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Repository Details

h3-js provides a JavaScript version of H3, a hexagon-based geospatial indexing system.

H3 Logo

h3-js

Build Status Coverage Status License npm version H3 Version

The h3-js library provides a pure-JavaScript version of the H3 Core Library, a hexagon-based geographic grid system. It can be used either in Node >= 6 or in the browser. The core library is transpiled from C using emscripten, offering full parity with the C API and highly efficient operations.

For more information on H3 and for the full API documentation, please see the H3 Documentation.

Install

npm install h3-js

Usage

πŸŽ‰ Note: The following usage docs apply to H3 v4, which was released on August 23, 2022.

The library uses ES6 modules. Bundles for Node and the browser are built to the dist folder.

Import

ES6 usage:

import {latLngToCell} from "h3-js";

CommonJS usage:

const h3 = require("h3-js");

Pre-bundled script (library is available as an h3 global):

<script src="https://unpkg.com/h3-js"></script>

Core functions

// Convert a lat/lng point to a hexagon index at resolution 7
const h3Index = h3.latLngToCell(37.3615593, -122.0553238, 7);
// -> '87283472bffffff'

// Get the center of the hexagon
const hexCenterCoordinates = h3.cellToLatLng(h3Index);
// -> [37.35171820183272, -122.05032565263946]

// Get the vertices of the hexagon
const hexBoundary = h3.cellToBoundary(h3Index);
// -> [ [37.341099093235684, -122.04156135164334 ], ...]

Useful algorithms

// Get all neighbors within 1 step of the hexagon
const disk = h3.gridDisk(h3Index, 1);
// -> ['87283472bffffff', '87283472affffff', ...]

// Get the set of hexagons within a polygon
const polygon = [
    [37.813318999983238, -122.4089866999972145],
    [37.7198061999978478, -122.3544736999993603],
    [37.8151571999998453, -122.4798767000009008]
];
const hexagons = h3.polygonToCells(polygon, 7);
// -> ['872830828ffffff', '87283082effffff', ...]

// Get the outline of a set of hexagons, as a GeoJSON-style MultiPolygon
const coordinates = h3.cellsToMultiPolygon(hexagons, true);
// -> [[[
//      [-122.37681938644465, 37.76546768434345],
//      [-122.3856345540363,37.776004200673846],
//      ...
//    ]]]

API Reference

h3


h3.UNITS

Length/Area units

Properties

Name Type
m string
m2 string
km string
km2 string
rads string
rads2 string

h3.h3IndexToSplitLong(h3Index) β‡’ SplitLong

Convert an H3 index (64-bit hexidecimal string) into a "split long" - a pair of 32-bit ints

Returns: SplitLong - A two-element array with 32 lower bits and 32 upper bits

Param Type Description
h3Index H3IndexInput H3 index to check

h3.splitLongToH3Index(lower, upper) β‡’ H3Index

Get a H3 index string from a split long (pair of 32-bit ints)

Returns: H3Index - H3 index

Param Type Description
lower number Lower 32 bits
upper number Upper 32 bits

h3.isValidCell(h3Index) β‡’ boolean

Whether a given string represents a valid H3 index

Returns: boolean - Whether the index is valid

Param Type Description
h3Index H3IndexInput H3 index to check

h3.isPentagon(h3Index) β‡’ boolean

Whether the given H3 index is a pentagon

Returns: boolean - isPentagon

Param Type Description
h3Index H3IndexInput H3 index to check

h3.isResClassIII(h3Index) β‡’ boolean

Whether the given H3 index is in a Class III resolution (rotated versus the icosahedron and subject to shape distortion adding extra points on icosahedron edges, making them not true hexagons).

Returns: boolean - isResClassIII

Param Type Description
h3Index H3IndexInput H3 index to check

h3.getBaseCellNumber(h3Index) β‡’ number

Get the number of the base cell for a given H3 index

Returns: number - Index of the base cell (0-121)

Param Type Description
h3Index H3IndexInput H3 index to get the base cell for

h3.getIcosahedronFaces(h3Index) β‡’ Array.<number>

Get the indices of all icosahedron faces intersected by a given H3 index

Returns: Array.<number> - Indices (0-19) of all intersected faces
Throws:

  • H3Error If input is invalid
Param Type Description
h3Index H3IndexInput H3 index to get faces for

h3.getResolution(h3Index) β‡’ number

Returns the resolution of an H3 index

Returns: number - The number (0-15) resolution, or -1 if invalid

Param Type Description
h3Index H3IndexInput H3 index to get resolution

h3.latLngToCell(lat, lng, res) β‡’ H3Index

Get the hexagon containing a lat,lon point

Returns: H3Index - H3 index
Throws:

