(under the class definition) Subject matter including structure responsive to two stereoscopic images as photographed or otherwise viewed at spaced points over a surface (usually of the earth) and furnishing a contour plot of the surface based on the distinctions in these images.
(1) Note. The subject matter of this subclass usually involves a photodetecting apparatus such as a photocell system which scans or otherwise responds to the stereoscopic images or records, together with apparatus to compare the photocell outputs to operate some form of indicator such as a recorder. If the indication is by a scriber, classification is in Class 33; and if the output is an error signal as for alignment purposes classification is in Class 250, especially subclass 558.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138, for general alignment inspection.
SEE OR SEARCH CLASS
33, Geometrical Instruments, 20.1+, for sight line controlled geometrical scribers.
250, Radiant Energy,
220, for photocell systems with plural photocells responsive to plural related images where the measuring is lacking.
348, Television,
26, for television systems including means to generate contours based on features in the scene viewed.
353, Optics: Image Projectors,
5, for projection involving mapping or aerial photograph rectifying.
359, Optics: Systems (Including Communication) and Elements,
470, for stereoviewers with compensation for camera positions, as of the plotting or mapping type.
