SEEKVAL PROJECT ID1, characteristics of inherent and apparent scenes

SEEKVAL Project ID1 was conducted to determine instrumentation and data reduction techniques suitable for measuring and documenting both apparent and inherent contrast during field tests. Three types of instrumentation were used: (1) cameras to photograph scenes from target acquisition ranges, (2) photometers to measure illumination of scene objects at close range, and (3) airborne and ground instruments for measuring atmospheric characteristics. Field data collection occurred at Ft. Lewis, Washington, during July 1974. It involved photographing and measuring illumination characteristics of a target scene consisting of trucks and portable Gray Scale panels. Simultaneously, characteristics of the atmosphere were measured by highly specialized equipment designed for the purpose. Eleven missions were flown covering both clear and overcast weather. Data reduction techniques, compatibility of instrumentation with field test aircraft and operations, costs, and adequacy of data are factors leading to recommendations for field test instrumentation. Guidance is given on use of photometers for vehicle type targets, the use of Gray Scale panels, targets, math models, color film, and infrared black and white film for determining target/background contrast.