Merging acoustic and optic underwater survey

This is a short presentation of the rov3D results, using multi scale underwater photogrammetry and merging acosutic survey. Several application are alredy done in marine biology, archaeology, industry...

The consortium consists of an organization of academic research, LSIS laboratory, and of two industrial partners, COMEX and SETP. COMEX is skilled in underwater scouting and outdoor engineering, whereas SETP is skilled in dimensional control by photogrammetry and topometry.

The project’s goal is to develop automated proceedings of 3D surveys, dedicated to underwater environment, using acoustic and optic sensors. The acoustic sensor will allow acquiring a great amount of low resolution data, whereas the optic sensor (close range photogrammetry) will allow acquiring a low amount of high resolution data. From these two surveys, a high resolution numeric structure build 3D modeling of large complex scenes will be proposed to final users, with the production of different type of outputs (SIG 3D, MNT, Mosaic, …). These models can be analyzed and compare at any time and can be used to study sites or landscapes’ evolution in time.

In practice, a 3D acoustic scanner will make a large scan of the scene to model, and an optic system will make the high resolution photogrammetric restitution of the different areas in the scene. While our software tools will do the automatic registration of both data sources, other algorithms, developed during the project, will recognize and model objects of interest. Eventually, these data will allow us to establish objects’ symbolic representation and their geometry in a precise virtual facsimile, responding to the partners’ need in documentation.

The ability to measure and model large underwater sites in a short time opens up many scientific challenges such as image processing, multimodal adjustment, land visualization and offers new opening to marine biology, underwater archaeology and underwater industry (offshore, harbour industry, etc.).