Convert Quad IJ to Icosa Triangle coordinates

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

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

Details

Equivalent to dggridR's dgQ2DI_to_PROJTRI().

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

if (FALSE) { # \dontrun{
# 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)
} # }