Research on Stadimetric Ranging: Visually Matching the Apparent Size of Objects.
HUMAN RESOURCES RESEARCH ORGANIZATION ALEXANDRIA VA
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HUMRRO-TR-73-27DAHC19-73-C-0004DA-2-Q-062107-A-745Visual acuity, Range finding, PerformanceHuman, Antiaircraft gunnery, Target discrimination, SizesDimensions, Test methods, Simulation, Errors, Estimates, Optical equipment, Statistical analysisStadimetric ranging, JudgmentFive experimental tasks were devised that simulated a stadimetric ranging task requiring observers to estimate when air defense open- and cease-fire events should occur when engaging inbound and outbound aircraft. The laboratory tasks varied the location of the stadimetric aid with respect to the targets location. The results indicated that accuracy and bias differential error for inbound and outbound judgments in the perceptual judgments were affected by the location of the size-judgment aid. Variation in visual acuity was related to perceptual errors for some tasks. Modified author abstract