UAV, Photogrammetry and LiDAR Surveying Services
Road & Civil Surveys operates UAV and LiDAR capture across road, rail, water and energy corridors in New South Wales and Queensland. We fly and process the data ourselves, so the team that plans the capture is the same team that observes the ground control and hands over the model. Working from Gregory Hills in south west Sydney and Bundall on the Gold Coast, we support corridor and infrastructure projects where the site is too large, too busy or too hazardous to walk.
Capture Methods We Work With
Not every site suits the same sensor. The right method depends on the surface you need to measure, what is growing over it, the accuracy the design calls for, and how much of the corridor has to stay open while you capture it. We select the method against the deliverable, not the other way around.
UAV photogrammetry. Overlapping high-resolution imagery flown in a grid and processed into an orthomosaic, a digital surface model and a point cloud. Best on open ground: earthworks, stockpiles, pavement, batters and greenfield sites. It also gives you a true-colour record of the site on the day, which makes it the most useful method for progress reporting and for settling variations.
UAV LiDAR. An active laser sensor flown on the same airframe. Because the pulse finds gaps in vegetation, LiDAR returns ground level under grass, scrub and light canopy where photogrammetry only sees the top of the growth. This is the method for corridor design surfaces, drainage and flood work, and any site where vegetation would otherwise force a walked detail survey.
Mobile LiDAR. A vehicle-mounted scanner that captures a road corridor at traffic speed. It keeps people off a live carriageway and covers kilometres in a shift rather than days, which suits road asset capture, pavement surfaces and utility corridor design.
Terrestrial laser scanning. A tripod-mounted scanner for detail that aerial capture cannot resolve: bridge soffits, structures, plant rooms, tunnels and confined spaces. Often scanned and flown on the same visit so the structure and its surrounds sit in one registered dataset.
Aerial inspection. Close visual capture of structures that would otherwise need an elevated work platform, rope access or a road closure. High-resolution stills of bridge bearings, headstocks, culverts and slopes, captured from the air with position data attached.
How a UAV Survey Runs
Every capture follows the same sequence, whether it is a single structure or forty kilometres of corridor.
Planning and approvals
We confirm the deliverable and the accuracy the design requires, then plan the flight around it: sensor, altitude, overlap and line spacing. Airspace is checked and any approvals, landowner notifications and site inductions are arranged before the crew mobilises.
Ground control
Survey control is established and observed on the ground before the aircraft flies. This is the step that makes the data usable, because without checked control tied to project datum a point cloud is a picture rather than a survey. We place and observe targets across the site and hold independent check points back from the adjustment.
Capture
The crew flies the planned mission and captures the imagery or laser data, plus any ground detail the sensor cannot see: obscured invert levels, kerb returns, points under structures. Coverage is reviewed on site so gaps are re-flown that day rather than found in the office a week later.
Processing and delivery
Data is processed, georeferenced and checked against the independent control. We report the residuals so you know what the data is worth, then deliver in the format your team already uses, whether that is a CAD surface, a classified point cloud, an orthomosaic or a model for the digital engineering team.
When to Use LiDAR Instead of Photogrammetry
Both methods produce a three-dimensional surface, and on bare open ground they produce a very similar one. The difference is what happens when something sits between the sensor and the ground.
Photogrammetry measures what the camera can see. Over grass, scrub or canopy it models the top of the vegetation, not the surface underneath. On a bare earthworks pad or a finished pavement that is not a problem, and photogrammetry gives you better colour, better visual context and a lower cost per hectare.
LiDAR sends a pulse that can find gaps in vegetation and return the ground beneath it. On a vegetated corridor, a table drain, a batter that has grassed over or a creek crossing, that is the difference between a usable design surface and one the designer has to throw away.
Cost and turnaround differ too. Photogrammetry is generally quicker to process and cheaper to fly. LiDAR carries a heavier sensor, more processing and more classification work, and it earns that cost on sites where vegetation or accuracy would otherwise put people walking the corridor.
In practice a lot of corridor work uses both: LiDAR for the ground surface, photogrammetry for the orthomosaic over the top. If you are not sure which your project needs, send us the design brief and the accuracy requirement and we will tell you.
Recent UAV and LiDAR Projects
We have flown and scanned across transport, water, energy and renewables projects in New South Wales and Queensland. A few examples:
- Motorway bridge aerial inspection and LiDAR survey, capturing bridge condition and geometry from the air without closing a lane.
- Slope remediation UAV LiDAR and photogrammetry survey, where vegetation over the batter ruled out a photogrammetry-only capture.
- Railway bridge aerial condition assessment, recording structure condition inside a live rail corridor.
- Road corridor mobile LiDAR survey for high voltage feeder design, capturing kilometres of live carriageway at traffic speed.
Each capture is planned around the deliverable the design team needs and the access the site allows.
What You Receive
The deliverable is agreed before we fly, because it determines how the capture is planned.
Typical outputs include a classified point cloud, a digital terrain or surface model, a georeferenced orthomosaic, contours and breaklines, cross sections and long sections, volume calculations against a design or a previous survey, and CAD-ready linework for the design team.
Every dataset is delivered on project datum with a control report showing what the data was checked against and the residuals achieved. If your project runs a common data environment or a federated model, we will match the naming, layering and file structure you already use so the data drops straight in.
Get UAV and LiDAR Capture on Your Project
If you have a corridor, a structure or a site that needs capturing, talk to Road & Civil Surveys. We will look at the accuracy your design calls for and the access and vegetation on site, then recommend the capture method that gets you a usable surface with the least disruption. We work from Gregory Hills in south west Sydney and Bundall on the Gold Coast, across New South Wales and Queensland. For everything else we do, see our full range of survey services.