Ontar
Encyclopedia
Ontar Corporation - is a research and development
Research and development
The phrase research and development , according to the Organization for Economic Co-operation and Development, refers to "creative work undertaken on a systematic basis in order to increase the stock of knowledge, including knowledge of man, culture and society, and the use of this stock of...

 company, which specializes in atmospheric sciences and other tasks.

Ontar was founded in 1981, and became a reseller of software in the field of atmospheric radiation. Ontar launched PCTran in 1987, in that time it was one of the first PC based software for high spectral resolution calculations of atmospheric transmission. PcTran (based on MODTRAN
MODTRAN
MODTRAN is a computer program designed to model atmospheric propagation of electromagnetic radiation for the 100-50,000 cm-1 spectral range....

) allows to calculate radiance
Radiance
Radiance and spectral radiance are radiometric measures that describe the amount of radiation such as light or radiant heat that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction. They are used to characterize both emission from...

s.
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