Convert Cell ID to Quad IJ coordinates

Converts DGGRID-compatible cell IDs to Quad IJ coordinates. This is the inverse of hexify_quad_ij_to_cell().

Usage

hexify_cell_to_quad_ij(cell_id, resolution, aperture = 3L)

Arguments

cell_id

Numeric vector of cell IDs (1-based)

resolution

Grid resolution level (0-30)

aperture

Grid aperture: 3, 4, or 7

Value

Data frame with columns:

quad

Quad number (0-11)

i

Integer cell index along first axis

j

Integer cell index along second axis

Details

Compatible with dggridR's dgSEQNUM_to_Q2DI().

See also

hexify_quad_ij_to_cell for the forward operation, hexify_cell_to_icosa_tri for conversion to triangle coords

Other coordinate conversion: hexify_cell_id_to_quad_ij(), hexify_cell_to_icosa_tri(), hexify_cell_to_lonlat(), hexify_cell_to_plane(), hexify_cell_to_quad_xy(), hexify_grid_cell_to_lonlat(), hexify_grid_to_cell(), hexify_icosa_tri_to_plane(), hexify_icosa_tri_to_quad_ij(), hexify_icosa_tri_to_quad_xy(), hexify_lonlat_to_cell(), hexify_lonlat_to_plane(), hexify_lonlat_to_quad_ij(), hexify_quad_ij_to_cell(), hexify_quad_ij_to_icosa_tri(), hexify_quad_ij_to_xy(), hexify_quad_xy_to_cell(), hexify_quad_xy_to_icosa_tri(), hexify_roundtrip_test()

Examples

if (FALSE) { # \dontrun{
# Get Quad IJ coordinates for a cell
result <- hexify_cell_to_quad_ij(cell_id = 1000, resolution = 10, aperture = 3)
print(result)

# Round-trip test
cell_id <- hexify_quad_ij_to_cell(result$quad, result$i, result$j,
                                   resolution = 10, aperture = 3)
# Should equal original cell_id
} # }