3D aerial scans document natural regrowth of native forests in Cairngorms
A University of Cambridge team used airborne laser scanning to map tree regeneration across 569 square kilometers of Scotland's Cairngorms National Park. They identified over six million individual trees, with more than 40% being young saplings under five meters tall, indicating natural forest recovery. The study also found that drier heathlands support more new trees than boggy areas.
The aerial surveys relied on LiDAR technology deployed from a light aircraft flying roughly 600 meters above ground, generating three-dimensional landscape images far richer than ground-based surveys could produce. An AI-assisted analytical approach then distinguished individual trees and calculated each one's height across the 569-square-kilometer study zone.
The findings highlight deer management as a pivotal factor in natural regeneration. Young saplings clustered near established forest edges where seeds land most readily, yet some appeared more than half a kilometer away. Habitat conditions also shaped recovery patterns, with drier heathlands showing stronger regrowth than waterlogged bogs. The method may prove valuable for tracking fire impacts as climate change intensifies.
This mapping technique could transform how restoration projects are evaluated, giving landowners and conservation groups a cost-effective way to verify woodland recovery across vast territories. Policymakers may use such data to refine deer management strategies and habitat restoration targets. Communities dependent on tourism or forestry could benefit from healthier ecosystems, while researchers gain a replicable monitoring tool applicable to other rewilding initiatives facing similar ecological challenges.