Airborne measurements of atmospheric-path transmission and atmospheric-path (upwelled) radiance in the 8–14-µm band were obtained by applying a multiple altitude and a dual-view angle calibration technique to thermal IR line scanner data. A spectrally corrected LOWTRAN code was used to generate path transmission and upwelled radiance values corresponding to the empirical measurements. Using LOWTRAN and the multiple-altitude method, calibration of thermograms to account for atmospheric effects yields computed surface temperatures within 0.7°C of concurrent kinetic temperature readings. The angular calibration method results in similar computed surface temperature errors for 304.8-m (1000-ft) altitude data and increasing by 1.2°C/304.8-m up to a 1828.8-m (6000-ft) altitude. This paper contains results of a comparative analysis of these approaches for atmospheric calibration.
© 1986 Optical Society of America
Arthur E. Byrnes and John R. Schott, "Correction of thermal imagery for atmospheric effects using aircraft measurement and atmospheric modeling techniques," Appl. Opt. 25, 2563-2570 (1986)