FASCAT - EOSAEL Module

FASCAT is a fast atmospheric scattering model for calculating apparent background and target radiance fields due to scattered sunlight. It is based on research by Wayne S. Hering, Visibility Laboratory, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093, under the sponsorship of the AFGL, Optical Physics Division. The FASCAT computer code calculates the spectral radiance of distant objects and backgrounds for any designated slant path in the atmosphere. The apparent radiance is the sum of the residual background or target radiance plus the path radiance generated by the scattering of light reaching the path from the sun and the surrounding sky and terrain. Several input options are available for the specification of the vertical profiles of aerosol properties. Cloud information is entered by specification of the cloud type, amount, altitude of base and top, and the relative optical thickness (average, thin, or thick). For designated sensor and target altitudes, the apparent contrast is calculated for cloud free slant paths, which may or may not transverse a fractional cloud layer. Objects in sunlight or shadow may be viewed against sky, cloud, or terrain backgrounds.

PcEosael Overview
Alphabetical List of EOSAEL Modules
Functional List of EOSAEL Modules


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