Indexing the aperture 3 hexagonal discrete global grid
Over the past decade there has been interest in the computer representation of global data based on multi-resolution subdivisions of regular polyhedra. A simple and efficient indexing of the cells of such a subdivision, called A3-coordinates, is introduced. These can be used to encode the 43n+2 cells at the nth level of resolution of the octahedral aperture 3 hexagonal discrete global grid using n+3 digits, each digit from the set {?1,0,1}.
discrete global grid spherical tessellation hexagonal tessellation