hexify_quad_ij_to_icosa_tri: Convert Quad IJ to Icosa Triangle coordinates

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

Convert Quad IJ to Icosa Triangle coordinates

Description

Converts Quad IJ coordinates to icosahedral triangle coordinates. This is useful for understanding where a cell is located on the icosahedral projection.

Usage

hexify_quad_ij_to_icosa_tri(quad, i, j, resolution, aperture = 3L)

Arguments

quad	Quad number (0-11), integer or vector
i	Cell index along first axis, integer or vector
j	Cell index along second axis, integer or vector
resolution	Grid resolution level (0-30)
aperture	Grid aperture: 3, 4, or 7

Details

Equivalent to 'dggridR' dgQ2DI_to_PROJTRI().

Value

Data frame with columns:

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

hexify_icosa_tri_to_quad_ij for the inverse, hexify_cell_to_icosa_tri for conversion from cell ID

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_xy(), hexify_quad_xy_to_cell(), hexify_quad_xy_to_icosa_tri(), hexify_roundtrip_test()

Examples

# Get triangle coordinates for a Quad IJ position
result <- hexify_quad_ij_to_icosa_tri(quad = 1, i = 100, j = 50,
                                       resolution = 10, aperture = 3)
print(result)

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