PARALLELISM OF THE STEREOMETRIC CAMERA BASE TO THE DATUM PLANE IN CLOSE-RANGE PHOTOGRAMMETRY.

For a facade elevation drawing compiled using an analog plotter, the stereometric camera base should be parallel to the object plane at the time of exposure. The displacements in the single and stereo-image due to rotation of the object plane are discussed. In order to make the focal plane parallel to the datum plane, an auxiliary apparatus was developed. The apparatus consists mainly of a double-pentagonal prism and a base bar with two miniature rods set up at the ends of the base bar. An application of this apparatus at a test field and the obtained accuracy are presented.