  • H3Error If input is invalid
Param Type Description
lat number Latitude of point
lng number Longtitude of point
res number Resolution of hexagons to return

h3.cellToLatLng(h3Index) β‡’ CoordPair

Get the lat,lon center of a given hexagon

Returns: CoordPair - Point as a [lat, lng] pair
Throws:

  • H3Error If input is invalid
Param Type Description
h3Index H3IndexInput H3 index

h3.cellToBoundary(h3Index, [formatAsGeoJson]) β‡’ Array.<CoordPair>

Get the vertices of a given hexagon (or pentagon), as an array of [lat, lng] points. For pentagons and hexagons on the edge of an icosahedron face, this function may return up to 10 vertices.

Returns: Array.<CoordPair> - Array of [lat, lng] pairs
Throws:

  • H3Error If input is invalid
Param Type Description
h3Index H3IndexInput H3 index
[formatAsGeoJson] boolean Whether to provide GeoJSON output: [lng, lat], closed loops

h3.cellToParent(h3Index, res) β‡’ H3Index

Get the parent of the given hexagon at a particular resolution

Returns: H3Index - H3 index of parent, or null for invalid input
Throws:

  • H3Error If input is invalid
Param Type Description
h3Index H3IndexInput H3 index to get parent for
res number Resolution of hexagon to return

h3.cellToChildren(h3Index, res) β‡’ Array.<H3Index>

Get the children/descendents of the given hexagon at a particular resolution

Returns: Array.<H3Index> - H3 indexes of children, or empty array for invalid input
Throws:

  • H3Error If resolution is invalid or output is too large for JS
Param Type Description
h3Index H3IndexInput H3 index to get children for
res number Resolution of hexagons to return

h3.cellToChildrenSize(h3Index, res) β‡’ number

Get the number of children for a cell at a given resolution

Returns: number - Number of children at res for the given cell
Throws:

  • H3Error If cell or parentRes are invalid
Param Type Description
h3Index H3IndexInput H3 index to get child count for
res number Child resolution

h3.cellToCenterChild(h3Index, res) β‡’ H3Index

Get the center child of the given hexagon at a particular resolution

Returns: H3Index - H3 index of child, or null for invalid input
Throws:

  • H3Error If resolution is invalid
Param Type Description
h3Index H3IndexInput H3 index to get center child for
res number Resolution of cell to return

h3.cellToChildPos(h3Index, parentRes) β‡’ number

Get the position of the cell within an ordered list of all children of the cell's parent at the specified resolution.

Returns: number - Position of child within parent at parentRes
Throws:

  • H3Error If cell or parentRes are invalid
Param Type Description
h3Index H3IndexInput H3 index to get child pos for
parentRes number Resolution of reference parent

h3.childPosToCell(childPos, h3Index, childRes) β‡’ H3Index

Get the child cell at a given position within an ordered list of all children at the specified resolution

Returns: H3Index - H3 index of child
Throws:

  • H3Error If input is invalid
Param Type Description
childPos number Position of the child cell to get
h3Index H3IndexInput H3 index of the parent cell
childRes number Resolution of child cell to return

h3.gridDisk(h3Index, ringSize) β‡’ Array.<H3Index>

Get all hexagons in a k-ring around a given center. The order of the hexagons is undefined.

Returns: Array.<H3Index> - H3 indexes for all hexagons in ring
Throws:

  • H3Error If input is invalid or output is too large for JS
Param Type Description
h3Index H3IndexInput H3 index of center hexagon
ringSize number Radius of k-ring

h3.gridDiskDistances(h3Index, ringSize) β‡’ Array.<Array.<H3Index>>

Get all hexagons in a k-ring around a given center, in an array of arrays ordered by distance from the origin. The order of the hexagons within each ring is undefined.

Returns: Array.<Array.<H3Index>> - Array of arrays with H3 indexes for all hexagons each ring
Throws:

  • H3Error If input is invalid or output is too large for JS
Param Type Description
h3Index H3IndexInput H3 index of center hexagon
ringSize number Radius of k-ring

h3.gridRingUnsafe(h3Index, ringSize) β‡’ Array.<H3Index>

Get all hexagons in a hollow hexagonal ring centered at origin with sides of a given length. Unlike kRing, this function will throw an error if there is a pentagon anywhere in the ring.

