1. Department of Geomatics, Forest Research Institute, 3 Braci Lesnej St., Sekocin Stary 05-090, Poland
2. Department of Forest Management Planning, Dendrometry and Forest Economics, Institute of Forest Sciences, Warsaw University of Life Sciences (SGGW), 159 Nowoursynowska St., Warsaw 02-776, Poland
3. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 Burnside Road West, Victoria, BC V8Z 1M5, Canada