Page 186 - Green - Maritime Archaeology: A Technical Handbook. 2nd ed

Chapter 6
Photogrammetric Techniques
I. SITE RECORDING
Photography can be used to record the relationships between artifacts on the site and help in the production of site plans, thus complementing conventional survey work. In other cases photography can be used for photogrammetric purposes to obtain measurements and as the primary method for producing site plans. Photogrammetric techniques include mul- tiviewpoint photogrammetry, where data from multiviewpoint photographs are manipulated to obtain three-dimensional information; and stereo- photogrammetry, where three-dimensional information is obtained by observing the site stereoscopically.
There are a number of different types of recording photographs:
1. Photographs of small-scale details showing groups of artifacts or sections of structure
2. Survey photographs showing the topographical relationships between groups of artifacts
3. Photomosaics which are used to show large areas that cannot normally be covered in a single photograph
4. Photogrammetry which enables accurate measurements to be made from the photographs
5. Stereophotogrammetry in which accurate measurements are made from stereophotographic pairs
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