A radiometric model designed to facilitate target to background image modeling has been developed (c.f. Schott & Biegel 1985) . The model was designed to incorporate atmospheric transmission, upwelled and ciownwelled path radiance and variations in these factors as a function of view angle. The radiometric model has been applied to Idnetic temperature image models to simulate long wave infrared image characteristics, including spatial resolution and scale. A limitation of the model as presented to this point has been the lack of empirical data on emissivities of natural objects. This paper includes a description of two devices for measurement of the hemispheric and angular emissivity from large irregular surfaces. Emissivities for selected materials are presented and incorporated into the model. The effect of emissivity on simulated images is discussed. This model is being developed as part of an overall effort to expand long wave infrared image science. The potential for application of the expanded model to sensor performance evaluation and target recognition assessment are discussed.
John R. Schott,
"Incorporation Of Angular Emissivity Effects In Long Wave Infrared Image Models", Proc. SPIE 0685, Infrared Technology XII, (10 December 1986); doi: 10.1117/12.936495; https://doi.org/10.1117/12.936495