input files are optional when using the new interactive GUI. Read More


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 spectrum. Read More

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 a wide range of molecular species. Read More


An Aerosol Toolkit (ATK) is available 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. Read More