The selection is made by evaluating the articles in the journal PFG of the previous year and is made jointly by a committee of the DGPF and Hansaluftbild. This year, the award was made in Munich on March 22, 2023, for an article on a very specific topic in photogrammetry.
Last year, there was a disproportionate number of articles in the PFG on the topic of water. Hansa Luftbild is no stranger to this topic either. However, while we continue to deal with data acquisition from the air in order to make meaningful contributions to coastal protection on the North Sea, dike surveys of the Oder and Elbe rivers or the laying of power lines on the East Frisian islands by means of image and laser data, many authors of the PFG go below the water surface.
Here, too, imaging systems and laser systems are used and - what a surprise - the laws of photogrammetry also apply under water, just as they do on land and in the air. Of course, with specific peculiarities, because the optical medium "water" poses a special challenge. In the meantime, the term "multi-media photogrammetry" has emerged in the photogrammetric literature. The future practical use of the three-dimensional recording and modeling of objects under water will be immediately apparent to everyone with keywords such as submarine cables, gas pipelines and mineral resources.
The 2023 Hansa Luftbild Prize also recognizes an achievement in this field. The article describes the accuracy analysis of an oblique underwater laser triangulation system. By simultaneously using a green laser and a camera, flexible and accurate underwater measurements were made. The particular challenge, of course, was in the geometric modeling of the refractions when the light at the interfaces was from air to glass and from glass to water. The measurement and calibration methods presented in the article greatly impressed the jury.
The Hansa Luftbild Preis 2023 went to the authors Mr. Hannes Sardemann, Mr. Christian Mulsow and Mr. Hans-Gerd Maas for their paper "Accuracy Analysis of an Oblique Underwater Laser Lightsheet Triangulation System" published in issue 1/2022 of PFG. Mr. Sardemann accepted the award.