THE PRECISE DETERMINATION OF THE POSITION OF A POINT IN SPACE, FROM PHOTOGRAPHS TAKEN AT TWO GROUND STATIONS,

摘要

Simultaneous photographs are taken,of the same aerial point,by two cameras on the ground. Stars also are photographed,on some or all of the plates. Here the mathematical procedure is developed and described for finding accurately the position of the aerial point with respect to a set of terrestrial axes. The formulae are designed to expedite the numerical calculations as much as possible,consistently with an accuracy of the order of a second of arc; i.e.,of better than a foot at 50,000feet. Another less accurate procedure is also described that does not involve star-images on all of the plates. The present discussion is applicable to the case where both camera axes are vertical. Some of the formulae are applicable also to oblique camera axes. (Author)