Returns: Array.<H3Index> - H3 indexes for all hexagons in ring
Throws:

  • Error If the algorithm could not calculate the ring
  • H3Error If input is invalid
Param Type Description
h3Index H3IndexInput H3 index of center hexagon
ringSize number Radius of ring

h3.polygonToCells(coordinates, res, [isGeoJson]) β‡’ Array.<H3Index>

Get all hexagons with centers contained in a given polygon. The polygon is specified with GeoJson semantics as an array of loops. Each loop is an array of [lat, lng] pairs (or [lng, lat] if isGeoJson is specified). The first loop is the perimeter of the polygon, and subsequent loops are expected to be holes.

Returns: Array.<H3Index> - H3 indexes for all hexagons in polygon
Throws:

  • H3Error If input is invalid or output is too large for JS
Param Type Description
coordinates Array.<Array.<number>> | Array.<Array.<Array.<number>>> Array of loops, or a single loop
res number Resolution of hexagons to return
[isGeoJson] boolean Whether to expect GeoJson-style [lng, lat] pairs instead of [lat, lng]

h3.cellsToMultiPolygon(h3Indexes, [formatAsGeoJson]) β‡’ Array.<Array.<Array.<CoordPair>>>

Get the outlines of a set of H3 hexagons, returned in GeoJSON MultiPolygon format (an array of polygons, each with an array of loops, each an array of coordinates). Coordinates are returned as [lat, lng] pairs unless GeoJSON is requested.

It is the responsibility of the caller to ensure that all hexagons in the set have the same resolution and that the set contains no duplicates. Behavior is undefined if duplicates or multiple resolutions are present, and the algorithm may produce unexpected or invalid polygons.

Returns: Array.<Array.<Array.<CoordPair>>> - MultiPolygon-style output.
Throws:

  • H3Error If input is invalid
Param Type Description
h3Indexes Array.<H3IndexInput> H3 indexes to get outlines for
[formatAsGeoJson] boolean Whether to provide GeoJSON output: [lng, lat], closed loops

h3.compactCells(h3Set) β‡’ Array.<H3Index>

Compact a set of hexagons of the same resolution into a set of hexagons across multiple levels that represents the same area.

Returns: Array.<H3Index> - Compacted H3 indexes
Throws:

  • H3Error If the input is invalid (e.g. duplicate hexagons)
Param Type Description
h3Set Array.<H3IndexInput> H3 indexes to compact

h3.uncompactCells(compactedSet, res) β‡’ Array.<H3Index>

Uncompact a compacted set of hexagons to hexagons of the same resolution

Returns: Array.<H3Index> - The uncompacted H3 indexes
Throws:

  • H3Error If the input is invalid (e.g. invalid resolution)
Param Type Description
compactedSet Array.<H3IndexInput> H3 indexes to uncompact
res number The resolution to uncompact to

h3.areNeighborCells(origin, destination) β‡’ boolean

Whether two H3 indexes are neighbors (share an edge)

Returns: boolean - Whether the hexagons share an edge
Throws:

  • H3Error If the input is invalid
Param Type Description
origin H3IndexInput Origin hexagon index
destination H3IndexInput Destination hexagon index

h3.cellsToDirectedEdge(origin, destination) β‡’ H3Index

Get an H3 index representing a unidirectional edge for a given origin and destination

Returns: H3Index - H3 index of the edge, or null if no edge is shared
Throws:

  • H3Error If the input is invalid
Param Type Description
origin H3IndexInput Origin hexagon index
destination H3IndexInput Destination hexagon index

h3.getDirectedEdgeOrigin(edgeIndex) β‡’ H3Index

Get the origin hexagon from an H3 index representing a unidirectional edge

Returns: H3Index - H3 index of the edge origin
Throws:

  • H3Error If the input is invalid
Param Type Description
edgeIndex H3IndexInput H3 index of the edge

h3.getDirectedEdgeDestination(edgeIndex) β‡’ H3Index

Get the destination hexagon from an H3 index representing a unidirectional edge

Returns: H3Index - H3 index of the edge destination
Throws:

  • H3Error If the input is invalid
Param Type Description
edgeIndex H3IndexInput H3 index of the edge

h3.isValidDirectedEdge(edgeIndex) β‡’ boolean

Whether the input is a valid unidirectional edge

Returns: boolean - Whether the index is valid

Param Type Description
edgeIndex H3IndexInput H3 index of the edge

h3.directedEdgeToCells(edgeIndex) β‡’ Array.<H3Index>

Get the [origin, destination] pair represented by a unidirectional edge

Returns: Array.<H3Index> - [origin, destination] pair as H3 indexes
Throws:

