Photogrammetric plotting apparatus

Abstract

A photogrammetric plotting apparatus is provided. The apparatus comprises an optical system means for viewing by an operator of an image of a first stereomodel derived from a pair of stereoscopically related photograms. The apparatus is further comprised of an operator controlled means for effecting stereomodel exploring motions relative to the photograms, and a tracing or display device. A means is provided for converting the exploring motions into plotting motions for the tracing or display device. A means is additionally provided for scanning image data of a second model to produce an image of the second model. Means is provided for conveying the image of the second model to the optical system. The optical system includes a means for superimposing the image of the second model on the image of the first stereomodel for simultaneous viewing by the operator. Preferably, scanned image data of the second model is on the tracing or display device and the means for conveying the image of the second model to the optical system is a television camera/monitor system. The apparatus finds particular application in the revision of maps, but has other related applications.

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