Cells within k hops of a cell

Returns all cells reachable within k edge hops of a centre cell, including the centre cell itself.

Usage

a5_grid_disk(cell, k, vertex = FALSE)

Arguments

cell

A single a5_cell value.

k

Integer scalar, number of hops.

vertex

Logical scalar. If FALSE (default), only edge-sharing neighbours (4-connected) are traversed. If TRUE, vertex-sharing neighbours are included (8-connected).

Value

A compacted a5_cell vector.

See also

a5_spherical_cap() for distance-based selection.

Examples

cell <- a5_lonlat_to_cell(-3.19, 55.95, resolution = 8)
a5_grid_disk(cell, k = 1)
#> <a5_cell[6]>
#> [1] 633df80000000000 6341380000000000 6341480000000000 6344980000000000
#> [5] 6344a80000000000 6344b80000000000