Aerial polygonometry and leveling using reference planes of distance

Abstract

In existing methods, the plane of the first image of the route is usually taken as the conditional horizontal plane. In this case, it is necessary to take into account the difference in flight altitude in the formulas expressing the distance. It seems simpler to us to take as a conditional horizontal plane the plane passing through the base and the line of intersection of the planes of a stereoscopic pair of adjacent planimetric aerial photographs of one route. We call this base plane the distance plane. The direction of the distances in each pair is slightly different from the vertical direction, since the difference in flight altitudes is small and the photographs are planimetric with a small angle of inclination. The lines of intersection of the planes of the images of a given pair with the distance plane will be parallel to each other and form straight lines of zero distortion of both images in relation to the distance plane.

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