Integration of remote-sensing and ground-based observations for estimation of emissions and removals of greenhouse gases in forests: methods and guidance from the Global Forest Observations Initiative - Penman, Jim; Green, Carly; Olofsson, Pontus; Raison, John; Woodcock, Curtis; Balzter, Heiko; Baltuck, Miriam; Foody, Giles M. (Food and Agriculture Organization, 2016)