In order to implement more accurate 3D forest models, a feasible solution is the integration of point clouds obtained by aerial acquisition (ALS or photogrammetry) for the treetops and the terrain description, with information from terrestrial surveys. Further, point cloud resolution is not very high, as models with a grid of 2-3 m are usually obtained. However, airborne data acquisition is expensive and may provide poor results in case of dense foliage. To this purpose, aerial surveys, especially through Airborne Laser Scanning (ALS), were carried out in the last years to acquire point clouds to be used in 3D models aimed at achieving an accurate description of tree crowns and terrain. Their protection and management could greatly benefit from a complete knowledge of the shape and distribution of trees in forest stands. Forests are significant resources from an ecological, economic and social point of view.
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