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Additional benefits include the ability to integrate with high frequency imaging sonars. In low visibility conditions, sonar footage can be overlayed with images, or in some cases, used alone to create a photogrammetric model.
Contact an Industry Specialist to Learn More about ROVs for 3D Modeling
The pair stated that they were able to conduct the underwater survey much quicker than usual. Noting that “normally if we had divers down, we as the archaeologists would instruct them what to be looking for what to record and then they would come back up and kind of inform us what they've seen”. In a single afternoon, the team was able to capture all the imagery needed to move onto the second stage; modeling.
Once the necessary imagery was captured, Mike and Darren were able to upload their findings, alongside some previous side-scan sonar footage to generate photogrammetric models. The software used was ‘Agisoft Metashape’. Agisoft Metashape is a stand-alone software product that performs photogrammetric processing of digital images and generates 3D spatial data to be used in GIS applications, cultural heritage documentation, and visual effects production as well as for indirect measurements of objects of various scales.
The figure above demonstrates the capabilities of precise measurements found in the modeling capabilities. The images captured were able to render completely interactive models down to millimetric accuracy. Once finalized, Stantec was able to compare the photogrammetric renderings against historical documents to track the impact of environmental factors over time.
Deep Trekker’s rotating camera heads enable operators to rotate between 220 and 270 degrees. This allows for extremely smooth and consistent imaging since the pitch of the ROV requires no adjustment for downward facing photographs. During Stantec’s survey, they were able to easily capture ‘aerial’ positioned photos, as well as adjust the rotation for complex sections as needed.
Accessing the deployment site required the team to navigate across a system of narrow walkways. Thanks to Deep Trekker’s battery operated ROVs and handheld controller, there was no need to travel with external generators or control consoles. This drastically increases the maneuverability during remote surveys, as well as allows for convenient air travel as checked luggage.
Utilizing Deep Trekker’s in-house BRIDGE software, the ROVs are incredibly intelligent at station holding through currents. With auto-depth and auto-heading capabilities, piloting and capturing consistent images is extremely intuitive. At Nassau Mills Dam, the current was substantial, however the PIVOT and REVOLUTION ROVs were able to smoothly navigate through the required grid pattern.
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