What is photogrammetry?
Photogrammetry is the technique of extracting dimensional data
from one or more photographs using trigonometric triangulation.
It also enables the generation of computer-based 3D models from
The program used by Hunarch Consulting is Photomodeler
Why use photogrammetry?
1. Photogrammetry enables measurements to be derived from photographs.
But why use photos?
- Scenes and objects might be too complex, or inaccessible, or both
for measurement by other means.
- Photography is a very quick recording method for later data analysis:
important if there is insufficient time for measurement by other
- Photographic records (e.g. from 35mm, digital or video cameras)
may be the only source of information available.
- Enables measurement extraction and image analysis for an indefinite
period after the initial recording.
- Preserves a record of orginal conditions after changes have occurred.
- Photographic recording avoid or minimises the risk of contamination
of the scene: important for evidentiary applications.
2. Photogrammetry enables "real-world" rotatable 3D computer
imaging. But what is the advantage of this?
- Compared with computer generated rotatable 3D renderings, complex
scenes or objects can be modeled much more quickly.
- The preservation of the original photographic record in the model
may have greater credibility and may be valuable for evidentiary
Crime scenes; accidents; structural failures; effects of natural disasters.