EOSAEL Modules - Functional List

Below is a list of all the modules included in PcEOSAEL, organized by function, along with a brief description of each one.  Click on any code to view a more detailed description.  Click here for an alphabetical list of the EOSAEL modules.

There are seven general categories of atmospheric effects covered in EOSAEL:

  • atmospheric transmission/radiance
  • laser propagation
  • tactical decision aids
  • battlefield aerosols
  • natural aerosols
  • target acquisition
  • support modules

Each of these categories are described briefly below.

Atmospheric Transmission and Radiance

This category holds the codes LOWTRAN, LZTRAN, UVTRAN, FASCAT, and NMMW. LOWTRAN (LOW resolution TRANsmission) is a standard code used for computing atmospheric transmission and radiance along an arbitrary path. In recent years it has been superceded by the MODTRAN (MODerate TRANsmission) model. The GUI interface replaces LOWTRAN with MODTRAN, and makes some minor enhancements to the MODTRAN model to benefit EOSAEL users. LZTRAN calculates laser transmission in the IR; UVTRAN calculates atmospheric transmission and lidar returns in the UV, and NMMW calculates atmospheric transmission in the near millimeter wave bands. The BITS code provides approximations using broad-band transmittances.  FASCAT calculates the spectral radiance of distant objects and backgrounds for any designated slant path in the atmosphere.

Laser propagation

This category holds the NOVAE code, which models high power laser propagation through the atmosphere, including the effects of thermal blooming, stimulated Raman scattering, and breakdown. 

Tactical Decision Aids

The tactical decision aids are useful programs that quickly and easily calculate obscurant position and thickness, with the goal of deciding whether a user or sensor can see through the obscurant. This includes the modules KWIK, GRNADE, COPTER, and MPLUME.

Battlefield Aerosols

This category includes the COMBIC code, which computes the transmission through clouds of dust and debris raised by high explosives, and FITTE, which calculates the effects of fire smoke plumes on electromagnetic propagation.

Natural Aerosols

XSCALE is a module for computing transmission through naturally occurring aerosols. Note that MODTRAN and LOWTRAN also contain a variety of generic natural aerosol profiles that can be included in atmospheric path transmission and radiance calculations. CLIMAT provides a database that lets you select appropriate atmospheric parameters for a variety of surface locations.

Target Acquisition

This includes the module TARGAC, which calculates the effects of contrast reduction from aerosols on probability of detection.

Support Modules

The support modules are CLIMAT, PFNDAT, and AGAUS. CLIMAT provides a database of fits to measured weather parameters over a wide variety of surface regions. PFNDAT contains an aerosol phase function database that assist in calculating the effects the various types of aerosols. AGAUS is a Mie scattering code that can use these results for estimating scattering effects.

The EOSAEL module LOWTRN has been superceeded by MODTRAN. It should also be noted that the UVTRAN user interface was not developed by Ontar, but is included as the tool to access the UVTRAN module.

Important Notice:
There are severe restrictions placed on the EOSAEL libraries by the U.S. Government and therefore some customers may not be eligible to receive all material.
Please click here for details.

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