hexify_roundtrip_test

Tests the accuracy of the coordinate conversion functions by converting
coordinates to cells and back, measuring the distance between original
and reconstructed coordinates.

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_roundtrip_test function

<dl><dt>grid</dt>
<dd>Grid specification</dd>
<dt>lon</dt>
<dd>Longitude to test</dd>
<dt>lat</dt>
<dd>Latitude to test</dd>
<dt>units</dt>
<dd>Distance units ("km" or "degrees")</dd></dl>

Arguments

Round-trip accuracy test — hexify_roundtrip_test

<dl>

<dt>grid</dt>
<dd>Grid specification</dd>


<dt>lon</dt>
<dd>Longitude to test</dd>


<dt>lat</dt>
<dd>Latitude to test</dd>


<dt>units</dt>
<dd>Distance units ("km" or "degrees")</dd>

</dl>

hexify_roundtrip_test: Round-trip accuracy test

Description

Usage

Value

Arguments

See Also