h3-polyfill

h3-polyfill is a library and a command line interface to Uber h3 polyfill.

It takes an input polygon as a GeoJSON file and outputs hex as a GeoJSON polygon feature collection.

Installation

npm i h3-polyfill

Usage

const h3Polyfill = require("h3-polyfill");
 
const polygon = {
  type: "Feature",
  properties: {},
  geometry: {
    type: "Polygon",
    coordinates: [
      [
        [-122.40898669999721, 37.81331899998324],
        [-122.35447369999936, 37.71980619999785],
        [-122.4798767000009, 37.815157199999845],
        [-122.40898669999721, 37.81331899998324]
      ]
    ]
  }
};
 
const hex = h3Polyfill(polygon, 7);

CLI Usage

Usage: h3-polyfill <polygon.geojson> <resolution>

Example:

npx h3-polyfill polygon.geojson 7 > hex.geojson