[4.0.0-rc3] - 2022-06-03

Fixed

• Fix polyfill bug when vertex latitude exactly matches cell center. (#603)

Changed

• The file CMakeTests.cmake is no longer included if ENABLE_TESTING is off. (#609)

[4.0.0-rc2] - 2022-03-16

Breaking changes

• experimentalH3ToLocalIj and experimentalLocalIjToH3 renamed to cellToLocalIj and localIjToCell respectively. (#586)
• cellToLocalIj and localIjToCell accept a mode argument for future expansion. (#586)
• cellToCenterChild (previously h3ToCenterChild) returns an error code. (#581)

Added

• E_OPTION_INVALID error code added. (#586)

[4.0.0-rc1] - 2022-02-07

Breaking changes

• Rename functions according to the terminology RFC (#571, #403, #466, #495, #466)
• Functions that can experience errors now have an H3Error return value. (#551, #550, #509, #505, #507, #508, #503, #478, #468, #436, #359)
• Cell count parameters use int64_t instead of int.
• polygonToCells (previously polyfill) accepts a flags argument for future expansion. (#570)

Added

• Vertex mode and associated functions: (#422, #420, #417)
  • cellToVertex(cell, vertexNum)
  • cellToVertexes(cell, out)
  • vertexToLatLng(vertex, out)
  • isValidVertex(vertex)
• h3 CLI application. (#556, #497)

Fixed

• A number of issues detected via unit tests and fuzzers were fixed. (#568, #562, #558, #559, #560, #430)

Other changes

• Generally use lng instead of lon
• Closed-form implementation of numHexagons
• A number of fuzzer harnesses are now included in the H3 core library. (#557, #553, #545, #433)
• Additional benchmarks are added and benchmarks are regularly run in CI. (#524, #518)

[3.7.2] - 2021-07-15

Fixed

• kRing of invalid indexes should not crash. (#498)

[3.7.1] - 2020-10-05

Fixed

• Finding invalid edge boundaries should not crash. (#399)
• Build fixes for FreeBSD. (#397)

[3.7.0] - 2020-09-28

Added

• Area and haversine distance functions (#377):
  • cellAreaRads2
  • cellAreaKm2
  • cellAreaM2
  • pointDistRads
  • pointDistKm
  • pointDistM
  • exactEdgeLengthRads
  • exactEdgeLengthKm
  • exactEdgeLengthM
• Refactor getH3UnidirectionalEdgeBoundary for accuracy at small resolutions. (#391)
  • Speeds up getH3UnidirectionalEdgeBoundary by about 3x.
  • Implement core logic for future vertex mode.

Fixed

• Fixed building the library with custom memory allocation functions on Mac OSX. (#362)
• The installed H3 CMake target should have include directories specified. (#381)

Changed

• Tests now use bash on Windows. (#381)

[3.6.4] - 2020-06-19

Added

• H3_MEMORY_PREFIX CMake option for replacing the memory management functions used in H3. (#317)
• Support for building Debian packages of H3. (#352)

Fixed

• Removed duplicate include statements. (#333)
• Fixed macro H3_DIGIT_MASK_NEGATIVE. (#329)

Changed

• Again implement new polyfill algorithm. (#313)

[3.6.3] - 2020-01-21

Fixed

• compact detects and fails on cases with duplicated input indexes. (#299)

Changed

• h3IsValid returns false for indexes that have non-zero reserved bits. (#300)
• h3IsValid and h3UnidirectionalEdgeIsValid return false for indexes with the high bit set. (#300)

[3.6.2] - 2019-12-9

• Revert new polyfill algorithm until reported issues are fixed. (#293)

[3.6.1] - 2019-11-11

Fixed

• compact handles zero length input correctly. (#278)
• bboxHexRadius scaling factor adjusted to guarantee containment for polyfill. (#279)
• polyfill new algorithm for up to 3x perf boost. (#282)
• Fix CMake targets for KML generation. (#285)