An image of an out-of-scale aerial survey photograph is projected onto a reflective surface of an unstretched, flexible mirror vertically positioned in a frame. The back of the mirror is connected to a plurality of control rods arranged in a coordinate system. The control rods are horizontally, movably supported on the frame so that the mirror is supported vertically free of tension. The mirror reflects the image onto a template having key points which also appear on the photograph. The control rods are selectively moved toward or away from the mirror to deform the mirror without inducing tension in the mirror so that adjacent areas of the mirror surface are not deformed as the reflected image is brought into register with the corresponding image on the template. Once an area of the mirror is deformed, the control rods are locked in position to prevent interaction by the deformation of other areas of the mirror. When the reflected image is in register with the template, the projection is stopped, an unexposed photographic film placed at the template location, and the projection resumed to produce an in-scale aerial photomap of the aerial survey photograph.
A target for use in photogrammetric analysis that does not distort the object to be analyzed has been developed. The target is formed by mixing a diffuse material with a solvent and then applying the mixture to the surface of the object to be analyzed. The object is then coated with a reflective material so that the diffuse material forms a reflective target suitable for use in photogrammetric analysis.
