Photogrammetry is a fascinating technique that uses photography to create accurate measurements and 3D models of physical objects and environments.
In a nutshell, the process consists of four main steps:
Data Acquisition: This is the first step, where photos are taken using cameras. The cameras used can be standard, metric (calibrated for photogrammetric applications), or even specialized cameras.
Data Processing: The photos are processed with specialized software. This software identifies common points between the photos and uses them to calculate the three-dimensional coordinates of surface points.
3D Modeling: The coordinate data is then used to construct a digital three-dimensional model. The texture from the photos can be mapped onto this model, creating a photorealistic 3D representation.
Analysis and Interpretation: The 3D data can be used for various analyses, such as volume calculations, inspections, and identifying features for maps.
Photogrammetry is found in a wide range of fields. The precision and versatility of this technique make it extremely suitable for:
- Surveying: It is used to create maps from aerial photographs.
- Architecture: For accurate measurements of buildings for documentation and construction.
- Engineering: For designing and monitoring projects.
- Manufacturing: To check the quality of products by comparing them to the original design.
- Forensic Investigation: To reconstruct crime scenes.
- Film and Games: To create digital models of objects, locations, or actors for visual effects or virtual environments.
- Environmental Studies: To study erosion, deforestation, and other environmental changes over time.
The information described already provides a good overview of how, where, and for what photogrammetry applications are used. As you may have already guessed, it offers various advantages.
Uiteraard zijn er uitdagingen in het proces om tot fotogrammetrische resultaten te komen. Welke kan jij al bedenken?
Thanks to advances in camera technology, the use of drones, and software algorithms, photogrammetry has become more accessible and user-friendly. It is a field that continues to develop with more applications in various sectors. An interesting development is that our smartphones are now equipped with computing power that was previously unimaginable, along with high-resolution cameras that are increasingly being used in the process. A tripod and one of the latest-generation smartphones are already enough to capture surfaces and objects.
Try using the Polycam tool – it’s easy to use and free:
https://poly.cam
https://learn.poly.cam/about
In addition to the photogrammetry described, we also name LiDAR technology, and it does not work quite the same but slightly more advanced with often even better and more specific results. See the next lesson.