The map is partitioned into hexagons. This is done at multiple resolutions, where with each increasing resolution, a hex cell occupies approximately 1/7th less surface area.
A k-ring is any concentric ring around a cell. The 1-ring is the ring of cells you can get to with one outward hop / traversal. The 2-ring is the same, but for 2 hops. And so on.
For each location ingested, we use the H3 library to determine hex cells at various resolutions, as well as the 1-ring and 2-ring at various resolutions.
Lots of resolutions are supported:
| Resolution | Avg Hex Area | Avg Hex Edge Length (km) | Number of unique indexes |
|---|---|---|---|
| 5 | 252.9 km2 | 8.5 km | 2,016,842 |
| 6 | 36.13 km2 | 3.2 km | 14,117,882 |
| 7 | 5.16 km2 | 1.2 km | 98,825,162 |
| 8 | 737327.6 m2 | 461 m | 691,776,122 |
| 9 | 105332.5 m2 | 174 m | 4,842,432,842 |
| 10 | 15047.5 m2 | 65 m | 33,897,029,882 |
| 11 | 2149.6 m2 | 24 m | 237,279,209,162 |
Brooklyn is 250 km2 (one cell at Resolution 5)...
Williamsburg is 5 km2 (one cell at Resolution 7)...