  • H3Error If the input is invalid
Param Type Description
edgeIndex H3IndexInput H3 index of the edge

h3.originToDirectedEdges(h3Index) β‡’ Array.<H3Index>

Get all of the unidirectional edges with the given H3 index as the origin (i.e. an edge to every neighbor)

Returns: Array.<H3Index> - List of unidirectional edges
Throws:

  • H3Error If the input is invalid
Param Type Description
h3Index H3IndexInput H3 index of the origin hexagon

h3.directedEdgeToBoundary(edgeIndex, [formatAsGeoJson]) β‡’ Array.<CoordPair>

Get the vertices of a given edge as an array of [lat, lng] points. Note that for edges that cross the edge of an icosahedron face, this may return 3 coordinates.

Returns: Array.<CoordPair> - Array of geo coordinate pairs
Throws:

  • H3Error If the input is invalid
Param Type Description
edgeIndex H3IndexInput H3 index of the edge
[formatAsGeoJson] boolean Whether to provide GeoJSON output: [lng, lat]

h3.gridDistance(origin, destination) β‡’ number

Get the grid distance between two hex indexes. This function may fail to find the distance between two indexes if they are very far apart or on opposite sides of a pentagon.

Returns: number - Distance between hexagons
Throws:

  • H3Error If input is invalid or the distance could not be calculated
Param Type Description
origin H3IndexInput Origin hexagon index
destination H3IndexInput Destination hexagon index

h3.gridPathCells(origin, destination) β‡’ Array.<H3Index>

Given two H3 indexes, return the line of indexes between them (inclusive).

This function may fail to find the line between two indexes, for example if they are very far apart. It may also fail when finding distances for indexes on opposite sides of a pentagon.

Notes:

  • The specific output of this function should not be considered stable across library versions. The only guarantees the library provides are that the line length will be h3Distance(start, end) + 1 and that every index in the line will be a neighbor of the preceding index.
  • Lines are drawn in grid space, and may not correspond exactly to either Cartesian lines or great arcs.

Returns: Array.<H3Index> - H3 indexes connecting origin and destination
Throws:

  • H3Error If input is invalid or the line cannot be calculated
Param Type Description
origin H3IndexInput Origin hexagon index
destination H3IndexInput Destination hexagon index

h3.cellToLocalIj(origin, destination) β‡’ CoordIJ

Produces IJ coordinates for an H3 index anchored by an origin.

  • The coordinate space used by this function may have deleted regions or warping due to pentagonal distortion.
  • Coordinates are only comparable if they come from the same origin index.
  • Failure may occur if the index is too far away from the origin or if the index is on the other side of a pentagon.
  • This function is experimental, and its output is not guaranteed to be compatible across different versions of H3.

Returns: CoordIJ - Coordinates as an {i, j} pair
Throws:

  • H3Error If the IJ coordinates cannot be calculated
Param Type Description
origin H3IndexInput Origin H3 index
destination H3IndexInput H3 index for which to find relative coordinates

h3.localIjToCell(origin, coords) β‡’ H3Index

Produces an H3 index for IJ coordinates anchored by an origin.

  • The coordinate space used by this function may have deleted regions or warping due to pentagonal distortion.
  • Coordinates are only comparable if they come from the same origin index.
  • Failure may occur if the index is too far away from the origin or if the index is on the other side of a pentagon.
  • This function is experimental, and its output is not guaranteed to be compatible across different versions of H3.

Returns: H3Index - H3 index at the relative coordinates
Throws:

  • H3Error If the H3 index cannot be calculated
Param Type Description
origin H3IndexInput Origin H3 index
coords CoordIJ Coordinates as an {i, j} pair

h3.greatCircleDistance(latLng1, latLng2, unit) β‡’ number

Great circle distance between two geo points. This is not specific to H3, but is implemented in the library and provided here as a convenience.

