Richard THOMA
(ARDIG – Archäologischer Dienst GesmbH, St. Pölten, Austria)
Keywords: SFM 3D photos documentation visualisation
Abstract:
SFM – Structure from Motion
This method provides accurate and comprehensive 3D documentation of any object. Only photos taken at different angles are necessary. Scale does not matter, from a small find to large mining areas SFM can be the adequate choice of documentation. Due to the highly detailed 3D content many forms of visualisation are offered.
Taking photos:
Depending on the structure of the surface, objects can be calculated based on 15 to 50 photos. To allow georeferencing, control points should be visible. DSLR with low distortion lens should be considered for best results.
Georeference:
Marked and surveyed control points allow georeferencing and also increase the internal accuracy of the model.
Data export:
In addition to the implementation in AutoCAD, the export for GIS or 3D printing stations is also possible. 3D-PDF ensures rendering without additional, proprietary software.
Advantages:
Necessary equipment such as camera and total station are already available at most archaeological excavations
Low additional costs on site – adding most detailed information of the object
If enough images are available, even destroyed objects from the past can be documented in hindsight
Disadvantages:
Powerful workstation recommended
Large storage space for raw data in highest resolution