MERRA-2 const_2d_asm_Nx: 2d, constants 0.625 x 0.5 degree V5.12.4 (M2C0NXASM) at GES DISC
M2C0NXASM (or const_2d_asm_Nx) is a data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2).  This collection consists of 2-dimensional constant model parameters, such as the fraction of lake, land, and ocean within a model grid cell. 

MERRA-2 is the latest version of …