Returns: number - Great circle distance
Throws:

  • H3Error If the unit is invalid
Param Type Description
latLng1 Array.<number> Origin coordinate as [lat, lng]
latLng2 Array.<number> Destination coordinate as [lat, lng]
unit string Distance unit (either UNITS.m, UNITS.km, or UNITS.rads)

h3.cellArea(h3Index, unit) β‡’ number

Exact area of a given cell

Returns: number - Cell area
Throws:

  • H3Error If the input is invalid
Param Type Description
h3Index H3IndexInput H3 index of the hexagon to measure
unit string Distance unit (either UNITS.m2, UNITS.km2, or UNITS.rads2)

h3.edgeLength(edge, unit) β‡’ number

Calculate length of a given unidirectional edge

Returns: number - Cell area
Throws:

  • H3Error If the input is invalid
Param Type Description
edge H3IndexInput H3 index of the edge to measure
unit string Distance unit (either UNITS.m, UNITS.km, or UNITS.rads)

h3.getHexagonAreaAvg(res, unit) β‡’ number

Average hexagon area at a given resolution

Returns: number - Average area
Throws:

  • H3Error If the input is invalid
Param Type Description
res number Hexagon resolution
unit string Area unit (either UNITS.m2, UNITS.km2, or UNITS.rads2)

h3.getHexagonEdgeLengthAvg(res, unit) β‡’ number

Average hexagon edge length at a given resolution

Returns: number - Average edge length
Throws:

  • H3Error If the input is invalid
Param Type Description
res number Hexagon resolution
unit string Distance unit (either UNITS.m, UNITS.km, or UNITS.rads)

h3.cellToVertex(h3Index, vertexNum) β‡’ H3Index

Find the index for a vertex of a cell.

Returns: H3Index - Vertex index
Throws:

  • H3Error If the input is invalid
Param Type Description
h3Index H3IndexInput Cell to find the vertex for
vertexNum number Number (index) of the vertex to calculate

h3.cellToVertexes(h3Index) β‡’ Array.<H3Index>

Find the indexes for all vertexes of a cell.

Returns: Array.<H3Index> - All vertex indexes of this cell
Throws:

  • H3Error If the input is invalid
Param Type Description
h3Index H3IndexInput Cell to find all vertexes for

h3.vertexToLatLng(h3Index) β‡’ CoordPair

Get the lat, lng of a given vertex

Returns: CoordPair - Latitude, longitude coordinates of the vertex
Throws:

  • H3Error If the input is invalid
Param Type Description
h3Index H3IndexInput A vertex index

h3.isValidVertex(h3Index) β‡’ boolean

Returns true if the input is a valid vertex index.

Returns: boolean - True if the index represents a vertex

Param Type Description
h3Index H3IndexInput An index to test for being a vertex index

h3.getNumCells(res) β‡’ number

The total count of hexagons in the world at a given resolution. Note that above resolution 8 the exact count cannot be represented in a JavaScript 32-bit number, so consumers should use caution when applying further operations to the output.

Returns: number - Count
Throws:

  • H3Error If the resolution is invalid
Param Type Description
res number Hexagon resolution

h3.getRes0Cells() β‡’ Array.<H3Index>

Get all H3 indexes at resolution 0. As every index at every resolution > 0 is the descendant of a res 0 index, this can be used with h3ToChildren to iterate over H3 indexes at any resolution.

Returns: Array.<H3Index> - All H3 indexes at res 0


h3.getPentagons(res) β‡’ Array.<H3Index>

Get the twelve pentagon indexes at a given resolution.

Returns: Array.<H3Index> - All H3 pentagon indexes at res
Throws:

  • H3Error If the resolution is invalid
Param Type Description
res number Hexagon resolution

h3.degsToRads(deg) β‡’ number

Convert degrees to radians

Returns: number - Value in radians

Param Type Description
deg number Value in degrees

h3.radsToDegs(rad) β‡’ number

Convert radians to degrees

Returns: number - Value in degrees

Param Type Description
rad number Value in radians

h3.H3Index : string

64-bit hexidecimal string representation of an H3 index


h3.H3IndexInput : string | Array.<number>

64-bit hexidecimal string representation of an H3 index, or two 32-bit integers in little endian order in an array.


h3.CoordIJ

Coordinates as an {i, j} pair

Properties

Name Type
i number
j number

h3.H3Error

Custom JS Error instance with an attached error code. Error codes come from the core H3 library and can be found in the H3 docs.

Properties

Name Type
message string
code number

h3.CoordPair : Array.<number>

Pair of lat,lng coordinates (or lng,lat if GeoJSON output is specified)


h3.SplitLong : Array.<number>

Pair of lower,upper 32-bit ints representing a 64-bit value


Legacy API

H3 v4 renamed the majority of the functions in the library. To help ease migration from H3 v3 to H3 v4, we offer a legacy API wrapper at h3-js/legacy, which exports the v4 functions with the v3 names. Users are welcome to use the legacy API wrapper as a transitional support, but are encouraged to upgrade to the H3 v4 API as soon as possible.

