Stereo, photogrammetric, plotting apparatus comprises a pair of projecting rods supported by universal joints. Each rod is associated with a plate-carrier carriage and is linked to the carriage by a joint in the form of a pin movable along a concave surface of the rod. Both rods are linked to a third carriage by a joint movable along the concave surfaces ot the two rods.
An arrangement for producing photographs which may be used for photogrammetric surveys of spatial objects, in which control points are established in the spatial object. Two photographs are taken using central projections with different positions of the projection center. The control points are the component of a mobile control point system having a reference with four points with known position coordinates constituting a quadrangle. At least two space points located outside the reference plane, have unequal or identical position coordinates relative to the reference plane. At least the space position coordinates of one space point and the space position coordinates of the other space point are known, and at least six such points appear on each of the two photographs. To increase the accuracy of determining the unknown in the transformation equations, a reference plane with more than four points, preferably sixteen points, is introduced into the spatial object to be measured. For more accurate determination of the two projection centers, a reference plane with more than two space points is introduced into the spatial object to be measured. For control purposes, more than two photographs are made with varying spatial positions of the projection centers.
