United States Department of Transportation
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Abstract:In the fall of 1997, the Photogrammetry and Control Unit of the Survey Section requested authorization to research the use of Airborne GPS controlled photogrammetry for engineering and design purposes. The research was to provide data toward solving questions of cost savings, accuracy and acceptability of this technology in terrain of changing topography. Since accuracy and procedural standards are still being developed for this new technology, and few practical papers showing results have been published, the Maine Department of Transportation decided to try it and published the results. Two different projects with different terrain patterns and different scopes were chosen and targeted traditionally. The number of control points used in the final aerotriangulation was determined by resolving error propagation of the remaining targeted control points. Once current map accuracy standards were met within the control target coordinate set, the photogrammetric mapping was completed. Each project was mapped by a different consultant, using different aerotriangulation methods. The results indicate that current standard map accuracy standards can be met using Airborne GPS controlled photogrammetry with changing terrain and changing topography. The cost savings of the Airborne GPS controlled photogrammetry is mostly in the targeting stage of the projects, as would be expected.
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