This map shows the land surface resized according to its annual gross primary production (GPP) in terms of their carbon currency (g C m-2). Each transformed grid cell in the map is proportional to the total annual production in that area which is also indicated through the colours that are overlaid. GPP is the net amount of energy that is produced by the main energy producers of an ecosystem.
Production is determined by first computing a daily net photosynthesis value which is then composited over an 8-day interval of observations for a year.
This map uses satellite-derived cumulative composite Gross Primary Production values from NASA’s Moderate Resolution Imaging Spectroradiometer (MOD17) at 1km resolution (accessed June 2018).