hexify_lonlat_to_h_index: Convert longitude/latitude to hexagonal cell hierarchical...

In hexify: Equal-Area Hex Grids on the 'Snyder' 'ISEA' 'Icosahedron'

Convert longitude/latitude to hexagonal cell hierarchical index

Description

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.

Usage

hexify_lonlat_to_h_index(grid, lon, lat)

Arguments

grid	Grid specification from hexify_grid()
lon	Longitude vector in degrees (numeric, -180 to 180)
lat	Latitude vector in degrees (numeric, -90 to 90)

Details

Most users should use hexify_lonlat_to_cell or hexify_grid_to_cell which return DGGRID-compatible integer cell IDs.

This function returns hierarchical index strings useful for:

• Understanding the cell's position in the hierarchy

• Prefix-based spatial queries

• Parent/child cell relationships

Value

Data frame with columns:

h_index	Hierarchical index (character string)
face	Icosahedron face number (integer, 0-19)

hexify documentation built on March 1, 2026, 1:07 a.m.