hexify_lonlat_to_h_index

Converts geographic coordinates (longitude, latitude) to hexagonal cell
hierarchical index strings. These strings encode the face, resolution, and
cell location in a Z-order (Morton code) format.

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'

hexify_lonlat_to_h_index function

<dl><dt>grid</dt>
<dd>Grid specification from hexify_grid()</dd>
<dt>lon</dt>
<dd>Longitude vector in degrees (numeric, -180 to 180)</dd>
<dt>lat</dt>
<dd>Latitude vector in degrees (numeric, -90 to 90)</dd></dl>

Arguments

Convert longitude/latitude to hexagonal cell hierarchical index — hexify_lonlat_to_h_index

<dl>

<dt>grid</dt>
<dd>Grid specification from hexify_grid()</dd>


<dt>lon</dt>
<dd>Longitude vector in degrees (numeric, -180 to 180)</dd>


<dt>lat</dt>
<dd>Latitude vector in degrees (numeric, -90 to 90)</dd>

</dl>

hexify_lonlat_to_h_index: Convert longitude/latitude to hexagonal cell hierarchical index

Description

Usage

Value

Arguments

Details