uber/h3

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Hexagonal hierarchical geospatial indexing system

Stars: 6.5k
Forks: 627
Open beginner issues: 0
Indexed issues: 135
Avg merge: 3d 21h
Merged PRs (30d): 6

Dominant language: C
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

Open All

135 open issues indexed

gridRing silently returns wrong results when the ring encircles pentagons without touching one Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

uber/h3#1241 · Opened Sep 17, 2026
fuzzerPolygonToCellsExperimentalNoHoles times out on master: out-of-range vertex latitude produces a huge bbox estimate Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

uber/h3#1225 · 1 comment · Opened Aug 20, 2026
unchecked signed accumulation in size calculation functions Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

uber/h3#1204 · 2 comments · Opened Jul 30, 2026
Outdated dependencies (vulnerabilities) Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

uber/h3#1203 · 4 comments · Opened Jul 30, 2026
A native H3 way of doing Voronoi Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

uber/h3#1169 · 1 comment · Opened Jun 3, 2026
Requesting new containment mode: h3.ContainmentEdge Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

uber/h3#1160 · Opened May 9, 2026
`gridPathCells` can fail Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

uber/h3#1150 · 2 comments · Opened Apr 6, 2026
Replace `cellsToLinkedMultiPolygon` implementation with `cellsToMultiPolygon` Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

uber/h3#1127 · Opened Feb 15, 2026
Directed Edge disagrees with Hex2d i-direction Neighbor Resolution for the North Pole Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

uber/h3#1118 · Opened Feb 6, 2026
Consider using sorting instead of hashing to identify symmetric edge pairs Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

uber/h3#1117 · Opened Jan 25, 2026
Consider alternative construction of globe multi polygon Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

uber/h3#1110 · 3 comments · Opened Dec 18, 2025
Consider adding function to expose H3_ERROR_END in public API Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

uber/h3#1109 · Opened Dec 17, 2025
Consider raising error when edge arcs close to 180 degrees are encountered Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

uber/h3#1108 · Opened Dec 17, 2025
Consider exposing "nextCell" or "cellToLastChild" function Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

uber/h3#1106 · 1 comment · Opened Dec 11, 2025
Add `cellsToMultiPolygon` function Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

uber/h3#1103 · 1 comment · Opened Dec 1, 2025
Warning: System::load invoked from unnamed module when using h3 on Java 25 Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

uber/h3#1097 · Opened Nov 19, 2025
OGC-DGGRS-API feedback. New function getGeometricSubZones Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

uber/h3#1095 · 9 comments · 2 reactions · Opened Nov 13, 2025
Documentation: Add comparison to A5 Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

uber/h3#1081 · 1 comment · Opened Nov 5, 2025
Add edgeToVertexes function Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

uber/h3#1071 · Opened Oct 18, 2025
Docs page for hierarchical (non-) containment Open

Difficulty 2/5 Half a day Newbie friendliness 48/100

uber/h3#1057 · Opened Oct 13, 2025
"polygonToCells" fails near poles Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

uber/h3#1051 · Opened Oct 3, 2025
"cellsToMultiPolygon" occasionally produces degenerate polygons with only 1 vertex Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

uber/h3#1049 · 4 comments · Opened Oct 1, 2025
"polygonToCellsExperimental" can give incorrect results near antimeridian Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

uber/h3#1048 · 1 comment · Opened Oct 1, 2025
Two neighbor cells give error with "cellsToLinkedMultiPolygon" Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

uber/h3#1046 · 6 comments · Opened Sep 29, 2025
Global Coordinate System Using H3 Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

uber/h3#1034 · 1 comment · Opened Aug 7, 2025
cells_to_multi_polygon errors near the poles Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

uber/h3#1029 · Opened Jul 21, 2025
Be clearer about degrees vs radians Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

uber/h3#1028 · 2 comments · 1 reaction · Opened Jul 8, 2025
Ctest of testPolygonToCellsReportedExperimental_test103 failed on s390x Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

uber/h3#1019 · 1 comment · Opened Jun 22, 2025
Unexpected zero J-coordinate in local ijk+ when resolution > 0 Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

uber/h3#1003 · 1 comment · Opened Apr 24, 2025
polygonToCells returns Error1 (specific error is not available) but polygonToCellsExperimental works fine Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

uber/h3#1000 · 1 comment · Opened Mar 22, 2025
CLA check broken Open

uber-oss

Difficulty 3/5 1-2 days Newbie friendliness 15/100

uber/h3#997 · Opened Mar 14, 2025
website: it is not possible to visualize the res 15 grid Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

uber/h3#993 · 1 comment · Opened Mar 13, 2025
Inline _isBaseCellPentagon Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 38/100

uber/h3#984 · Opened Mar 9, 2025
Documentation: missing comparison against htm (Hierarchical Triangular Mesh) Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

uber/h3#982 · Opened Mar 9, 2025
Update clang and add ARM msan Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

uber/h3#979 · Opened Mar 6, 2025
[PR Proposal] Add support for min_resolution in compactCells Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

uber/h3#961 · 3 comments · Opened Jan 15, 2025
Add h3ronpy to bindings Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

uber/h3#952 · 1 reaction · Opened Dec 10, 2024
polygonToCells The operation failed but a more specific error is not available Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

uber/h3#945 · 6 comments · Opened Nov 26, 2024
h3_polygon_to_cells: Handling of invalid geometry: 5 point geometry = 2,364,092 hex_ids Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

uber/h3#926 · Opened Oct 10, 2024
`cellsToLinkedMultiPolygon` bug on Apple Silicon Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

uber/h3#917 · 2 comments · Opened Sep 27, 2024
Bug when compacting sets of resolution 1 cells Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

uber/h3#915 · 1 comment · Opened Sep 26, 2024
customized resolution Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

uber/h3#911 · 1 comment · Opened Sep 24, 2024
The maximum edge length of H3 cell at different precisions Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

uber/h3#901 · 1 comment · Opened Aug 29, 2024
novice h3-js lib installation&test issue Open

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

uber/h3#892 · 2 comments · Opened Jul 26, 2024
cellToVertex result seems to be incorrect? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

uber/h3#850 · 3 comments · Opened Jul 2, 2024
Completely cover a polygon with H3 cells using H3 extension for PostGIS Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

uber/h3#842 · 2 comments · 3 reactions · Opened May 22, 2024
Example H3 data sets Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

uber/h3#841 · 3 comments · Opened May 18, 2024
Expose cellToChildrenSize in bindings Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

uber/h3#824 · 1 comment · Opened Mar 27, 2024
Add function for returning the H3 indices of each endpoint of a directed edge Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

uber/h3#808 · 5 comments · Opened Dec 29, 2023
cell_to_child_pos() version 4 of the Python API client Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

uber/h3#794 · 3 comments · Opened Oct 27, 2023

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