Convert Icosa Triangle to Quad XY coordinates

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

if (FALSE) { # \dontrun{
# 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$face,
  icosa_triangle_x = fwd$tx,
  icosa_triangle_y = fwd$ty
)
print(quad_xy)
} # }