Photogrammetry

Photogrammetry is the practice of determining geometric properties from photographic images. This technology is used in a variety of fields including; manufacturing, power, equipment design, engineering, construction, architecture, and archeology. We utilize the Aicon, DPA Measurement System.

The applications for this technology are numerous. Points, shapes, curves, angles all can be mapped and measured effectively. The process for collecting photogrammetric measurements starts by applying a series of reflective markers on an object. This creates accurate predetermined reference points of a certain distance in each photo. Utilizing a camera with a fixed focal length coupled with specialized software can then determine a very refined distance between any two points.

Aside from making detailed computer renders of artifacts for analysis and study, Close Range Photogrammetry (CRP) is especially useful with the delicate nature of handling artifacts. At the Warren Lasch Conservation Center, we utilize this technology primarily in the precise measurement of the artifacts that we work on. Not only for the accurate determination of the size of a historic object - whether a small coin, or a large building, but also during conservation when we can monitor shape for deformation. By taking a series of photographs before and during a move, we can look for the smallest changes in distance between the reference points.

Primary Benefits:

• The technique is non-intrusive to the objects.
• Photographs may be archived for later use.
• The photographs may be used either for monitoring or for the generation of data.
• A high level of accuracy is achievable.
• The digital nature greatly enhances flexibility.
• It is cost-effective.