A cell's side in kilometres: a square's, or a hexagon's, which is also its centre-to-corner distance.
OptionalgridThe centre of one cell, which lays out the grid. Its latitude sets the cell size in degrees. Defaults to the centre of the points' bounding box.
Pass the same position each time, such as your city's centre, to keep the cells in place while your points change.
The options of a grid of hexagons or squares.