1. Department of Forest Sciences, University of Helsinki, Helsinki, Finland.
2. Canadian Forest Service (Pacific Forestry Centre), Natural Resources Canada, Victoria, British Columbia, Canada.
3. FAO Forestry Department, Rome, Italy.
4. Finnish Forest Research Institute (Metsäntutkimuslaitos), Vantaa, Finland.
5. Swiss Federal Research Institute (WSL), Birmensdorf, Switzerland.
6. Department of Remote Sensing and Photogrammetry, Finnish Geodetic Institute, Masala, Finland.
7. School of Science and Technology, Aalto University, Espoo, Finland; and Helsinki Metropolia University of Applied Sciences, Helsinki, Finland.