haversine's Introduction

Haversine

A simple haversine formula module for Node.js

Installation

$ npm install haversine

Usage

haversine (start, end, options)

const haversine = require('haversine')

const start = {
  latitude: 30.849635,
  longitude: -83.24559
}

const end = {
  latitude: 27.950575,
  longitude: -82.457178
}

console.log(haversine(start, end))
console.log(haversine(start, end, {unit: 'mile'}))
console.log(haversine(start, end, {unit: 'meter'}))
console.log(haversine(start, end, {threshold: 1}))
console.log(haversine(start, end, {threshold: 1, unit: 'mile'}))
console.log(haversine(start, end, {threshold: 1, unit: 'meter'}))

api

options.unit - Unit of measurement applied to result (default km, available km, mile, meter, nmi)
options.threshold - If passed, will result in library returning boolean value of whether or not the start and end points are within that supplied threshold. (default null)
options.format - The format of start and end coordinate arguments. See table below for available values. (default null)

Format	Example
`undefined` (default)	`{ latitude: 30.849635, longitude: -83.24559 }`
`[lat,lon]`	`[30.849635, -83.24559]`
`[lon,lat]`	`[-83.24559, 30.849635]`
`{lon,lat}`	`{ lat: 30.849635, lon: -83.24559 }`
`{lat,lng}`	`{ lat: 30.849635, lng: -83.24559 }`
`geojson`	`{ type: 'Feature', geometry: { coordinates: [-83.24559, 30.849635] } }`