26 April 2010 Factors related to low-slant angle affecting airborne video interpretability
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The following material is given to address the effect of low slant angle on video interpretability: 1) an equation for the minimum slant angle as a function of field-of-view to prevent no more than a &sqrt2; change in GSD across the scene; 2) evidence for reduced situational awareness due to errors in perceived depth at low slant angle converting to position errors; 3) an equation for optimum slant angle and target orientation with respect to maximizing exposed target area; 4) the impact of the increased probability of occlusion as a function of slant angle; 5) a derivation for the loss of resolution due to atmospheric turbulence and scattering. In addition, modifications to Video-NIIRS for low slant angle are suggested. The recommended modifications for low-slant angle Video-NIIRS are: 1) to rate at or near the center of the scene; and 2) include target orientations in the Video-NIIRS criteria.
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Darrell Young, Darrell Young, Tariq Bakir, Tariq Bakir, Robert Butto, Robert Butto, Fred Petitti, Fred Petitti, } "Factors related to low-slant angle affecting airborne video interpretability", Proc. SPIE 7668, Airborne Intelligence, Surveillance, Reconnaissance (ISR) Systems and Applications VII, 76680N (26 April 2010); doi: 10.1117/12.849582; https://doi.org/10.1117/12.849582

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