LiDAR Scanner
A LiDAR scanner measures distance by timing pulses of laser light, firing hundreds of thousands of pulses per second to build a dense 3D point cloud of terrain, buildings or excavations. Because it records geometry rather than photographs, it captures shape, volume and clearance directly, in daylight or darkness.
Millions of measured points instead of a handful - LiDAR is how a site becomes a model you can measure anywhere, later, without going back.
ALSO CALLED: 3D laser scanner · handheld LiDAR · SLAM scanner · terrestrial laser scanner · point cloud scanner · laser scanning survey
Typical specifications
Class-level figures. Individual models vary, so treat these as the range to check a quotation against rather than a guarantee.
- What it measures
- 3D coordinates (X, Y, Z) of every surface in line of sight
- Typical point rate
- 100,000 – 2,000,000 points per second, model dependent
- Typical relative accuracy
- Millimetres to a few centimetres, depending on grade and range
- Typical range
- Handheld/SLAM units tens of metres; tripod scanners hundreds of metres
- Common output
- LAS / LAZ / E57 point cloud, mesh, DEM, sections, AutoCAD DWG
- Works in darkness
- Yes - it supplies its own light source
How a lidar scanner works
01
Pulse and time
The scanner emits a laser pulse and times its return. Time multiplied by the speed of light gives distance to that surface, to within millimetres.
02
Sweep and record
A rotating mirror or spinning head sweeps the beam across the scene, recording an angle pair with every distance so each return becomes a 3D point.
03
Position the scanner
Tripod scanners are tied to survey control; handheld SLAM units track their own motion as you walk, so the cloud stays coherent without setting up stations.
04
Register and clean
Overlapping scans are aligned into one coordinate system, noise and moving objects removed, then the cloud is georeferenced against GNSS control points.
05
Extract the deliverable
Sections, contours, volumes, floor plans, clash checks or a mesh are pulled out of the cloud - the same scan answers questions asked months later.
What it is used for
- As-built records of buildings, plants and heritage structures
- Quarry and stockpile volume measurement
- Bridge, tunnel and retaining-wall condition capture
- Road corridor and cross-section extraction
- Complex sites where a total station would need hundreds of shots
- Interior floor plans where GNSS has no signal
- Slope, cliff and landslide monitoring over repeat visits
- Deformation checks by comparing two clouds taken months apart
Who uses it
- Civil contractors
- Architects and conservation teams
- Quarry and mine operators
- Infrastructure consultants
- Government departments
- Facility and plant owners
How to choose a lidar scanner
Handheld/SLAM or tripod?
SLAM units cover ground fast and reach cluttered interiors; tripod scanners give tighter accuracy from fixed stations. Speed versus precision is the real decision.
Accuracy you actually need
Volume estimates tolerate centimetres. Structural and fabrication work does not. Paying for millimetre accuracy you will never use is the most common overspend.
Range versus site size
Range decides how many setups a site takes. On open quarries a longer-range scanner can halve the field days; indoors it makes little difference.
Processing, not just capture
The scanner is half the cost of ownership. Point-cloud software, a workstation that can hold the cloud in memory, and someone trained to register scans matter as much.
Deliverable format
Confirm the scanner's output opens in whatever your consultant uses. E57 and LAS are the safe interchange formats; proprietary-only output creates a dependency.
What it costs
LiDAR is priced by area, site complexity and the deliverable, not by the day - a bare point cloud costs far less than registered scans turned into drawings. Access, vegetation, the number of setups and whether survey control already exists are what move the figure most. To confirm: LiDAR survey rate bands and scanner purchase price ranges
LiDAR Scanner vs the alternatives
LiDAR Scanner vs Total station
A total station gives you the few hundred points you chose. LiDAR gives you every point and lets you choose afterwards. For a boundary, use the total station; for a shape, use LiDAR.
Read about total stationLiDAR Scanner vs Drone photogrammetry
Drones cover open ground faster and cheaper. LiDAR sees under tree canopy and inside structures, and does not need good light or texture to work.
Read about drone photogrammetryWhat Axisline does with a lidar scanner
FAQ
LiDAR Scanner - common questions
What is LiDAR used for in surveying?
LiDAR is used to capture the full 3D shape of a site quickly - terrain, buildings, quarry faces, road corridors and building interiors. Surveyors use it wherever the geometry is complex or the site is unsafe to walk in detail, then extract contours, sections, volumes and as-built drawings from the resulting point cloud.
How accurate is a LiDAR survey?
Relative accuracy is typically millimetres to a few centimetres depending on scanner grade, range and how scans are registered. Absolute accuracy - how well the cloud sits on real-world coordinates - depends on the GNSS or total-station control tied to it, which is why control survey is done alongside the scan rather than skipped.
Is LiDAR better than drone mapping?
Neither is better outright; they answer different questions. Drone photogrammetry is faster and cheaper over open ground and produces imagery. LiDAR penetrates vegetation, works indoors and in darkness, and measures geometry directly. Large projects often use both - drone for the corridor, LiDAR for the structures and vegetated sections.
How long does a LiDAR scan take on site?
Field time is usually a fraction of the project time. A handheld SLAM unit can walk a building or a quarry bench in under an hour, while a tripod scanner needs several minutes per setup. Registration, cleaning and drawing extraction in the office typically take longer than the capture itself.
What files do I get from a LiDAR survey?
Standard deliverables are a registered point cloud in LAS, LAZ or E57, plus whatever was extracted from it - AutoCAD DWG plans and sections, contours, a DEM, volume reports or a mesh. Ask for the raw cloud as well as the drawings; it lets future questions be answered without a return visit.
Do you provide LiDAR scanning across Kerala?
Yes. Axisline Geo Services covers all 14 districts of Kerala for LiDAR 3D scanning, and equipment supply reaches clients pan-India. Field crews travel with their own control equipment, so sites without existing survey control can still be tied to real-world coordinates on the same visit.
Related instruments
Need a lidar scanner - or the survey it produces?
Supply, calibration and service across Kerala and pan-India, with field crews covering all 14 districts.