Returns the hollow ring of H3 grids at exactly grid distance k from an origin cell.
Syntax
setof h3grid ST_GridRing(h3grid start, integer k);Parameters
| Parameter | Description |
|---|---|
origin | The origin H3 grid (center of the ring). |
k | The grid distance from the origin. |
Examples
Retrieve all H3 grids at grid distance 5 from the cell at latitude 25.1, longitude 123.1:
SELECT ST_GridRing(st_h3fromlatlng(25.1,123.1),5);Output:
st_griddisk
------------------------
01010060170363C5BAF408
01010066170363C5BAF408
01010062170363C5BAF408
01010063170363C5BAF408
01010061170363C5BAF408
....
(31 rows)