Accession Number : AD0271438

Title :   PHOTOGRAMMETRIC FLASH TRIANGULATION FOR CORPS OF ENGINEERS FIELD USE

Corporate Author : GEONAUTICS INC WASHINGTON D C

Personal Author(s) : EICHHORN,HEINRICH K.

Report Date : 15 JUL 1961

Pagination or Media Count : 1

Abstract : An error analysis of the proposed photogrammetric flash triangulation system for Army use in extending geodetic control over short and medium ranges is presented. The proposed field instrumentation system is based on the use of portable cameras and adjustable equatorial mounts for guiding on the star background during the observations. The main advantage is that the field operations do not require the times of the occurrence of the flashes or the photographic exposures. The expected errors of the system were computed from an analysis of the covariance matrix of the 11 unknown parameters which occur in the case of minimum redundancy. Various triangulations which involve distances of less than 100 miles to 1000 miles with well-and poorlydefined geometry were studied. Under conditions of minimum redundancy results indicated that the proposed observation techniques are capable of achieving accuracies which approach that of first order triangulation. (Author)

Descriptors :   *AERIAL PHOTOGRAPHY, *GEODESICS, *MAPPING, PHOTOFLASH PROJECTILES, PHOTOGRAPHIC EQUIPMENT, ROCKETS, TRIGONOMETRY

Distribution Statement : APPROVED FOR PUBLIC RELEASE