hexify_quad_xy_to_icosa_tri: Convert Quad XY to Icosa Triangle coordinates

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

Convert Quad XY to Icosa Triangle coordinates

Description

Inverse transformation from quad coordinates back to icosahedral triangle coordinates. Useful for projecting cell centers back to lon/lat.

Usage

hexify_quad_xy_to_icosa_tri(quad, quad_x, quad_y)

Arguments

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

Value

List with components:

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

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_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_roundtrip_test()

Examples

# Convert quad XY back to triangle coordinates
tri <- hexify_quad_xy_to_icosa_tri(quad = 1, quad_x = 0.5, quad_y = 0.3)
print(tri)

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