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Photogrammetry and Laser Scanning - Documenta, uniquely, makes use of the latest photogrammetric and laser scanning technologies, utilizing the most appropriate methodology for each individual project, budget and schedule. |
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1 - Photogrammetry (noun) [International Scientific Vocabulary]: First appeared in 1875; The science of making reliable measurements (recording) by the use of photographs. |
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We utilize an algorithm called
"bundle adjustment", heart of modern digital
photogrammetry and developed for high-precision applications. In it, on a final calculation, all computed positions, distances, coordinates,
and levels are simultaneously adjusted according to
any additional controls and constraints our experienced analysis
indicates appropriate to use, and to a theoretical optical model (central projection theory).With determination of the precise situation of the camera or cameras in each photograph (camera stations), we can locate the exact position where rays traced from these camera stations meet. Depending on the application, we use a minimum of five rays (five pictures) to ensure the targeted accuracy at any given point. Finally, in the process called restitution, extremely homogeneous and precise 3D dimensional data is obtained from digitized points in the photographs, allowing for the production of technical drawings. Further, the CAD/GIS interface allows for the thematic layering of the "as-is" information and further modeling, querying, and visioning when required. |
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How Does Laser Scanning Work? |
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Click here to see a larger point cloud example. Point Cloud Village Store Facade, at the Yosemite National Park, CA. |
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What is more important and critical is that we utilize the best adequate technology, or the association of both, to efficiently and economically document the "existing conditions" - the use of either technology is decided solely based on the best solution for each project. |
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Copyright © 1997/2006 • Documenta Surveys • Reproduction or editing of materials for commercial use without written permission is strictly prohibited. |