hexify_icosa_tri_to_quad_xy: Convert Icosa Triangle to Quad XY coordinates

In hexify: Equal-Area Hex Grids on the 'Snyder' 'ISEA' 'Icosahedron'

Convert Icosa Triangle to Quad XY coordinates

Description

Converts icosahedral triangle coordinates (from Snyder projection) to quad XY coordinates. This is an intermediate step in the pipeline.

Usage

hexify_icosa_tri_to_quad_xy(
  icosa_triangle_face,
  icosa_triangle_x,
  icosa_triangle_y
)

Arguments

icosa_triangle_face	Triangle face number (0-19)
icosa_triangle_x	X coordinate on triangle face
icosa_triangle_y	Y coordinate on triangle face

Value

List with components:

quad	Quad number (0-11)
quad_x	Continuous X coordinate in quad space
quad_y	Continuous Y coordinate in quad space

See Also

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_ij(), 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_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

# First get triangle coordinates from lon/lat
fwd <- hexify_forward(lon = 2.35, lat = 48.86)

# Then convert to quad XY
quad_xy <- hexify_icosa_tri_to_quad_xy(
  icosa_triangle_face = fwd["face"],
  icosa_triangle_x = fwd["icosa_triangle_x"],
  icosa_triangle_y = fwd["icosa_triangle_y"]
)
print(quad_xy)

hexify documentation built on March 1, 2026, 1:07 a.m.