Can Drones Estimate Timber Volume for Forestry Inventory Purposes?

Yes, LiDAR-based canopy and terrain modeling can estimate timber volume across a forest stand, offering a faster, broader-coverage complement to traditional ground-based timber cruising. Because LiDAR can penetrate gaps in the canopy to capture both the canopy surface and the ground beneath it, a single survey builds the structural dataset that volume estimation models are built on.

How Drone Timber Volume Estimation Works

A LiDAR-equipped drone flies the stand, capturing a dense point cloud that includes both the canopy surface and, through gaps in the canopy, the underlying terrain. That combined dataset produces a canopy height model, the difference between the canopy surface and the ground, along with canopy density information across the stand. Volume estimation models then use that structural data, calibrated against species-specific relationships between canopy structure and stem volume, to produce a timber volume estimate for the surveyed area.

Why It Matters

Timber volume has direct financial value for forestry operators and licensees, similar to how stockpile volume matters in mining, accurate inventory numbers affect valuation, harvest planning, and contract negotiations. A LiDAR-based survey covers an entire stand systematically and produces a spatially detailed dataset, rather than relying solely on a sample of ground plots extrapolated across a much larger area, which is how traditional timber cruising typically works.

Limitations

A LiDAR-based volume estimate is a statistical model built from canopy structure data, it's not a direct physical count of every tree, and its accuracy depends on how well the underlying volume model is calibrated to the specific species and stand conditions being surveyed. Traditional ground-based cruising, with actual tree measurements, remains an important calibration and validation reference for that model rather than something the aerial survey fully replaces. Canopy density also affects how much of the ground the LiDAR can actually see, very dense, multi-layered canopy reduces ground penetration and can affect terrain model accuracy in those specific areas.