a5R: 'A5' Discrete Global Grid System

Bindings for the "A5 geospatial index" <https://a5geo.org/>. 'A5' partitions the Earth's surface into pentagonal cells across 31 resolution levels using an equal-area projection onto a dodecahedron. Provides functions for indexing coordinates to cells, traversing the cell hierarchy, computing cell boundaries, and compacting/uncompacting cell sets. Powered by the 'A5' 'Rust' crate via 'extendr'.

Version:	0.3.1
Depends:	R (≥ 4.2)
Imports:	cli, rlang (≥ 1.1.0), units, vctrs (≥ 0.6.0), wk (≥ 0.9.0)
Suggests:	arrow, knitr, pillar, rmarkdown, sf, testthat (≥ 3.0.0), tibble, withr
Published:	2026-03-26
DOI:	10.32614/CRAN.package.a5R
Author:	Hugh Graham [aut, cre], belian.earth [cph]
Maintainer:	Hugh Graham <hugh at belian.earth>
BugReports:	https://github.com/belian-earth/a5R/issues
License:	Apache License (≥ 2)
URL:	https://github.com/belian-earth/a5R, https://belian-earth.github.io/a5R/
NeedsCompilation:	yes
SystemRequirements:	Cargo (Rust's package manager), rustc
Materials:	README, NEWS
CRAN checks:	a5R results

Documentation:

Reference manual:	a5R.html , a5R.pdf
Vignettes:	Getting started with a5R (source, R code) Working with Arrow and Parquet (source, R code) How a5R stores cell IDs without strings (source, R code) Multi-threading (source, R code) Traversal and distance (source, R code)

Downloads:

Package source:	a5R_0.3.1.tar.gz
Windows binaries:	r-devel: a5R_0.3.1.zip, r-release: a5R_0.3.1.zip, r-oldrel: a5R_0.3.1.zip
macOS binaries:	r-release (arm64): a5R_0.3.1.tgz, r-oldrel (arm64): a5R_0.2.0.tgz, r-release (x86_64): a5R_0.3.1.tgz, r-oldrel (x86_64): a5R_0.3.1.tgz
Old sources:	a5R archive

Linking:

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