Global C4 distribution estimate constrained by observations and optimality theory

This dataset includes annual C4 distribution and its uncertainty from 2001 to 2019. We also provide the distribution of C4 natural grasses and C4 crops during the same period. Please refer to manuscript for more details: Luo, X., Zhou, H., Satriawan, T.W., Tian, J., Zhao, R., Keenan, T.F., Griffith, D. M., Sitch, S. Smith, N.G. & Still, C.J. Global C4 distribution estimate constrained by observations and optimality theory. In revision. Update (August 2023): we have corrected the issue caused by a bias in the remote sensing grassland based map, and released the version 2 of the C4 map (C4_distribution_NUS_v2.nc) Update (June 2023): we noticed there is an important error in the version 1 of our C4 map, due to the quality of remote sensing grassland map used. We are now working on providing a new version (V2) in the next few months (Jun 2023).