Note that the legacy API is not 100% backwards compatible - it's a thin wrapper on top of the v4 functions, so in cases where behavior has changed, the v4 behavior will be used. In particular, many of the v4 functions will throw errors for invalid input, where v3 functions would return null.

Installation:

npm install h3-js

Usage:

import {geoToH3} from 'h3-js/legacy';

const h3Index = geoToH3(37.3615593, -122.0553238, 7);

Development

The h3-js library uses yarn as the preferred package manager. To install the dev dependencies, just run:

yarn

To lint the code:

yarn lint

To run the tests:

yarn test

Code must be formatted with prettier; unformatted code will fail the build. To format all files:

yarn prettier

Benchmarks

The h3-js library includes a basic benchmark suite using Benchmark.js. Because many of the functions may be called over thousands of hexagons in a "hot loop", performance is an important concern. Benchmarks are run against the transpiled ES5 code by default.

To run the benchmarks in Node:

yarn benchmark-node

To run the benchmarks in a browser:

yarn benchmark-browser

Sample Node output (Macbook Pro running Node 12):

isValidCell x 3,650,995 ops/sec Β±1.67% (87 runs sampled)
latLngToCell x 429,982 ops/sec Β±1.39% (86 runs sampled)
cellToLatLng x 1,161,867 ops/sec Β±1.11% (84 runs sampled)
cellToLatLng - integers x 1,555,791 ops/sec Β±1.29% (86 runs sampled)
cellToBoundary x 375,938 ops/sec Β±1.25% (87 runs sampled)
cellToBoundary - integers x 377,181 ops/sec Β±1.18% (85 runs sampled)
getIcosahedronFaces x 992,946 ops/sec Β±1.13% (85 runs sampled)
gridDisk x 194,400 ops/sec Β±1.16% (85 runs sampled)
polygonToCells_9 x 4,919 ops/sec Β±0.79% (87 runs sampled)
polygonToCells_11 x 368 ops/sec Β±0.76% (86 runs sampled)
polygonToCells_10ring x 76.88 ops/sec Β±0.57% (68 runs sampled)
cellsToMultiPolygon x 760 ops/sec Β±1.06% (86 runs sampled)
compactCells x 2,466 ops/sec Β±0.75% (86 runs sampled)
uncompactCells x 715 ops/sec Β±1.15% (85 runs sampled)
areNeighborCells x 1,073,086 ops/sec Β±1.56% (89 runs sampled)
cellsToDirectedEdge x 692,172 ops/sec Β±1.06% (86 runs sampled)
getDirectedEdgeOrigin x 995,390 ops/sec Β±1.60% (85 runs sampled)
getDirectedEdgeDestination x 930,473 ops/sec Β±1.11% (86 runs sampled)
isValidDirectedEdge x 3,505,407 ops/sec Β±1.05% (87 runs sampled)

When making code changes that may affect performance, please run benchmarks against master and then against your branch to identify any regressions.

Transpiling the C Source

The core library is transpiled using emscripten. The easiest way to build from source locally is by using Docker. Make sure Docker is installed, then:

yarn docker-boot
yarn build-emscripten

The build script uses the H3_VERSION file to determine the version of the core library to build. To use a different version of the library (e.g. to test local changes), clone the desired H3 repo to ./h3c and then run yarn docker-emscripten.

Contributing

Pull requests and Github issues are welcome. Please include tests for new work, and keep the library test coverage at 100%. Please note that the purpose of this module is to expose the API of the H3 Core library, so we will rarely accept new features that are not part of that API. New proposed feature work is more appropriate in the core C library or in a new JS library that depends on h3-js.

Before we can merge your changes, you must agree to the Uber Contributor License Agreement.

Versioning

The H3 core library adheres to Semantic Versioning. The h3-js library has a major.minor.patch version scheme. The major and minor version numbers of h3-js are the major and minor version of the bound core library, respectively. The patch version is incremented independently of the core library.

Legal and Licensing

The h3-js library is licensed under the Apache 2.0 License.

