LiDAR vs Photogrammetry: When to Use Each Technology

LiDAR vs Photogrammetry: A Technical Comparison

Both LiDAR and photogrammetry create 3D point clouds, but they work fundamentally differently and excel in different scenarios.

# How They Work

LiDAR (Light Detection and Ranging)
- Active sensor: Emits laser pulses and measures return time
- Works in any lighting condition
- Penetrates vegetation canopy
- Direct measurement of geometry
- Multiple returns per pulse (vegetation penetration)

Photogrammetry
- Passive sensor: Uses visible light imagery
- Requires adequate lighting
- Cannot penetrate dense vegetation
- Derives geometry from overlapping images
- Produces colorized point clouds inherently

# Accuracy Comparison

| Metric | LiDAR | Photogrammetry |
|--------|-------|----------------|
| Vertical accuracy | 3-5cm typical | 2-5cm typical |
| Horizontal accuracy | 5-10cm typical | 2-5cm typical |
| GCP requirement | Minimal | Essential for survey-grade |
| Accuracy consistency | Very consistent | Varies with conditions |

# Vegetation Penetration

This is LiDAR's defining advantage:

LiDAR:
- Multiple returns capture canopy AND ground
- Zenmuse L3: Up to 16 returns per pulse
- Essential for bare-earth DEMs under tree cover
- Works in dense forest environments

Photogrammetry:
- Only sees the visible surface
- Cannot penetrate even light vegetation
- Suitable for leaf-off conditions or cleared sites
- Works well for crop surface modeling

# Processing Considerations

| Factor | LiDAR | Photogrammetry |
|--------|-------|----------------|
| Field time | Faster per acre | Slower, more overlap needed |
| Processing time | Hours | Days for large datasets |
| Software cost | Specialized, higher cost | More accessible options |
| Data size | Moderate | Very large (imagery) |
| Deliverable options | Point cloud, classified | Point cloud, ortho, mesh, textured |

# Cost Comparison

Equipment Cost:
- LiDAR: $20,000-$100,000+ for payload
- Photogrammetry: $1,000-$15,000 for camera

Per-Project Cost:
- LiDAR: Higher equipment amortization
- Photogrammetry: Lower equipment, longer processing

# When to Choose Each

Choose LiDAR When:
- Site has vegetation you need to "see through"
- Bare-earth DEM is required
- Lighting conditions are challenging
- Fastest field time is priority
- Forestry or environmental applications
- Power line corridor mapping

Choose Photogrammetry When:
- Colorized deliverables are essential
- Orthomosaic is the primary deliverable
- Site is clear of vegetation
- Budget is constrained
- Textured 3D mesh is required
- Construction or mining applications

# Hybrid Approach

Best practice for many projects:
1. LiDAR for bare-earth and vegetation structure
2. Photogrammetry for color and orthomosaic
3. Merge deliverables for complete dataset

Equipment supporting both:
- Zenmuse L3: LiDAR + dual 100MP mechanical shutter cameras
- ROCK R3 Pro: LiDAR + 26MP camera

# Indoor vs Outdoor Applications

The LiDAR-vs-photogrammetry decision differs significantly for indoor and outdoor work:

Outdoor/Aerial (Drone-Based):
- LiDAR dominates for topographic surveys, corridor mapping, and vegetated sites
- Photogrammetry excels for construction progress monitoring and orthomosaic production
- Hybrid payloads (DJI Zenmuse L3) combine both for maximum flexibility

Indoor/Building (Terrestrial):
- Terrestrial laser scanning (Trimble X12, FARO Focus Premium) is the standard for [building documentation](/services/3d-laser-scanning-construction)
- Indoor photogrammetry has limited application due to lighting constraints
- Mobile SLAM scanners (NavVis VLX3) offer fast indoor coverage with moderate accuracy
- For [scan-to-BIM workflows](/blog/scan-to-bim-workflow/), terrestrial laser scanning is the clear choice

# Accuracy for AEC Applications

For architecture, engineering, and construction (AEC) projects, accuracy requirements drive the technology choice:

| Application | Required Accuracy | Recommended Technology |
|---|---|---|
| As-built documentation | ±2-6mm | [Terrestrial laser scanning](/services/3d-laser-scanning) |
| Construction verification | ±3-6mm | Terrestrial laser scanning |
| Site topographic survey | ±2-5cm | Drone LiDAR or photogrammetry |
| Volumetric earthwork | ±5-10cm | Drone photogrammetry (with GCPs) |
| Corridor/utility mapping | ±5-10cm | Drone LiDAR |
| Facade documentation | ±2-5mm | Terrestrial scanning + photogrammetry |

For more on [3D scanning accuracy](/blog/3d-scanning-accuracy) and how it affects project outcomes, see our accuracy guide.

# Cost Framework

Drone LiDAR services: $3,000-$15,000+ per project depending on site size and complexity.

Drone photogrammetry services: $1,500-$10,000+ per project. Lower equipment costs translate to lower service costs.

Terrestrial laser scanning: $0.20-$0.70 per square foot for building documentation. See our [cost calculator](/tools/cost-calculator) for project-specific estimates.

# Key Takeaway

LiDAR excels where vegetation penetration and lighting independence matter. Photogrammetry wins for colorized deliverables and budget-conscious projects. For building interiors and AEC documentation, terrestrial laser scanning is the established standard. Many professional projects benefit from combining multiple technologies for the most complete dataset.

For a detailed comparison of scanning methods for building projects, read our guide on [3D scanning vs traditional surveying](/blog/3d-scanning-vs-traditional-survey). To explore equipment options, see our [scanner comparison guide](/blog/3d-scanner-comparison-2026).