AUS-ROV engineers have developed a proprietary semi-automatic sonar image mosaicking methodology that represents a significant advancement in subsea acoustic imaging — most notably in its elimination of the dependency on navigational positioning data that constrains conventional mosaicking approaches. Raw sonar imagery is systematically extracted as discrete frames and subjected to precision alignment within a GIS environment, where a purpose-configured stitching and blending algorithm processes the full image sequence into a single, seamless, and radiometrically consistent mosaic. The resulting composite is then georeferenced against existing engineering plans or orthophotographic base layers, anchoring the acoustic data within an accurate and queryable spatial framework. This methodology delivers a level of detail and spatial continuity that allows engineers and asset managers to confidently identify, classify, and map subsea features — including structural anomalies, sediment accumulation, scour, and man-made objects — with a degree of precision that discrete sonar frames alone cannot provide. A key operational advantage of this system is its temporal analytical capability; multiple mosaics captured across successive survey campaigns can be stacked and compared, enabling rigorous change detection and long-term condition monitoring of subsea assets and environments. Further enhancing its utility, the mosaicked data can be vectorised to extract discrete features of interest, significantly improving interoperability across GIS, engineering, and asset management software platforms and facilitating seamless integration with the broader workflows of hydrographic, civil, and subsea engineering disciplines.

Bathymetry is the systematic measurement and mapping of underwater topography, providing the subsea equivalent of terrestrial elevation mapping and forming a foundational dataset for a wide range of marine engineering, environmental, and commercial applications. AUS-ROV employs the Norbit iWBMS multibeam sonar system to conduct high-resolution bathymetric surveys, an instrument renowned in the hydrographic industry for its exceptional swath coverage, angular resolution, and integrated water column profiling capability. Unlike single-beam systems that capture only a narrow depth profile directly beneath the vessel, multibeam technology simultaneously acquires hundreds of depth soundings across a wide swath, producing dense, georeferenced point clouds that render the seafloor in precise three-dimensional detail. This data underpins a broad spectrum of critical applications — from the identification of submerged hazards, seamounts, and reef structures for safe navigation and maritime charting, to the engineering assessment of subsea cable routes, offshore oil and gas infrastructure, and seabed pipeline corridors. Bathymetric surveys are equally integral to search and recovery operations involving missing vessels, aircraft, or man-made objects on the seafloor, where accurate terrain modelling can significantly reduce search area and operational cost. Australia's commercial fishing industry further relies on bathymetric data to identify productive deep-water habitats and target species-specific bottom conditions. The survey of a rockwall embankment presented in the image above was acquired by AUS-ROV using the Norbit iWBMS, illustrating the resolution and spatial fidelity that modern multibeam technology delivers.

AUS-ROV has developed a proprietary system for high-resolution 3D modelling of the internal geometry of pipelines, tunnels, and subsea conduits, purpose-built to meet the demanding inspection requirements of industries where structural integrity is critical. At the core of this capability is the integration of mechanical scanning sonar directly into our ROV platform — a technology that emits acoustic pulses across a 360-degree rotational sweep to capture precise distance measurements at defined angular increments, generating dense point-cloud data that is then processed into accurate, dimensionally reliable 3D models. Unlike optical inspection methods that are rendered entirely ineffective by turbid or zero-visibility water conditions, mechanical scanning sonar operates independently of water clarity, making it the definitive solution for confined, submerged environments where visual assessment is not possible. This system has been deployed across a broad spectrum of critical infrastructure sectors, including water and wastewater conveyance systems, oil and gas transmission pipelines, mine dewatering tunnels and adits, and marine outfall structures. The resulting 3D models provide engineers and asset owners with quantifiable data on bore profile, deformation, ovality, sedimentation accumulation, and structural anomalies — enabling condition assessment, remaining-life analysis, and rehabilitation planning to be conducted with a level of confidence and spatial accuracy that traditional inspection techniques simply cannot achieve.