node-geobatch

Batch geocode addresses from multiple sources. It limits the calls to not run in OVER_QUERY_LIMIT by the Google Maps API. Results are cached locally to prevent duplicate geocoding requests.

Usage

Install GeoBatch:

npm install geobatch --save

Then include and use it in your project:

var GeoBatch = require('geobatch'),
  geoBatch = new GeoBatch();

geoBatch.geocode(['Hamburg', 'Berlin'])
  .on('data', function(data) {
    console.log('Geocode result', data);
  })
  .on('end', function() {
    console.log('Finished!');
  });

geoBatch.geocode also accepts a stream as input.

Result

The data in the example above is an object like this:

{
  error: null,
  address: 'Hamburg',
  input: 'Hamburg',
  location: { lat: 53.5510846, lng: 9.9936818 },
  result: {
    address_components: [ … ],
    formatted_address: 'Hamburg, Germany',
    geometry: {
      bounds: { northeast: [Object], southwest: [Object] },
      location: { lat: 53.5510846, lng: 9.9936818 },
      location_type: 'APPROXIMATE',
      viewport: { northeast: [Object], southwest: [Object] } },
      place_id: 'ChIJuRMYfoNhsUcRoDrWe_I9JgQ',
      types: [ 'locality', 'political' ]
    }
  },
  results: [{
    address_components: [ … ],
    formatted_address: 'Hamburg, Germany',
    geometry: {
      bounds: { northeast: [Object], southwest: [Object] },
      location: { lat: 53.5510846, lng: 9.9936818 },
      location_type: 'APPROXIMATE',
      viewport: { northeast: [Object], southwest: [Object] } },
      place_id: 'ChIJuRMYfoNhsUcRoDrWe_I9JgQ',
      types: [ 'locality', 'political' ]
    }]
  },
  total: 2,
  current: 1,
  pending: 1,
  percent: 50,
  estimatedDuration: 189
}

error

Type string. Contains the error message. Default null.

address

Type string. Contains the address that was put into the geocoder. Default ''.

input

Contains the original input. This was the input to the accessor function to get the address.

location

Type Object. The coordinates returned from the Google Maps Geocoding API. Default {}.

result

Type Object. The complete first result item from the Google Maps Geocoding API. Default {}.

results

Type Array. The complete result from the Google Maps Geocoding API.

total

Type Number. The total number of addresses to geocode. (Not included if stream was provided.)

current

Type Number. The index of the current geocoded address.

pending

Type Number. The number of addresses to still geocode. (Not included if stream was provided.)

percent

Type Number. The percentage that got geocoded already. (Not included if stream was provided.)

estimatedDuration

Type Number. The estimated duration based on past progress. In milliseconds. (Not included if stream was provided.)

Options

You can pass in options on initalization of the GeoBatch:

new GeoBatch({
  clientId: 'myClientId',
  privateKey: 'myPrivateKey',
  apiKey: 'myApiKey',
  cacheFile: 'myGeocache.db',
  accessor: myAccessorFunction,
  maxRetries: 1,
  queriesPerSecond: 50
});

clientId

Type String. The Google Maps Client ID, if you are using Google for Work. If this is passed in, the privateKey is also required. You must provide either a clientId and privateKey, or an apiKey. Default is null.

privateKey

Type String. The Google Maps private key, if you are using Google for Work. If this is passed in, the clientId is also required. Default is null.

apiKey

Type String. The Google Maps API key. If this is passed, neither clientId nor privateKey may be set. You must provide either a clientId and privateKey, or an apiKey. Default is null.

cacheFile

Type String. The path of the cache file, in which the geocoding responses are cached. Default is geocache.db.

accessor

Type Function. An accessor function that extracts the address data from the provided input. Defaults to:

function(address) {
  return address;
}

maxRetries

Type Number. This option defines how often Geobatch will retry geocoding if the query limit was exceeded. Default is 0.

queriesPerSecond

Type Number. The maximum number of requests per second. This number must be between 1 and 50 (inclusive). Please note that due to varying network latency the maximum value of 50 QPS will result in occasional OVER_QUERY_LIMIT errors. Use a moderate value (the default is safe), or the maxRetries option. Default is 35.

Contribution

Make sure to follow the Git Commit Conventions! Test and lint the code and adapt to the code style used in the project.

Clone the repository and run:

npm install

To run the tests, run:

npm test

To make a release, run:

npm run release patch|minor|major

License (MIT)

Copyright © 2015 Ubilabs GmbH

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.