DGGRID Copyright (c) 2015 Southern Oregon University

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4,566
star
9

NullAway

A tool to help eliminate NullPointerExceptions (NPEs) in your Java code with low build-time overhead
Java
3,517
star
10

AutoDispose

Automatic binding+disposal of RxJava streams.
Java
3,357
star
11

aresdb

A GPU-powered real-time analytics storage and query engine.
Go
2,981
star
12

react-digraph

A library for creating directed graph editors
JavaScript
2,581
star
13

piranha

A tool for refactoring code related to feature flag APIs
Java
2,219
star
14

orbit

A Python package for Bayesian forecasting with object-oriented design and probabilistic models under the hood.
Python
1,797
star
15

ios-snapshot-test-case

Snapshot view unit tests for iOS
Objective-C
1,763
star
16

petastorm

Petastorm library enables single machine or distributed training and evaluation of deep learning models from datasets in Apache Parquet format. It supports ML frameworks such as Tensorflow, Pytorch, and PySpark and can be used from pure Python code.
Python
1,742
star
17

needle

Compile-time safe Swift dependency injection framework
Swift
1,740
star
18

manifold

A model-agnostic visual debugging tool for machine learning
JavaScript
1,637
star
19

okbuck

OkBuck is a gradle plugin that lets developers utilize the Buck build system on a gradle project.
Java
1,536
star
20

UberSignature

Provides an iOS view controller allowing a user to draw their signature with their finger in a realistic style.
Objective-C
1,283
star
21

nanoscope

An extremely accurate Android method tracing tool.
HTML
1,239
star
22

tchannel

network multiplexing and framing protocol for RPC
Thrift
1,150
star
23

queryparser

Parsing and analysis of Vertica, Hive, and Presto SQL.
Haskell
1,067
star
24

fiber

Distributed Computing for AI Made Simple
Python
1,037
star
25

neuropod

A uniform interface to run deep learning models from multiple frameworks
C++
928
star
26

uReplicator

Improvement of Apache Kafka Mirrormaker
Java
894
star
27

pam-ussh

uber's ssh certificate pam module
Go
832
star
28

ringpop-go

Scalable, fault-tolerant application-layer sharding for Go applications
Go
813
star
29

mockolo

Efficient Mock Generator for Swift
Swift
770
star
30

xviz

A protocol for real-time transfer and visualization of autonomy data
JavaScript
760
star
31

h3-py

Python bindings for H3, a hierarchical hexagonal geospatial indexing system
Python
751
star
32

streetscape.gl

Visualization framework for autonomy and robotics data encoded in XVIZ
JavaScript
702
star
33

react-view

React View is an interactive playground, documentation and code generator for your components.
TypeScript
686
star
34

nebula.gl

A suite of 3D-enabled data editing overlays, suitable for deck.gl
TypeScript
659
star
35

RxDogTag

Automatic tagging of RxJava 2+ originating subscribe points for onError() investigation.
Java
645
star
36

peloton

Unified Resource Scheduler to co-schedule mixed types of workloads such as batch, stateless and stateful jobs in a single cluster for better resource utilization.
Go
636
star
37

motif

A simple DI API for Android / Java
Kotlin
531
star
38

signals-ios

Typeful eventing
Objective-C
526
star
39

tchannel-go

Go implementation of a multiplexing and framing protocol for RPC calls
Go
479
star
40

grafana-dash-gen

grafana dash dash dash gen
JavaScript
473
star
41

marmaray

Generic Data Ingestion & Dispersal Library for Hadoop
Java
473
star
42

zanzibar

A build system & configuration system to generate versioned API gateways.
Go
451
star
43

clay

Clay is a framework for building RESTful backend services using best practices. It’s a wrapper around Flask.
Python
441
star
44

astro

Astro is a tool for managing multiple Terraform executions as a single command
Go
429
star
45

NEAL

πŸ”ŽπŸž A language-agnostic linting platform
OCaml
423
star
46

react-vis-force

d3-force graphs as React Components.
JavaScript
401
star
47

arachne

An always-on framework that performs end-to-end functional network testing for reachability, latency, and packet loss
Go
387
star
48

cadence-web

Web UI for visualizing workflows on Cadence
JavaScript
378
star
49

Python-Sample-Application

Python
375
star
50

rides-ios-sdk

Uber Rides iOS SDK (beta)
Swift
366
star
51

stylist

A stylist creates cool styles. Stylist is a Gradle plugin that codegens a base set of Android XML themes.
Kotlin
355
star
52

storagetapper

StorageTapper is a scalable realtime MySQL change data streaming, logical backup and logical replication service
Go
333
star
53

