English

A binocular optical instrument for hel­ping an observer to view PHOTOGRAPHS, or DIAGRAMS, to obtain the mental impression of a three-dimen­sional model.

The mental impression of a three-dimensional model which results from viewing two overlapping perspective views. Also called stereoscopic model or stereomodel.

In PHOTOGRAMMETRY, two PHOTOGRAPHS of the same area taken from different AIR STATIONS so as to afford STEREOSCOPIC VISION. Frequently called a stereopair.

An instrument for compiling a MAP or obtaining spatial solutions by observation of STEREO­SCOPIC IMAGES formed by STEREO­SCOPIC PAIRS. See COMPILATION.

The particular application of BINOCULAR VISION which enables the observer to obtain the impression of depth, usually by means of two diffe­rent perspectives of an object, as two PHOTO­GRAPHS taken from different AIR STATIONS.

The science and art which deals with the use of BINOCULAR VISION for observation of a pair of overlapping PHOTOGRAPHS or other perspec­tive views, and with the methods by which such viewing is produced.

A triangulation procedure that uses a STEREO­SCOPIC PLOTTING INSTRUMENT to obtain the successive ORIENTATION of the STEREOSCOPIC PAIRS of photographs into a continuous strip. The spatial solu­tion for the extension of horizon­tal and/or verti­cal CONTROL using these STRIP COORDINATES may be obtained by either graphical or computational procedu­res. Also called bridging.

Graduation of SHADING by numerous separate touches. Shallow areas on CHARTS, for instance, are sometimes indicated by numerous dots decreasing in density as the DEPTH in­creases.

Apparent decrease in the vertical dimension of an object near the HORIZON, due to large inequality of ATMOSPHERIC REFRACTION in the LINE OF SIGHT to the top and bottom of the object. The opposite is TOWE­RING.

In a COMPUTER, a device in which DATA can be inserted and preserved, and from which DATA can be retrieved. Common storage devices are magnetic tapes, drums, disks and cores.