index_to_cell_internal

Internal function to decode a cell index string into its constituent
components: face number, grid coordinates (i, j), and resolution level.

internal

Provides functions to build and use equal-area hexagonal discrete
global grids using the 'Snyder' 'ISEA' projection ('Snyder' 1992
<doi:10.3138/27H7-8K88-4882-1752>). Implements the 'ISEA' discrete global grid
system ('Sahr', 'White' and 'Kimerling' 2003 <doi:10.1559/152304003100011090>).
Includes a fast 'C++' core for projection and aperture quantization, and
'sf'/'terra'-compatible R wrappers for grid generation and coordinate assignment.
Output is compatible with 'dggridR' for interoperability.

Gilles Colling

hexify

Equal-Area Hex Grids on the 'Snyder' 'ISEA' 'Icosahedron'

index_to_cell_internal function

<dl><dt>index</dt>
<dd>Cell index string</dd>
<dt>aperture</dt>
<dd>Grid aperture (3, 4, or 7)</dd>
<dt>index_type</dt>
<dd>Index encoding type ("z3", "z7", or "zorder")</dd></dl>

Arguments

Decode a cell index to face, i, j, and resolution — index_to_cell_internal

<dl>

<dt>index</dt>
<dd>Cell index string</dd>


<dt>aperture</dt>
<dd>Grid aperture (3, 4, or 7)</dd>


<dt>index_type</dt>
<dd>Index encoding type ("z3", "z7", or "zorder")</dd>

</dl>

index_to_cell_internal: Decode a cell index to face, i, j, and resolution

Description

Usage

Value

Arguments