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Passive remote sensing of slant path transmittance from aircraft.

This paper presents a passive method for computation of thermal IR transmittance over slant paths. This double viewing angle technique utilizes data gathered by a radiometer or imager carried by a manned or unmanned aircraft. A sensitivity analysis showed the effect of changes or errors in input parameters on calculated transmittances. The analysis suggested the applicability and limitations of this method. Accuracies attainable through the use of the double viewing angle method appear to be similar to those from more complex techniques for many atmospheric conditions.