NEWS.md

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

hexify 0.6.5

• Fixed empty translation unit warning in vendored H3 h3Assert.c (clang 21 -Wempty-translation-unit)

hexify 0.6.4

• Removed compiled object files (.o) from source tarball that caused installation failure on Linux (Debian) and NOTE on all platforms
• Wrapped plot_globe() examples in \donttest{} to reduce check time (was 608s on win-builder)
• Reworded DESCRIPTION to avoid "vendored" spelling flag

hexify 0.6.3

• cell_to_sf() now applies sf::st_wrap_dateline() automatically, fixing horizontal streaks on flat map projections (Plate Carrée, Robinson, etc.) for hexagons crossing the ±180° antimeridian
• as_sf(x, geometry = "polygon") now routes all grids (ISEA and H3) through cell_to_sf(), ensuring consistent antimeridian handling
• hexify_cell_to_sf() gains antimeridian normalization matching cell_to_sf()
• Vignettes no longer require manual st_wrap_dateline() calls

hexify 0.6.2

Native H3 backend — zero external dependencies

• Vendored H3 v4.4.1 C source, replacing the h3o R package dependency
• H3 is now always available — no optional install, no Suggests
• Uses H3 experimental polygon fill for full spatial coverage in hexify()
• New native C++ bindings: h3_lat_lng_to_cell, h3_cell_to_boundary, h3_cell_to_parent, h3_cell_to_children, h3_polygon_to_cells, h3_cell_area_km2, h3_cell_to_lat_lng

hexify 0.6.1

• Warn when aperture is passed with type = "h3" (ignored parameter)
• Expanded H3 resolution guidance in hex_grid() documentation
• Extended H3 vignette resolution table to full range (0-15)
• Added h3_crosswalk() example to H3 vignette

hexify 0.6.0

ISEA–H3 crosswalk and per-cell area

• New h3_crosswalk(): bidirectional mapping between ISEA and H3 cell IDs, with automatic resolution matching and per-cell area comparison
• New cell_area(): returns geodesic area (km²) for each cell — constant for ISEA (equal-area), location-dependent for H3, with session-scoped caching
• HexData $cell_area_km2, [["cell_area_km2"]], and as.data.frame() now return per-cell areas for H3 grids instead of the grid-wide average
• Internal: extracted closest_h3_resolution() helper shared by hex_grid() and h3_crosswalk()

hexify 0.5.0

H3 grid support

• Added H3 (Uber) as a first-class grid type: hex_grid(resolution = 8, type = "h3")
• All core functions work with H3 grids: hexify(), cell_to_sf(), grid_rect(), grid_global(), grid_clip(), get_parent(), get_children()
• H3 support requires the h3o package (Suggests, not required for ISEA workflows)
• New hexify_compare_resolutions(type = "h3") for H3 resolution table
• dgearthstat() now accepts HexGridInfo objects directly
• New grid_type slot on HexGridInfo: "isea" (default) or "h3"
• HexData cell_id slot supports character (H3) and numeric (ISEA) cell IDs
• Backward compatible: all existing ISEA workflows unchanged

hexify 0.3.10

Hotfix for geometry issues

• Fixed invalid pentagon geometries that caused gaps in global grids
• Fixed antimeridian-crossing polygons using st_wrap_dateline()
• Added polar cap sampling to grid_global() to include cells above ±85° latitude

hexify 0.3.6

• Reduced test suite runtime for CRAN by skipping detailed consistency tests (full tests still run locally via NOT_CRAN=true)
• Fixed CRAN incoming check NOTE: "Overall checktime 15 min > 10 min"

hexify 0.3.5

• Simplified plot examples to reduce runtime
• Added non-standard files to .Rbuildignore
• Fixed slow example NOTE

hexify 0.3.4

Hotfix for CRAN UBSAN check failure

• Fixed undefined behavior in Snyder ISEA projection causing NaN values (UBSAN error on M1 Mac CRAN check: "nan is outside the range of representable values of type 'long long'" at coordinate_transforms.cpp:243-244)
• Root cause: floating-point precision in face assignment could project points onto geometrically invalid triangle faces near icosahedron edges
• Solution: added projection validation with face-retry logic - if validation fails (z > DH), automatically tries adjacent faces until valid

hexify 0.3.3

• CRAN submission fixes

hexify 0.3.2

• Documentation improvements
• Fixed hierarchical index functions
• Increased test coverage to 90%

hexify 0.3.1

• Minor bug fixes

hexify 0.3.0

• Major refactoring of coordinate transformation system
• Improved performance for large grids

hexify 0.2.0

• Added dggridR compatibility functions (as_dggrid(), from_dggrid())
• New hierarchical indexing support with H-index functions
• Improved coordinate conversion pipeline
• Added grid statistics functions

hexify 0.1.0

• Initial release
• ISEA discrete global grid implementation
• Support for apertures 3, 4, 7, and mixed 4/3
• Compatible with dggridR output

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