1. Department of Forest Sciences, University of Helsinki, Helsinki, Finland
2. Centre of Excellence in Laser Scanning Research, Finnish Geospatial Research Institute FGI, Masala, Finland
3. Arbonaut Ltd., Joensuu, Finland
4. Department of Forestry Engineering, TreeSatLab, University of Cordoba, Cordoba, Spain
5. Department of Built Environment, Aalto University, Espoo, Finland