SUBSEA SERVICESUSV & 3D seabed surveys
Compact surface-vessel surveys using 3D sonar and RTK positioning. Map marinas, berths, hydro reservoirs and shallow-water infrastructure.
Point clouds · Bathymetric surfaces · Contours
NEW ZEALAND · SUBSEA SURVEY & INSPECTION
See beneath.
Measure with
confidence.
ROV inspections, USV surveys and subsea 3D photogrammetry. Practical field expertise, backed by datasets your engineers can use.
Based in Nelson and Whangārei. Mobilising across New Zealand and internationally.
From underwater imagery
to measurable geometry.
to measurable geometry.
ROV inspectionUSV survey3D photogrammetryGeoreferenced datasetsMetrology
01 / CAPABILITIES
The right view.
The right measurements.
From a close visual inspection to a georeferenced seabed model, we plan the capture around the decisions you need to make.
ROV inspections
Visual and sonar-assisted inspection of subsea assets, piles, pipelines, mooring systems, hydro dams and reservoir infrastructure, with recorded evidence for engineering review.
Inspection footage · Asset observations · Reporting
Subsea photogrammetry
Stereo image capture and 3D reconstruction to document asset condition and geometry. In-field coverage review supports an efficient survey campaign.
Textured models · Detailed geometry · Repeat surveys
Metrology & measurement
Chain dimensioning, line orientation, flange and spool geometry, and structural measurements. Survey control and measurement uncertainty are defined for each scope.
Dimensions · Orientation · Measurement reports
ROV cleaning
Targeted subsea cleaning to expose inspection areas and support maintenance. Tooling, access and the cleaning method are matched to the asset and project conditions.
Inspection preparation · Targeted intervention
Technical & operational support
ROV maintenance, system integration, training, campaign supervision, project management and client representation.
Operational readiness · Experienced support
MARINE ENVIRONMENTAL PROGRAMMES
Marine Environmental Surveys & Research Support
ROV NZ provides subsea data acquisition and survey capability to support marine environmental assessment, research and monitoring programmes. Our ROV and USV platforms can acquire georeferenced imagery, 3D bathymetry, photogrammetry and repeatable spatial datasets for seabed and habitat assessment, environmental baseline surveys and change monitoring.
We work alongside environmental scientists, research organisations and specialist consultants to integrate subsea survey data into wider environmental programmes.
02 / PROJECT EVIDENCE
Real projects.
Useful results.
A closer look at the capture methods, measurements and deliverables behind our survey capabilities.
USV SURVEY / SEPTEMBER 2026
Mapping the seabed at Okara Marina
A BlueBoat USV with Cerulean OmniScan 450 3D sonar captured overlapping scans of the marina manoeuvring area, supported by dual-antenna RTK GNSS.
14.7mraw sonar observations
20cmdelivered contour interval
Survey method & deliverables
Coverage planning, overlapping sonar capture, quality review, point-cloud filtering and surface generation.
- Filtered and raw LAS point clouds
- GeoTIFF bathymetric terrain model
- DXF contours and OBJ surface mesh
Reported point spacing was 3.40–4.19 cm across individual scans. Expected relative system accuracy was ±5 cm for this survey; this is distinct from GNSS precision.
PHOTOGRAMMETRY / ENGINEERING MEASUREMENT
17 subsea wells. A clear record for decommissioning.
As part of a major Australian oil and gas decommissioning project, ROV NZ surveyed 17 subsea wells using stereo imagery and 3D reconstruction to support engineering review.
Our wider metrology work includes mooring chain dimensioning, line orientation and spool project measurements.
17subsea wells surveyed
Applications & measurement context
The Australian decommissioning well campaign used Voyis Discovery Stereo with EIVA VSLAM coverage review and preliminary models produced offshore.
Our wider spool measurement work reported 3 mm relative feature accuracy and 30–50 mm absolute accuracy across larger distances in the featured campaign.
Deliverables include point clouds, textured models, annotated measurements and engineering documentation, as agreed.
MOORING CHAIN / 3D METROLOGY
From reconstructed geometry
to recorded dimensions.
Processed subsea models provide a record of mooring-chain geometry, with measurements placed directly on the reconstructed links for engineering review.
These examples show annotated link diameters, weld-area dimensions and dimensions across adjacent links.
Measurement context
Achieved chain measurement repeatability was approximately ±0.5 mm in the featured campaign. Repeatability is distinct from absolute accuracy; survey control and measurement uncertainty are defined for each project.
ROV CLEANING / PILE INSPECTION
Expose the surface.
Improve the inspection.
Targeted ROV cleaning removed marine growth from inspection areas on the pile. Pre-cleaning and post-cleaning imagery documents the visible change and provides a clearer view of the underlying surface.
These images show the pile before cleaning and the exposed inspection area after cleaning at −2 m.
03 / DELIVERABLES
Data that fits
your next step.
Coordinate systems, vertical datums, coverage and acceptance criteria are agreed before mobilisation. Deliverables are prepared for the software and engineering workflow you use.
Discuss your data requirementsGeoreferenced point clouds
LAS / E57 · Spatial review, modelling and measurement
3D surface & textured models
OBJ · Asset geometry and visual interpretation
Bathymetry & CAD outputs
GeoTIFF / DXF · Terrain surfaces and contours
Inspection & measurement records
Video, observations, drawings and agreed reports
04 / ROV NZ
Field experience.
Engineering focus.
We bring subsea operations and measurement together.
Based in Nelson and Whangārei, ROV NZ delivers subsea inspection, survey, engineering and operational support for New Zealand and international clients. We combine experienced ROV personnel with stereo imaging, sonar and positioning systems to build a clear picture of underwater assets.
Our work spans ports and marine infrastructure, offshore energy, hydro dams and reservoirs, water infrastructure, defence and research. We have completed underwater surveys for multiple clients with hydro dam and reservoir assets.
A survey approach built around your project
We select and integrate the ROV, sonar, imaging and positioning tools around your asset, site conditions and required deliverables. Our team manages survey planning, field acquisition, data processing and quality review.
Equipment supply, integration, training and ongoing support are also available.
LET’S TALK ABOUT YOUR PROJECT
What do you need
to see or measure?
Share the asset, location, scope and intended deliverables. We’ll help identify a practical approach.
info@rovnz.co.nz