Bioeconomy and Environment Natural Resources Institute Luke(Finland) Yliopistokatu 6 80100 Joensuu Finland;
Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences P.O.Box 5003 NO-1432Ås Norway.;
Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences P.O.Box 5003 NO-1432Ås Norway.;
Data fusion; Kalman filtering;