[visionlist] Post doc proposal on "Assessing the sensibility of intervisibility on the quality of 3D geometry" at IGN-F/Lastig

[Bruno Vallet]

Post Doc title: 

Assessing the sensibility of intervisibility on the quality of 3D geometry 




Keywords: Intervisibility, 3D reconstruction, computational geometry, digital twin 




Supervision: 

    * 

Supervisor: Bruno Vallet (LASTIG, IGN) 
    * 

Co-supervisor: Teng Wu (LASTIG, IGN) 





Hosting Laboratory: 

LASTIG Lab, IGN/ENSG, Champs sur Marne, France 
Duration and start date: 1.5 years starting beginning of 2025 

Topic: 
Intervisibility is one of the application areas of 3D scene modeling, which consists of answering the question “Which points, which objects can be seen from which point?”. It is a useful technique in application fields such as security and defense, real estate, simulation of physical phenomena, antenna placement, etc. 

Modeling 3D scenes from various data sources is a subject widely studied by the scientific community. At IGN, the main data sources used are optical imagery and Lidar, acquired from terrestrial, aerial and space platforms. Depending on the data used and the reconstruction techniques, the quality of the modeling varies greatly. In the best case, the reconstruction method provides a more or less reliable indication of the geometric quality. In all cases, we can evaluate the quality externally by comparing the reconstruction to a ground truth known to be of much better quality. However, these evaluations are based on generic measurements not always adapted to the concrete use of 3D models. 

The objective of this post-doc thesis is to develop a methodology to evaluate the sensitivity of intervisibility to the quality of the 3D geometric representation used to calculate it. 
The geometric representations that we can use will be: 
-Digital surface models, where the geometry is represented by a given height per pixel of a regular grid covering the area of ​​interest 
-3D surface meshes, where the geometry is represented by a set of contiguous triangles, and ideally waterproof. 
-Structured models like LoD1 or 2 of the CityGML standard where each object in the scene has its own representation. 

Full description : [ https://www.umr-lastig.fr/lastig_data/pdf/2024-PostDoc-Intervisibility.pdf | https://www.umr-lastig.fr/lastig_data/pdf/2024-PostDoc-Intervisibility.pdf ] 
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