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Apparatus and method for optical annotation of orthophotographs
Apparatus and method for optical annotation of orthophotographs
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机译：正射影像的光学注释装置和方法
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摘要
Apparatus employed in conjunction with the optical transmission train of an orthophotographic printer to automatically add graphic data to the orthophotograph, thus producing an orthophotographic map. Such apparatus comprises an indexable turret with a series of apertures formed about its periphery, one transparency of a series of transparencies retained within each aperture of the turret, each transparency bearing the image of a cartographic symbol or bit of alphanumeric data, a light source and a condensing lens for directing the rays of light through the selected transparency, and a mirror for reflecting the image of the symbol on the selected transparency into the optical transmission train of the orthophotographic printer. The mirror is located at an angle to the plane of the optical transmission path and serves the dual function of (1) permitting the image of a selected portion of an aerial photograph to be projected therethrough, and/or (2) reflecting the image on the illuminated transparency downwardly through the optical transmission train in the same fashion as a reflex lens system. The mirror may be either semi-reflecting or fully reflecting; in the latter instance, a solenoid controls the pivotal movement of the mirror in to, and out of, the path of the optical transmission train. By virtue of such arrangements, the recording film is exposed to receive a distortion free aerial photograph, or orthophotograph, and appropriate symbols for annotating the orthophotograph.
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