Moderate Spectral Atmospheric Radiance and Transmittance (MOSART)

ars_thumbMOSART is a U.S. Department of Defense standard code for predicting the radiative environment in the UV/VIS/IR/MMW to provide input for scene and signature simulations. MOSART provides atmospheric transmission along sensor-target line-of-sight paths, optical radiance backgrounds (e.g., terrain, clouds, limb, and space) against which targets are detected by sensor systems, and appropriate irradiances (e.g., solar, lunar, earthshine, skyshine). MOSART uses the same band model and 1 cm-1 sampled (2 cm-1 resolution) band parameters database found in MODTRAN® v3.7, which has been derived from the 1996 HITRAN line atlas. An extensive set of global databases is incorporated into the code, including climatologies, terrain elevation, water/snow compositions, ecosystem type, climatology atmospheric profiles, hydrology, soils, and land cover classes. Coupled with the ecosystem and terrain elevations are composite terrain scene types with appropriate boundary layer aerosol compositions.

The MOSART code provides the path transmittance, path radiance, apparent solar and lunar irradiances, and the diffuse, multiple scattered irradiances on a three-dimensional spatial grid required to support scene generation software. It also provides the diffuse space background and appropriate geometry parameters including solar, lunar, and planetary ephemerides. The Global Emissive Observables Temperature (GEOTEMP) code, as a companion to MOSART, provides the terrain and ocean surface temperatures as a function of time of day for a four-dimensional grid for a set of surface orientations.

MOSART was most recently supported and distributed by the Naval Research Laboratory (NRL), however funding for MOSART was terminated in FY2012. The last released version of MOSART is v2.0.4, which is available for download from the CPI website.

In order to continue to support and grow an atmospheric and radiative environment code to support CPI scene generation projects, CPI developed the AETHERTM radiative transfer model from MOSART. See the Radiative Transfer Capabilities page for more information on AETHERTM and MOSART.