Convert longitude/latitude to index string

Projects geographic coordinates to grid cells and returns their hierarchical index strings. Inputs are vectorized over lon and lat.

Usage

hexify_lonlat_to_index(
  lon,
  lat,
  resolution,
  aperture = 3L,
  index_type = c("auto", "z3", "z7", "zorder")
)

Arguments

lon

Longitudes in degrees

lat

Latitudes in degrees

resolution

Resolution level

aperture

Aperture (3, 4, or 7)

index_type

Index encoding: "auto" (default), "z3", "z7", or "zorder"

Value

A character vector of index strings, one per point. lon and lat must be the same length.

See also

Other hierarchical index: hexify_cell_to_index(), hexify_compare_indices(), hexify_default_index_type(), hexify_get_children(), hexify_get_parent(), hexify_get_resolution(), hexify_index_to_cell(), hexify_index_to_lonlat(), hexify_is_valid_index_type(), hexify_z7_canonical()

Examples

idx <- hexify_lonlat_to_index(16.37, 48.21, resolution = 5, aperture = 3)
idx7 <- hexify_lonlat_to_index(16.37, 48.21,
  resolution = 4, aperture = 7
)