What is LiDAR and how does it work on a drone?

LiDAR (Light Detection and Ranging) uses pulsed laser technology to measure distances with extreme precision. Mounted on a drone, the sensor fires millions of laser pulses per second while an onboard IMU and GNSS receiver georeference each return. The result is a dense 3D point cloud that accurately represents the terrain and objects below — even beneath tree canopy.

When should I choose LiDAR over photogrammetry?

Choose LiDAR when you need bare-earth terrain data under vegetation, when working in low-light conditions, or when millimetre-level accuracy is critical. Photogrammetry is often sufficient for open sites with good light. For vegetated areas, flood modelling, forestry, or power line corridor surveys, LiDAR is the superior choice because it penetrates canopy to map the ground surface.

What accuracy can I expect from a drone LiDAR survey?

National Drones' LiDAR systems achieve vertical accuracy of 2–3 cm and horizontal accuracy of 3–5 cm with ground control. Point densities typically exceed 100 points per square metre, providing highly detailed 3D models suitable for engineering design, volumetric calculations, and regulatory compliance.

Classified powerline LiDAR corridor showing conductors, structures, vegetation, and ground

LiDAR Surveys

High-precision laser scanning for accurate terrain modelling and infrastructure digitisation

Processed DJI L3 LiDAR point cloud of a transmission corridor in SmartData

LiDAR — Light Detection and Ranging

Light detection and ranging (LiDAR) employs pulsed laser technology to measure distances. National Drones integrates this with drone hardware to produce precise 2D maps and scale-accurate 3D models. The technology generates millions of 3D points per second, combining to form rich three-dimensional representations of target objects or areas. Using Inertial Measurement Units (IMU) and GNSS receivers, each data point becomes georeferenced.

Classified powerline structures retained through dense vegetation and terrain

Penetrating Vegetation Coverage

Unlike aerial photogrammetry, LiDAR penetrates dense vegetation, enabling accurate Digital Terrain Models (DTM) for areas partially or fully covered by trees. Ground-level readings become possible where traditional survey methods struggle, making it essential for forestry, environmental, and infrastructure projects.

LiDAR powerline corridor with conductor and clearance-analysis overlays

Infrastructure Digitisation

Point cloud data maps entire cities, assesses infrastructure, and verifies tolerances between planned and as-built construction drawings. Data streams through a browser-accessible cloud platform, eliminating on-site infrastructure needs and enabling stakeholder sharing across your organisation.

Key Applications

LiDAR clearance screening along a powerline corridor

Power Network Analysis

Identify vegetation encroachment threatening electricity infrastructure, measure power pole and tower lean angles, identify power line sag, and check conductor height.

DJI L3 corridor point cloud displayed by LiDAR intensity

Low-Light Data Capture

Unlike photogrammetry, LiDAR captures data in low or no-light conditions. The system mounts to either drones for wide-area coverage or vehicles for corridor scanning.

Powerline corridor point cloud coloured by terrain height

Digital Terrain Models

Produce accurate DTMs for areas covered by vegetation where traditional aerial photography cannot reach the ground surface.

LiDAR drone beside an electrified rail corridor

Corridor Scanning

Vehicle-mounted LiDAR for roads, rail corridors, and linear infrastructure with continuous high-resolution data capture.

Construction Verification

Verify tolerances between planned and as-built construction drawings with millimetre-precision point cloud data.

SmartData cloud dashboard showing inspection and mapping projects

Cloud-Based Delivery

Data streams through a browser-accessible cloud platform, eliminating on-site infrastructure needs and enabling remote stakeholder access.

Real Results

See how we have delivered for clients across Australia.

Infrastructure Engineering

Aurecon & Snowy Hydro

National Drones conducted comprehensive bridge inspections for Aurecon and Snowy Hydro, capturing high-resolution LiDAR and photogrammetry data across 38 bridges in NSW and ACT.

Precision from Above: Drone Inspections Elevate the Sydney Rail Network's Asset Safety and Integrity

Rail Infrastructure

Aurecon (on behalf of Sydney Trains)

National Drones and Aurecon inspected 3,818 rail assets across Sydney's network using drone photogrammetry and LiDAR, covering 438 kilometres of rail corridor.

View all case studies →

Frequently Asked Questions

What is LiDAR and how does it work on a drone?: LiDAR (Light Detection and Ranging) uses pulsed laser technology to measure distances with extreme precision. Mounted on a drone, the sensor fires millions of laser pulses per second while an onboard IMU and GNSS receiver georeference each return. The result is a dense 3D point cloud that accurately represents the terrain and objects below — even beneath tree canopy.
When should I choose LiDAR over photogrammetry?: Choose LiDAR when you need bare-earth terrain data under vegetation, when working in low-light conditions, or when millimetre-level accuracy is critical. Photogrammetry is often sufficient for open sites with good light. For vegetated areas, flood modelling, forestry, or power line corridor surveys, LiDAR is the superior choice because it penetrates canopy to map the ground surface.
What accuracy can I expect from a drone LiDAR survey?: National Drones' LiDAR systems achieve vertical accuracy of 2–3 cm and horizontal accuracy of 3–5 cm with ground control. Point densities typically exceed 100 points per square metre, providing highly detailed 3D models suitable for engineering design, volumetric calculations, and regulatory compliance.

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