swift-concurrency

Concurrency utilities for Swift
Swift
323
star
54

RemoteShuffleService

Remote shuffle service for Apache Spark to store shuffle data on remote servers.
Java
316
star
55

cyborg

Display Android Vectordrawables on iOS.
Swift
300
star
56

rides-android-sdk

Uber Rides Android SDK (beta)
Java
287
star
57

h3-go

Go bindings for H3, a hierarchical hexagonal geospatial indexing system
Go
279
star
58

h3-java

Java bindings for H3, a hierarchical hexagonal geospatial indexing system
Java
258
star
59

h3-py-notebooks

Jupyter notebooks for h3-py, a hierarchical hexagonal geospatial indexing system
Jupyter Notebook
244
star
60

hermetic_cc_toolchain

Bazel C/C++ toolchain for cross-compiling C/C++ programs
Starlark
230
star
61

geojson2h3

Conversion utilities between H3 indexes and GeoJSON
JavaScript
214
star
62

artist

An artist creates views. Artist is a Gradle plugin that codegens a base set of Android Views.
Kotlin
210
star
63

tchannel-node

JavaScript
205
star
64

RxCentralBle

A reactive, interface-driven central role Bluetooth LE library for Android
Java
199
star
65

uberalls

Track code coverage metrics with Jenkins and Phabricator
Go
187
star
66

SwiftCodeSan

SwiftCodeSan is a tool that "sanitizes" code written in Swift.
Swift
172
star
67

rides-python-sdk

Uber Rides Python SDK (beta)
Python
170
star
68

doubles

Test doubles for Python.
Python
166
star
69

logtron

A logging MACHINE
JavaScript
158
star
70

cadence-java-client

Java framework for Cadence Workflow Service
Java
139
star
71

athenadriver

A fully-featured AWS Athena database driver (+ athenareader https://github.com/uber/athenadriver/tree/master/athenareader)
Go
138
star
72

cassette

Store and replay HTTP requests made in your Python app
Python
138
star
73

UBTokenBar

Flexible and extensible UICollectionView based TokenBar written in Swift
Swift
136
star
74

tchannel-java

A Java implementation of the TChannel protocol.
Java
133
star
75

bayesmark

Benchmark framework to easily compare Bayesian optimization methods on real machine learning tasks
Python
128
star
76

android-template

This template provides a starting point for open source Android projects at Uber.
Java
127
star
77

crumb

An annotation processor for breadcrumbing metadata across compilation boundaries.
Kotlin
122
star
78

py-find-injection

Look for SQL injection attacks in python source code
Python
119
star
79

rides-java-sdk

Uber Rides Java SDK (beta)
Java
102
star
80

startup-reason-reporter

Reports the reason why an iOS App started.
Objective-C
96
star
81

uber-poet

A mock swift project generator & build runner to help benchmark various module dependency graphs.
Python
94
star
82

cadence-java-samples

Java
93
star
83

charlatan

A Python library to efficiently manage and install database fixtures
Python
89
star
84

swift-abstract-class

Compile-time abstract class validation for Swift
Swift
83
star
85

simple-store

Simple yet performant asynchronous file storage for Android
Java
81
star
86

tchannel-python

Python implementation of the TChannel protocol.
Python
77
star
87

eight-track

Record and playback HTTP requests
JavaScript
70
star
88

client-platform-engineering

A collection of cookbooks, scripts and binaries used to manage our macOS, Ubuntu and Windows endpoints
Ruby
70
star
89

multidimensional_urlencode

Python library to urlencode a multidimensional dict
Python
67
star
90

lint-checks

A set of opinionated and useful lint checks
Kotlin
67
star
91

uncaught-exception

Handle uncaught exceptions.
JavaScript
66
star
92

swift-common

Common code used by various Uber open source projects
Swift
65
star
93

uberscriptquery

UberScriptQuery, a SQL-like DSL to make writing Spark jobs super easy
Java
58
star
94

sentry-logger

A Sentry transport for Winston
JavaScript
55
star
95

graph.gl

WebGL2-Powered Visualization Components for Graph Visualization
JavaScript
50
star
96

nanoscope-art

C++
48
star
97

assume-role-cli

CLI for AssumeRole is a tool for running programs with temporary credentials from AWS's AssumeRole API.
Go
47
star
98

airlock

A prober to probe HTTP based backends for health
JavaScript
47
star
99

mutornadomon

Easy-to-install monitor endpoint for Tornado applications
Python
46
star
100

kafka-logger

A kafka logger for winston
JavaScript
45
star