Kelsh Stereoplotter
Harry T. Kelsh introduced the Kelsh optical projection stereoplotter in 1945.
stereoplotter
An instrument that projects a stereoscopic image from aerial photographs, converts the locations of objects and landforms on the image to x-, y-, and z-coordinates, and plots these coordinates as a drawing or map.
Elevations at individual points (commonly in systematic arrays or grids of geographic significance) as surveyed on the Earth's surface, or calculated by stereoplotters, or digitized from existing maps can be expressed in digital numbers.
manually, an operator looks at a pair of stereophotos through a stereoplotter and must move two dots together until they appear to be one lying just at the surface of the ground ...
Stereoplotters essentially duplicate the position and orientation of the aerial camera at the time an individual stereo pair was acquired.
Generally, the process involves using specialized equipment (a stereoplotter) to project overlapping aerial photos so that a viewer can see a three-dimensional picture of the terrain, known as a photogrammetric model.
orthophotoscope Photomechanical device used in conjunction with a double-projection stereoplotter for producing orthophotograph. overedge Any portion of a map lying outside the nominal map border (neatline).
 See also: Map, Elevation, Image, Surface, Contour
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