The short answer
Drone LiDAR fires laser pulses that slip through gaps in vegetation to reach the ground, so it can model bare-earth terrain under tree cover that photogrammetry physically can't see. You get a classified point cloud, a bare-earth terrain model, and clean contours, the right tool for wooded sites and corridors.
A camera can only map what it can see, and over a wooded site that means the top of the canopy, not the ground you actually need. LiDAR solves that. It sends out laser pulses, and because some of them find gaps in the leaves and reach the dirt, it can reconstruct the bare earth beneath the trees.
That single capability, ground under canopy, is the whole reason LiDAR earns its higher cost. On open ground, photogrammetry is usually the better value. Under vegetation, LiDAR is often the only tool that works.
What you actually receive
How to read and use the data
Classification is what makes LiDAR useful
Raw LiDAR is just millions of 3D points. The value comes from classification: the software (and a human reviewing it) sorts each point into ground, vegetation, or structure. Strip away everything but the ground points and you have bare earth, the surface engineers actually design on.
When you review a LiDAR deliverable, the question to ask isn't 'how many points' but 'how clean is the ground classification,' because that's what your contours and terrain model are built from.
Point density and canopy decide how good the ground is
Denser, thick canopy lets fewer pulses through, so the ground model is only as good as the returns that reach it. Over heavy cover, expect a sparser but still usable bare-earth surface; over light brush, it's excellent. A good provider tells you up front what to expect for your specific site rather than promising perfection through solid forest.
Contours and DTM are the deliverables you build from
The bare-earth DTM and the contours generated from it are what drop into civil design and grading. They let you plan drainage, roads, and pads on land you couldn't otherwise see, without first clearing it just to survey it.
Is it worth it for your project?
Typical cost
LiDAR is quoted by scope: site size, canopy, and the deliverables you need. It costs more than photogrammetry because the sensor and processing are more involved, which is why we only recommend it when the site actually needs it. You get a fixed quote up front.
What to watch out for
- LiDAR sold by default for open ground. If there's no vegetation hiding the ground, photogrammetry usually does the job for less.
- Point clouds with no ground classification. The raw points aren't the product; the cleaned bare-earth surface is.
- Promises of perfect ground under dense, solid canopy. Physics limits how many pulses reach the dirt; an honest provider sets that expectation first.
Questions to ask any provider
- Is LiDAR actually necessary here, or would photogrammetry do the job?
- How is the point cloud classified, and is the ground classification reviewed by a human?
- What ground-point density should I expect under my site's canopy?
- What terrain deliverables do I get (DTM, contours), and in what format?
Frequently asked
What can LiDAR do that photogrammetry can't?
LiDAR can model bare-earth terrain under tree cover. Its laser pulses reach the ground through gaps in vegetation, while photogrammetry can only map the canopy surface it can see. That's LiDAR's defining advantage.
Is drone LiDAR worth the extra cost?
It's worth it when you need ground under vegetation, on wooded sites and corridors. For open ground, photogrammetry usually delivers similar accuracy for less, so we recommend LiDAR only when the site requires it.
How much does drone LiDAR cost?
LiDAR is quoted by scope (site size, canopy, deliverables) and costs more than photogrammetry. You get a fixed, all-in quote up front after we scope the site with you.
Blue Nose Aerial Imaging provides high-accuracy aerial mapping, measurements, and data. Our deliverables are not legal surveys and we are not a licensed land surveying firm. Where a project requires survey-grade certification, we coordinate with a partnered licensed surveyor.
Work with a pilot who treats your data like a flight plan
Tell us about your site and we'll send a fixed quote, no surprises.
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