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All notable changes to this project will be documented in this file. This project adheres to a versioning policy.

The public API of this library consists of the public functions declared in file H3Core.java, and support for the Linux x64 and Darwin x64 platforms.

Unreleased Changes

[4.4.0] - 2025-12-12

Added

  • constructCell, isValidIndex, and getIndexDigit functions.

Changed

  • Restored benchmark target to the build script. (#188)
  • Upgraded the core library to v4.4.1. (#192)

[4.3.2] - 2025-10-10

Changed

  • Added option to build and publish as an Android module into h3-android. (#184)

Fixed

  • Removed duplicate native code resources from the built artifacts. (#186)

[4.3.1] - 2025-08-27

Changed

  • Upgraded build process for Android 16kb support. (#181)

Fixed

  • Fixed the build process crashing at the end of the release. (#181)

[4.3.0] - 2025-08-21

Added

  • polygonToCellsExperimental functions from H3 v4.2.0. (#163)
  • gridRing function from H3 v4.3.0. (#169)

Fixed

  • Corrected order of polygonToCellsExperimental arguments. (#166)
  • Fixed build on ARM Linux. (#162)

Changed

  • Converted build system to Gradle and automated deploys. Added separate build steps for mac OS on M1 (ARM) and x64. (#167, #168)
  • Upgraded the core library to v4.2.1. (#165)

[4.1.2] - 2024-11-01

Note: This release is not available in Maven Central.

Fixed

  • Fixed a memory leak in polygonToCells and optimize JNI calls. (#150)
  • Use Files.createTempFile so temporary file permissions are more restrictive. (#141)
  • Fixed a potential segfault in cellsToMultiPolygon on error. (#129)

Changed

  • Optimize JNI calls. (#154)
  • Added JNI config and tests for native image. (#153, #155)
  • Bumped dockcross versions (#151, #152)
  • Upgrade Guava test dependency. (#146)
  • Test Java 22. (#144)

[4.1.1] - 2023-02-03

The changelog for this release is the same as v4.1.0. The release was run again due to an issue with the release process.

[4.1.0] - 2023-01-19

Added

  • cellToChildPos and childPosToCell functions. (#121)
  • Made the cellToChildrenSize function public. (#121)

Changed

  • Upgraded the core library to v4.1.0. (#121)
  • Release artifacts are now built in Github Actions. (#124)

[4.0.2] - 2022-09-21

Changed

  • Upgraded the core library to v4.0.1. (#113)

[4.0.1] - 2022-09-14

Fixed

  • Fixed the path to Windows resources. (#109)

[4.0.0] - 2022-08-23

Breaking Changes

  • Upgraded the core library to v4.0.0. (#104, #103, #102, #91)

Added

  • H3CoreV3 for users who wish to temporarily use old function names. (#91)
  • Vertex mode API. (#91)

Changed

  • Required version of glibc on Linux is 2.26. (#98)

Removed

  • Removed support for Linux MIPS and MIPSEL (#98, #92)

[4.0.0-rc4] - 2022-08-17

Breaking Changes

  • Upgraded the core library to v4.0.0-rc5. (#104)
  • exactEdgeLength function renamed to edgeLength. (#104)

[4.0.0-rc3] - 2022-07-26

Breaking Changes

  • Upgraded the core library to v4.0.0-rc4. (#102)
  • distance function renamed to greatCircleDistance. (#102)

[4.0.0-rc2] - 2022-06-09

Changed

  • Required version of glibc on Linux is 2.26. (#98)

Removed

  • Removed support for Linux MIPS (#98)

[4.0.0-rc1] - 2022-03-29

Breaking Changes

  • Changed the API of H3Core to align it with the core library. (#91)

Added

  • H3CoreV3 for users who wish to temporarily use old function names. (#91)
  • Vertex mode API. (#91)

Changed

  • Upgraded the core library to v4.0.0-rc2. (#91)

Removed

  • Removed support for Linux MIPSEL (#92)

[3.7.2] - 2022-02-07

Added

  • Added Apple M1 build (#89)

Fixed

  • Fixes local build script to support Apple M1 (#86)

[3.7.1] - 2021-08-18

Fixed

  • Fixes for non-English locales (#80)

Changed

  • Updated the core library to v3.7.2. (#81)

[3.7.0] - 2020-12-03

Added

  • Area and haversine distance functions (#70)
    • cellArea
    • pointDist
    • exactEdgeLength

Changed

  • Updated the core library to v3.7.1. (#70)

[3.6.4] - 2020-06-29

Changed

  • Updated the core library to v3.6.4. (#64)
  • Updated the core library to v3.6.3. (#61)

[3.6.3] - 2020-01-10

Changed

  • Avoid reloading the native library once loaded (#58)

[3.6.2] - 2019-12-16

Changed

  • Updated the core library to v3.6.2, fixing some regressions in polyfill. (#56)

[3.6.1] - 2019-11-21

Changed

  • Updated the core library to v3.6.1. (#53)

[3.6.0] - 2019-08-19

Added

  • getPentagonIndexes and h3ToCenterChild functions. (#49)

Changed

  • Updated the core library to v3.6.0. (#49)
  • Native implementations of getRes0Indexes and getPentagonIndexes changed to throw OutOfMemoryError if the output array size is too small. (#49)

[3.5.0] - 2019-07-22

Changed

  • Updated the core library to v3.5.0. (#47)

[3.4.1] - 2019-05-03

Changed

  • Updated the core library to v3.4.3. (#44)

[3.4.0] - 2019-02-22

Added

  • getRes0Indexes function. (#38)

Changed

  • Updated the core library to v3.4.2. (#38)

[3.3.0] - 2019-02-13

Added

  • h3Line function. (#36)

Changed

  • Updated the core library to v3.3.0. (#36)

[3.2.0] - 2018-10-16

Added

  • Support for building on Windows. (#26)
  • experimentalH3ToLocalIj and experimentalLocalIjToH3 functions. (#32)

Changed

  • Updated the core library to v3.2.0. (#32)

Fixed

  • Don't require a C++ compiler. (#30)

[3.1.0] - 2018-10-04

Added

  • h3Distance function. (#21)
  • newInstance override that accepts specific operating system and architecture values. (#24)

Changed

  • Updated the core library to v3.1.0. (#21)
  • Updated the core library to v3.1.1. (#28)

[3.0.4] - 2018-07-25

Changed

  • Updated the core library to v3.0.8, fixing a possible segfault. (#19)

[3.0.3] - 2018-05-22

Breaking Changes

  • Replaced Vector2D with GeoCoord.
  • Removed the geoJsonOrder parameter from polyfill functions.

[3.0.2] - 2018-05-08

Fixed

  • Fixed memory management in polyfill with multiple holes.
  • Fixed build on Linux without Docker.

Changed

  • Improve detection of x86 architecture.

[3.0.1] - 2018-04-30

Added

  • Added release settings.
  • Added script for cross compiling using dockcross.

Changed

  • Updated the core library to v3.0.5.
  • Changed the native library loader to detect more operating systems.

[3.0.0] - 2018-03-27

Added

  • First public release.