Fine H3 cell it is centred in.
Size class.
Index in PopulationData.settlements (0 = the largest).
Tier: 0 urban centre, 1 town, 2 village, 3 hamlet (with levels = 4); farmsteads are levels.
People (an integer). Ranked settlements' people are spread over the cells around them.
Centre in local [x, z], metres (seeded jitter inside the cell, always on dry land).
Radius of the built-up core, metres.
Rank-size rank (1 = largest); 0 for farmsteads.
A place people live. Settlements are central places in a hierarchy (Christaller), sized by rank (Zipf).