Holographic Stereogram Display Techniques for the Viewing and Mensuration of Stereo Photogrammetric Imagery.

摘要

Holographic stereograms,holograms of stereo-pair aerial-photos,are measured to determine geographical coordinates of terrain features. The holograms are stereoscopically viewed and measured in three dimensions through a conventional binocular-eyepiece microscope. A pair of cross-hair reticles in the eyepieces give the illusion of a floating cursor which,to facilitate mensuration,can be moved throughout the breadth and depth of the 3-D terrain display. Microscope dial readings are interpreted by geometrical formulae to yield coordinates of terrain features. Measurements are made relative to reference points,which appear as a three-dimensional array in the display. Aerial photo distortions are compensated by proper placement of the points. (Author)