The short answer
Drone LiDAR is the best tool for capturing ground under vegetation, but it is not universal – part of using it well is knowing when not to.
Its main limitations: it costs more than photogrammetry (so it is wasteful on open, bare ground), it captures geometry rather than photographic colour, near-infrared LiDAR cannot map submerged surfaces, it still relies on ground control for survey-grade accuracy, and the point cloud needs skilled classification to be useful. Here is each limitation in plain terms, and what we do about it.
1. It costs more than photogrammetry
LiDAR sensors cost multiples of a photogrammetry camera, and the processing workflow is more involved – which is why a drone LiDAR survey in Ireland typically runs €1,500–5,000 for sites under 50 acres, against a lower figure for photogrammetry. On open ground with good visibility, photogrammetry delivers comparable ±5 cm accuracy for less. LiDAR earns its premium only where the ground is hidden – forestry, scrub, corridors – or where you specifically need bare-earth data through cover. If your site is a bare field or a stockpile yard, LiDAR is usually the wrong spend.
2. It records geometry, not photographic detail
A LiDAR point cloud carries position and intensity, not true photographic colour. For visual tasks – identifying a cracked slate, reading a serial plate, documenting a defect – you want high-resolution imagery, not laser returns. This is why we usually fly LiDAR and photogrammetry together on corridor and inspection work: the LiDAR gives the bare-earth model, the imagery gives the visual context and an orthomosaic. LiDAR alone answers “what shape is the ground?”, not “what does it look like?”.
3. It cannot see through water
The near-infrared laser in a standard survey sensor like the Zenmuse L2 is absorbed by water, so it does not map submerged riverbeds or lake floors – that requires specialist bathymetric (green-wavelength) LiDAR. Wet, standing water and very shiny surfaces also return fewer points. For channels, tidal zones and drainage, we plan flights around water levels (as we did on a Shannon-estuary survey flown at low tide) and pair LiDAR with other methods where the bed itself is needed.
4. Very dense low growth still limits ground returns
LiDAR penetrates canopy because some pulses find gaps between leaves and reach the ground – the L2 records up to five returns per pulse for exactly this reason. But that depends on gaps existing. Extremely dense, low, ground-hugging growth (thick gorse, dense young conifer) can leave sparse ground points, and classification cannot invent data that was never captured. On the hardest sites we increase point density and overlap, but we will tell you honestly when cover is too thick for a clean bare-earth surface.
5. It still needs ground control
LiDAR is not a substitute for good survey control. To deliver absolute survey-grade accuracy in ITM (EPSG 2157) with Malin Head heights, we still establish ground control points and independent check shots – that is what lets us state ±5 cm as standard, or ±2 cm with dense control. A LiDAR cloud floating on RTK alone, with no checks, is not a verified survey.
6. The data needs skilled processing
A single mission can produce tens of millions of points. Turning that into a clean bare-earth DTM means classifying ground from vegetation and structures, removing noise, and extracting breaklines – it is not a push-button export. Poor processing produces a lumpy surface with vegetation left in the “ground” class. The sensor is only half the job; the classification is the other half, and it is where experience shows.
7. It does not draw legal boundaries
LiDAR captures topography, not legal property boundaries. Cadastral and Land Registry-compliant boundary maps in Ireland are the work of a registered surveyor – see can a drone survey replace a land surveyor? for where the two roles meet. Drone LiDAR is a superb topographic and volumetric tool; it is not a boundary determination.
When LiDAR is still the right call
None of this makes LiDAR “bad” – it makes it specific. When the ground is under vegetation, on a live corridor, or across terrain a crew cannot safely walk, LiDAR does what nothing else can, delivered in 48 hours in your CAD coordinate system. The skill is matching the method to the site. If you are not sure, send us the site and we will tell you which method fits – including when it is not LiDAR.
Not sure which approach fits your site?
Send us the site boundary and the deliverables you need – we’ll come back with a methodology and a fixed price within 24 hours.
Request a 24-Hour Quote →Frequently asked questions
Is drone LiDAR always more accurate than photogrammetry?
No. On open, bare ground both achieve ±5 cm. LiDAR’s advantage is not raw accuracy – it is the ability to reach the ground through vegetation, where photogrammetry cannot see at all.
Can drone LiDAR map underwater?
Not with a standard near-infrared sensor like the Zenmuse L2 – water absorbs the laser. Mapping submerged surfaces needs specialist bathymetric LiDAR. We plan around water levels and pair methods where the bed is required.
Does LiDAR work in rain or fog?
Heavy rain, fog and snow scatter the laser and degrade the data, so we fly in suitable conditions. This is a practical operational limit, not a data-quality shortcut we would take.
Do I still need ground control with LiDAR?
Yes, for verified survey-grade output. We place ground control points and independent check shots to confirm ±5 cm (or ±2 cm with dense control) in ITM (EPSG 2157).
When should I choose photogrammetry instead?
When the ground is open and visible, when you need photographic detail or a true-colour orthomosaic, or when budget matters and vegetation is not in the way. See our LiDAR vs photogrammetry guide.