Choose photogrammetry when you need true colour, fine texture, and low cost on well-lit, well-textured subjects; choose LiDAR when you need direct metric accuracy, long range, or the ability to see ground through vegetation. They solve the 3D problem differently — photogrammetry reconstructs geometry from photographs, LiDAR measures it with laser pulses — and the right answer depends on your subject, budget, and accuracy needs. Often the best choice is to combine them.

What's the fundamental difference?

The distinction is measurement versus reconstruction:

• Photogrammetry finds matching points across overlapping photos and triangulates geometry, inheriting the camera's full colour and texture.
• LiDAR fires laser pulses and times their return, recording precise distances directly — independent of surface texture or ambient light.

That single difference drives every trade-off below.

How do they compare head to head?

Factor	Photogrammetry	LiDAR
Geometry source	Reconstructed from images	Directly measured
Colour / texture	Excellent (the photos)	Limited / overlaid
Metric accuracy	Good with scale bars	Excellent, intrinsic
Featureless surfaces	Struggles	Handles well
Vegetation penetration	None (canopy only)	Yes (airborne)
Lighting dependence	High	Low
Equipment cost	Low (camera + software)	High (scanner)
Processing time	Significant	Faster to a point cloud

Which is more accurate?

For unconditional metric accuracy — especially at range or on plain, shiny, or low-texture surfaces — LiDAR wins because it measures distance rather than inferring it. Carefully controlled photogrammetry with certified scale bars can rival LiDAR on small, well-textured objects, but its accuracy degrades exactly where surfaces lack features or reflect light. If your tolerance is millimetric on difficult surfaces, LiDAR is the safer default.

Which captures colour and texture better?

Photogrammetry, decisively. Because appearance comes straight from the photographs, photogrammetric models carry crisp, high-resolution colour and surface detail. Many LiDAR units record only intensity or a coarser colour overlay from an auxiliary camera, so for visual fidelity — a carved inscription, a painted surface, a weathered facade — photogrammetry is the stronger record.

What about cost and accessibility?

Photogrammetry's entry cost is essentially a camera and free software, which is why it dominates among under-resourced heritage teams. Survey-grade LiDAR scanners are far more expensive to buy or hire, and demand more training. The honest trade-off: photogrammetry shifts cost from hardware to processing time and capture discipline, while LiDAR front-loads cost into equipment but is faster and more forgiving on site.

Can I combine them — and should I?

Frequently, yes. A common high-end heritage workflow registers both:

1. LiDAR scan        -> accurate metric backbone (geometry)
2. Photogrammetry    -> high-res colour + fine texture
3. Register/align    -> common targets or ICP
4. Drape photo texture over the LiDAR-controlled mesh

This gives survey-grade geometry with photographic detail — the best of both. Use shared targets visible to both sensors and report the alignment error.

How do I actually decide? A quick flow

1. Is the site forested or vegetated? -> Airborne LiDAR.
2. Do you need millimetric accuracy on plain/shiny surfaces? -> LiDAR.
3. Is colour and fine texture the priority? -> Photogrammetry.
4. Is budget tight and the subject well-textured and well-lit? -> Photogrammetry.
5. Do you need both accuracy and appearance? -> Combine them.
6. Whatever you pick, capture scale/control references and document them.

Key Takeaways

• Photogrammetry reconstructs geometry from photos and excels at colour and texture at low cost.
• LiDAR measures distance directly and excels at metric accuracy, range, and difficult surfaces.
• LiDAR is the safer choice for millimetric accuracy on plain or shiny surfaces; photogrammetry can rival it only on well-textured objects.
• Only airborne LiDAR can see ground beneath vegetation; photogrammetry sees the canopy.
• Photogrammetry trades hardware cost for processing time and capture discipline.
• Combining LiDAR geometry with photogrammetric texture often gives the best heritage record.
• Whichever you choose, capture and document scale or control references.

Frequently Asked Questions

What is the main difference between photogrammetry and LiDAR?

Photogrammetry derives 3D geometry from overlapping photographs and captures true colour and fine surface texture, while LiDAR measures distance directly with laser pulses and excels at metric accuracy and penetrating vegetation. One reconstructs from images, the other measures with light.

Which is more accurate, photogrammetry or LiDAR?

For raw metric accuracy at range and on featureless surfaces, LiDAR is generally more reliable because it measures distance directly. Well-controlled photogrammetry with good scale bars can match it on small, well-textured objects but degrades on plain or shiny surfaces.

Is photogrammetry cheaper than LiDAR?

Yes, usually. Photogrammetry needs only a camera and software, whereas survey-grade LiDAR scanners cost far more, so photogrammetry is the lower-cost entry point for most heritage teams. The trade-off is more processing time and sensitivity to surface and lighting conditions.

Can I combine photogrammetry and LiDAR?

Yes, and it is often the best of both: LiDAR provides an accurate metric backbone while photogrammetry supplies high-resolution colour and texture draped over it. Many heritage projects register the two datasets together for survey-grade geometry with photographic detail.

Which is better for capturing colour and texture?

Photogrammetry is better for colour and fine surface texture because it uses the photographs themselves as the source of appearance. Many LiDAR scanners capture only intensity or a lower-resolution colour overlay, so they are weaker for visual fidelity.

Which should I use for a forested archaeological site?

Use airborne LiDAR for forested or vegetated sites, because laser pulses can reach the ground between leaves and reveal earthworks hidden under canopy. Photogrammetry only sees the canopy surface and cannot recover the terrain beneath it.

Related reading

• How to Get started with photogrammetry
• Best Practices to Choose Metashape vs RealityCapture
• Photogrammetry of monuments
• When to Scale and align 3D models
• Multispectral imaging: an introduction