Scatter plots of biomass density at 250 m resolution from four national products versus CMS_RF product. From left to right are NBCD_NCE, Blackard, Wilson, and Saatchi, respectively. From top to down are NLCD2006 categorized total, forest, and non-forest, respectively. The y axis in each plot represents biomass values from national products, and the x axis represents the biomass values from CMS_RF product. Black dashed line is the fitted regression lines, gray solid line is the 1:1 line, and light blue to dark red represents sample kernal density. Forest and non-forest category are derived from aggregated NLCD2006 dataset at 250 m spatial resolution, with a threshold of 20 percentage for forest.