Citation

Holdridge RH. Transp. Res. Rec. 1979; 736: 1-4.

Copyright

(Copyright © 1979, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

Aerotriangulation research conducted by the Wisconsin Department of Transportation to determine the minimum control configuration that would yield accurate photographic control with error-detection capability is described. A new aerotriangulation program package developed for the department's photogrammetry system was used.

CONCLUSIONS are based on the results of four projects in which 1:3000-scale photography was used at a flying height of 457 m (1500 ft). In the test procedure, an adjustment that used all available control was taken as a basis of comparison in determining a minimum control standard, with redundancy, to allow for detection of single and multiple errors. Accuracies were determined based on the standard deviation of discrepancies among withheld-control points and pass-point movement. The relation between analytical instrumentation, control configuration, and program capabilities has resulted in standards that produce equal adjustments to different projects. The results indicate that the bridging distance between successive vertical wing points and successive horizontal picture points can be as much as six models and all control points can be in double-overlap areas. The new program package has greatly reduced field survey time and increased design flexibility.