Cell area on this world, m².
H3 index.
People per km².
Ground height at the centre (local y), metres.
0…1 how good a place to live this is.
Land use.
0…1 night-light brightness.
People living here (an integer; the cells sum to the region's total).
Centre in local [x, z], metres.
Ground slope (rise/run).
0…1 access to fresh water or a coast.
One fine cell of the population grid.