Abstract
Pairs of photographs taken with the cameras directed along the photography base were used for calibrating a tunnel. Shapes, dimensions and locations of the vertical cross-sections of the tunnel were derived after the photographs had been oriented to a state of auto-collimation. Control data for aligning the camera-axes were provided by two targets. Only the locations of their images on the plates were used for the orientation, and no special measurements were required for establishing control points. The adequacy of the accuracy of the method was confirmed by control measurements on the site.
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