Photogrammetric Control Extension for Route Design

by Eugene E. Derenyi, Assoc. Prof. of Surveying Engrg.; Univ. of New Brunswick, Fredericton, NB, Canada,
Ahmed Maarek, Photogrammetrist; Terra Surveys Ltd., Ottawa, ON, Canada,

Serial Information: Journal of the Surveying and Mapping Division, 1974, Vol. 100, Issue 1, Pg. 49-61

Document Type: Journal Paper


It is of utmost importance to select such a method and instrument for aerial triangulation which provides the required accuracy in a most economical way. Nine strips of wide and super-wide angle photographs, ranging in scale from 1:2,400 to 1:21,600, were triangulated on a Zeiss PSK stereocomparator, an OMI-Bendix analytical plotter AP-2C, and on a Wild A-10 Autograph. Various bridging distances, control configurations, and degrees of polynomials were introduced during the strip adjustment. Six models are the optimum bridging distance for the wide angle photos and three models for the super-wide angle strips. A second-degree polynomial for the planimetric adjustment and a third-degree polynomial for the heights are the most suitable. The highest accuracy is provided by the stereocomparator, followed by the analytical plotter as a close second, and then by the Autograph, while the latter instrument shows the highest operation efficiency, followed by the analytical plotter, and then by the stereocomparator.

Subject Headings: Polynomials | Photogrammetry | Triangulation | Structural models | Economic factors | Photography

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