Quite an upgrade. What made you decide to adopt photogrammetry as your main survey method, and would you recommend it to others in your field?
I find that photogrammetry is sufficiently accurate for the types of calculations you would need to do in a boat survey – such as identifying deformities, assessing stability and determining speed potential. At the same time, it’s a very versatile, convenient and adaptable method.
The most common alternative in my field is laser-based surveying, which requires the use of theodolites and specialized scanners. But not only is this a lot more expensive, it can also be impractical in many real-life maritime settings.
For example, a laser-based system requires the boat to be stationary, and for multiple pieces of equipment to be precisely repositioned each time you “capture” the boat from another angle. This is often impossible in a busy port.
With photogrammetry, I can simply move around the boat with a portable digital camera
and take pictures of the boat from any angle I want. This is especially helpful for surveying the inside of the boat, such as when I am doing a piping survey.
Another important benefit of photogrammetry is that it leaves behind a repository of photos. This makes it possible to verify the results with other photogrammetry software in case of any disputes about my model.
All in all, I would definitely recommend photogrammetry to other maritime surveyors looking for a robust, flexible method for 3D surveys.
Jean Sans is a veteran maritime surveyor with over 30 years of experience. A Judicial Expert at the Court of Appeal of Rennes and member of the National Chamber of Maritime Experts Plaisance, he is widely recognized as an expert in his field. To contact Jean or learn more about his work, visit his website at
www.experts-yachts.com.
The Report • December 2018 • Issue 86 | 79
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