Global aboveground biomass carbon density of grass in the year 2010 – uncertainty

This layer represents the uncertainty of the aboveground biomass (AGB) carbon (C) density estimates for grass that were used to create the harmonized global AGB C density map of Spawn et al. (2020). It has been scaled by 10 to reduce file size and should by multiplied by 0.1 before analysis to attain units of megagrams C per hectare (MgC/ha). Since grass may coexist with other vegetation types within the extent of a given grid cell, estimates in this layer have been proportionally adjusted to account for the relative spatial extent that grass is assumed to occupy in each grid cell. Grid cells that do not contain grass report a value of zero. As such, taking the root sum of the squared accompanying layers for tree, grass, tundra and crop AGB C will produce the uncertainty layer of the harmonized global AGB C density map of Spawn et al. (2020).