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Change Log

All notable changes to A5 will be documented in this file.

For the latest documentation, visit A5 Documentation

A5

A5 [v0.8.0] - May 12 2026

fix(cell): Spiral unstable in polar regions (#98)
feat(regions): Implement polygonToCells (#97)
feat(traversal): lineStringToCells (#96)
Refactor: lattice boundary helpers (#95)
feat(serialization): Improve cellToParent speed (#94)

A5 [v0.7.3] - Apr 9 2026

fix: normalize longitude in toLonLat to -180-180 (#90)

A5 [v0.7.2] - Mar 29 2026

Feature: Support neighbor functions in res 0 & 1 (#87)

A5 [v0.7.1] - Mar 11 2026

Feature: Support (de)serialization of resolution 30 cells (#82)

A5 [v0.7.0] - Mar 3 2026

Feature: gridDisk & sphericalCap (#78)

A5 [v0.6.1] - Nov 11 2025

feat: World cell handling (#66)

A5 [v0.6.0] - Oct 30 2025

Feature: cell compaction/uncompaction (#64)

A5 [v0.5.0] - Sep 21 2025

BREAKING: Renamed hex conversion functions to use u64 naming convention
- hexToBigInt → hexToU64
- bigIntToHex → u64ToHex

A5 v0.4

A5 [v0.4.2] - Aug 7 2025

Fixed: cellToChildren and cellToParent functions (#52)
Added: JavaScript and Python quickstarts to website (#51)

A5 [v0.4.1] - Jul 30 2025

Fixed: Containment check in lattice app (#50)
Added: Tiling tests (#49)
Changed: Tidy geometry pentagon (#48)
Fixed: a5cellContainsPoint check in projected space (#47)
Changed: Improve accuracy of origin.quat definitions (#46)

A5 [v0.4.0] - Jul 15 2025

Changed: Tidy geometry classes and tests (#45)
Changed: calculate_error_budgets: stochastic sampling (#44)
Added: getRes0Cells, cellArea & getNumCells functions (#43)

A5 v0.3

A5 [v0.3.0] - Jul 13 2025

Changed: Refactor of projection tests & test data (#42)
Changed: Update heatmap data (#41)
Added: Static CRS to improve projection accuracy (#40)
Added: Integration fixtures (#39)
Changed: Area calculation cleanup (#38)
Added: True equal area polyhedral projection (#37)
Changed: Website tweaks (#34)
Added: Missing tests & general integration test (#33)
Changed: Update heatmap data with authalic projection (#32)

A5 v0.2

A5 [v0.2.0] - Jun 10 2025

Added: Use authalic latitude (#31)
Changed: Low/high warp parameters (#30)
Added: Curved edge segments & GeoJSON output format (#29)
Changed: Tweak warp parameters (#28)
Changed: Update traffic data (#27)
Added: SphericalPentagonShape & test app (#26)
Changed: Better point in pentagon test (#25)
Added: Test fixed places (#24)
Changed: Update cell.test.ts (#23)
Changed: Update curve such that child cells overlap parent (#22)
Added: Authalic conversion functions (#21)
Added: Dependency analysis (#20)
Changed: Rename coordinate systems files (#19)
Changed: Update warp tests (#18)
Added: CI workflow to check that website will build (#17)
Added: Setup PR template and CI testing (#16)
Changed: Cleanup imports to avoid circular dependencies

A5 v0.1

A5 [v0.1.3] - May 16 2025

Fixed: Remove browser from package.json

A5 [v0.1.2] - May 16 2025

Fixed: Package compatibility issues

A5 [v0.1.1] - May 16 2025

Fixed: Better package compatibility

A5 [v0.1.0] - May 16 2025

Added: Initial release of A5 - Global Pentagonal Geospatial Index
Added: Core indexing functions (lonLatToCell, cellToLonLat, cellToBoundary)
Added: Hierarchy functions (cellToParent, cellToChildren, getResolution)
Added: Hex conversion utilities
Added: Complete projection system with authalic, gnomonic, and polyhedral projections
Added: Geometry utilities for pentagon and spherical polygon operations
Added: Comprehensive test suite
Added: TypeScript support with full type definitions
Added: Multiple output formats (ESM, CJS, UMD)