LiDAR vs Photogrammetry: Complete Comparison Guide
LiDAR and photogrammetry are the two dominant remote sensing technologies for creating 3D spatial data. This guide breaks down when to use each — and when combining both delivers the best results.
How LiDAR and Photogrammetry Work
LiDAR (Light Detection and Ranging) emits laser pulses and measures the time each pulse takes to return after reflecting off a surface. By recording millions of these measurements per second, LiDAR builds a dense 3D point cloud of the environment. Photogrammetry, by contrast, captures overlapping photographs and uses structure-from-motion (SfM) algorithms to reconstruct 3D geometry from 2D images. Both produce point clouds, but through fundamentally different measurement principles — active (LiDAR) vs passive (photogrammetry).
Accuracy Comparison
Both technologies achieve survey-grade accuracy when properly deployed. Terrestrial LiDAR scanners (Trimble X12, Leica RTC360) achieve ±2-4mm accuracy — optimal for interior scanning, BIM documentation, and engineering measurements. Drone LiDAR (DJI Zenmuse L3) achieves 1-3cm accuracy for aerial surveys. Drone photogrammetry matches or slightly exceeds drone LiDAR accuracy (1-3cm) for flat terrain with good texture, but degrades on vegetated, homogeneous, or reflective surfaces where feature matching struggles. For interior spaces, LiDAR is consistently more accurate.
- Terrestrial LiDAR: ±2-4mm (interior scanning)
- Drone LiDAR: 1-3cm vertical (aerial surveys)
- Drone photogrammetry: 1-3cm (with GCPs, good conditions)
- Photogrammetry struggles on: vegetation, water, snow, uniform surfaces
- LiDAR struggles on: highly reflective or transparent surfaces
Speed and Coverage
Photogrammetry covers large areas faster and cheaper. A drone photogrammetry flight can map 50-200 acres in a single session. LiDAR drone surveys cover similar acreage but produce denser point clouds under vegetation canopy. For interior scanning, terrestrial LiDAR is faster per room (2-minute scan cycle) but requires station-to-station movement. Mobile SLAM scanners (NavVis VLX3) can scan up to 30,000 sq ft per hour while walking through a facility.
Cost Comparison
Photogrammetry is generally more cost-effective for outdoor aerial surveys because consumer-grade drones with cameras can produce acceptable results. Professional photogrammetry flights cost $800-$3,000 per session. LiDAR requires specialized sensors that cost significantly more, making LiDAR surveys typically 1.5-3x the price of photogrammetry for equivalent area coverage. However, LiDAR eliminates the need for GCPs in many scenarios, reducing field setup time and total project cost for certain applications.
- Drone photogrammetry: $800-$3,000 per flight session
- Drone LiDAR: $1,500-$5,000 per flight session
- Terrestrial LiDAR: $0.20-$0.70 per sq ft for interior scanning
- Photogrammetry requires GCPs ($200-$500 setup cost per project)
- LiDAR may eliminate GCP requirement, offsetting sensor cost
When to Use Each Technology
Use photogrammetry for: construction progress monitoring, property marketing, topographic surveys of open terrain, facade documentation, and regular recurring flights where cost efficiency matters. Use LiDAR for: interior building documentation, scanning through vegetation canopy, working in low-light conditions, capturing dense geometry in complex MEP environments, and projects requiring guaranteed point density regardless of surface texture. Combine both when: you need interior and exterior coverage (LiDAR inside, photogrammetry outside), or when you need both geometric accuracy and photorealistic texture.
Key Takeaways
Both achieve survey-grade accuracy (1-3cm) when properly deployed
Photogrammetry: cheaper, produces photorealistic models, best for outdoor mapping
LiDAR: works in darkness, penetrates vegetation, consistent quality regardless of surface texture
Interior scanning: LiDAR is preferred (terrestrial or mobile SLAM)
Best practice: combine both for comprehensive indoor-outdoor documentation
Frequently Asked Questions
Is LiDAR more accurate than photogrammetry?
For interior scanning, yes — terrestrial LiDAR achieves ±2-4mm vs photogrammetry's ±5-10mm indoors. For outdoor aerial surveys, both achieve similar accuracy (1-3cm) when ground control points are used. LiDAR's main accuracy advantage is consistency — it delivers reliable results regardless of lighting, surface texture, or vegetation.
Is photogrammetry cheaper than LiDAR?
Generally yes. Drone photogrammetry costs $800-$3,000 per session while drone LiDAR costs $1,500-$5,000. However, LiDAR may reduce total project cost by eliminating GCP setup and delivering usable data through vegetation that photogrammetry cannot penetrate.
Can you combine LiDAR and photogrammetry?
Yes, and this is often the best approach. Many projects use terrestrial LiDAR for detailed interior scanning and drone photogrammetry for exterior and aerial coverage. The datasets are registered into a unified coordinate system for a complete indoor-outdoor 3D model.
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