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README.md

GeoService in Go

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A geocoding service developed in Go's way, idiomatic and elegant, not just in golang.

This product is designed to open to any Geocoding service. Based on it,

clients are implemented in ~50 LoC each.

It allows you to switch from one service to another by changing only 1 line, or enjoy all the free quota (requests/sec, day, month...) from them at the same time. Just like this.

package main

import (
	"fmt"
	"os"

	"github.com/codingsince1985/geo-golang"
	"github.com/codingsince1985/geo-golang/arcgis"
	"github.com/codingsince1985/geo-golang/bing"
	"github.com/codingsince1985/geo-golang/chained"
	"github.com/codingsince1985/geo-golang/geocod"
	"github.com/codingsince1985/geo-golang/google"
	"github.com/codingsince1985/geo-golang/here"
	"github.com/codingsince1985/geo-golang/locationiq"
	"github.com/codingsince1985/geo-golang/mapbox"
	"github.com/codingsince1985/geo-golang/mapquest/nominatim"
	"github.com/codingsince1985/geo-golang/mapquest/open"
	"github.com/codingsince1985/geo-golang/mapzen"
	"github.com/codingsince1985/geo-golang/opencage"
	"github.com/codingsince1985/geo-golang/openstreetmap"
	"github.com/codingsince1985/geo-golang/pickpoint"
	"github.com/codingsince1985/geo-golang/tomtom"
)

const (
	addr     = "Melbourne VIC"
	lat, lng = -37.813611, 144.963056
	radius   = 50
	zoom     = 18
)

func main() {
	ExampleGeocoder()
}

// ExampleGeocoder demonstrates the different geocoding services
func ExampleGeocoder() {
	fmt.Println("Google Geocoding API")
	try(google.Geocoder(os.Getenv("GOOGLE_API_KEY")))

	fmt.Println("Mapquest Nominatim")
	try(nominatim.Geocoder(os.Getenv("MAPQUEST_NOMINATIM_KEY")))

	fmt.Println("Mapquest Open streetmaps")
	try(open.Geocoder(os.Getenv("MAPQUEST_OPEN_KEY")))

	fmt.Println("OpenCage Data")
	try(opencage.Geocoder(os.Getenv("OPENCAGE_API_KEY")))

	fmt.Println("HERE API")
	try(here.Geocoder(os.Getenv("HERE_APP_ID"), os.Getenv("HERE_APP_CODE"), radius))

	fmt.Println("Bing Geocoding API")
	try(bing.Geocoder(os.Getenv("BING_API_KEY")))

	fmt.Println("Mapbox API")
	try(mapbox.Geocoder(os.Getenv("MAPBOX_API_KEY")))

	fmt.Println("OpenStreetMap")
	try(openstreetmap.Geocoder())

	fmt.Println("PickPoint")
	try(pickpoint.Geocoder(os.Getenv("PICKPOINT_API_KEY")))

	fmt.Println("LocationIQ")
	try(locationiq.Geocoder(os.Getenv("LOCATIONIQ_API_KEY"), zoom))

	fmt.Println("ArcGIS")
	try(arcgis.Geocoder(os.Getenv("ARCGIS_TOKEN")))

	fmt.Println("geocod.io")
	try(geocod.Geocoder(os.Getenv("GEOCOD_API_KEY")))

	fmt.Println("Mapzen")
	try(mapzen.Geocoder(os.Getenv("MAPZEN_API_KEY")))

	fmt.Println("TomTom")
	try(tomtom.Geocoder(os.Getenv("TOMTOM_API_KEY")))

	// Chained geocoder will fallback to subsequent geocoders
	fmt.Println("ChainedAPI[OpenStreetmap -> Google]")
	try(chained.Geocoder(
		openstreetmap.Geocoder(),
		google.Geocoder(os.Getenv("GOOGLE_API_KEY")),
	))
}

func try(geocoder geo.Geocoder) {
	location, _ := geocoder.Geocode(addr)
	if location != nil {
		fmt.Printf("%s location is (%.6f, %.6f)\n", addr, location.Lat, location.Lng)
	} else {
		fmt.Println("got <nil> location")
	}
	address, _ := geocoder.ReverseGeocode(lat, lng)
	if address != nil {
		fmt.Printf("Address of (%.6f,%.6f) is %s\n", lat, lng, address.FormattedAddress)
		fmt.Printf("Detailed address: %#v\n", address)
	} else {
		fmt.Println("got <nil> address")
	}
	fmt.Print("\n")
}

Result

Google Geocoding API
Melbourne VIC location is (-37.813611, 144.963056)
Address of (-37.813611,144.963056) is 197 Elizabeth St, Melbourne VIC 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"197 Elizabeth St, Melbourne VIC 3000, Australia", Street:"Elizabeth Street", HouseNumber:"197", Suburb:"", Postcode:"3000", State:"Victoria", StateDistrict:"Melbourne City", County:"", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

Mapquest Nominatim
Melbourne VIC location is (-37.814218, 144.963161)
Address of (-37.813611,144.963056) is Melbourne's GPO, Postal Lane, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"Melbourne's GPO, Postal Lane, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia", Street:"Postal Lane", HouseNumber:"", Suburb:"Melbourne", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"City of Melbourne", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

Mapquest Open streetmaps
Melbourne VIC location is (-37.814218, 144.963161)
Address of (-37.813611,144.963056) is Elizabeth Street, 3000, Melbourne, Victoria, AU
Detailed address: &geo.Address{FormattedAddress:"Elizabeth Street, 3000, Melbourne, Victoria, AU", Street:"Elizabeth Street", HouseNumber:"", Suburb:"", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"", CountryCode:"AU", City:"Melbourne"}

OpenCage Data
Melbourne VIC location is (-37.814217, 144.963161)
Address of (-37.813611,144.963056) is Melbourne's GPO, Postal Lane, Melbourne VIC 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"Melbourne's GPO, Postal Lane, Melbourne VIC 3000, Australia", Street:"Postal Lane", HouseNumber:"", Suburb:"Melbourne (3000)", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"City of Melbourne", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

HERE API
Melbourne VIC location is (-37.817530, 144.967150)
Address of (-37.813611,144.963056) is 197 Elizabeth St, Melbourne VIC 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"197 Elizabeth St, Melbourne VIC 3000, Australia", Street:"Elizabeth St", HouseNumber:"197", Suburb:"", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AUS", City:"Melbourne"}

Bing Geocoding API
Melbourne VIC location is (-37.824299, 144.977997)
Address of (-37.813611,144.963056) is Elizabeth St, Melbourne, VIC 3000
Detailed address: &geo.Address{FormattedAddress:"Elizabeth St, Melbourne, VIC 3000", Street:"Elizabeth St", HouseNumber:"", Suburb:"", Postcode:"3000", State:"", StateDistrict:"", County:"", Country:"Australia", CountryCode:"", City:"Melbourne"}

Mapbox API
Melbourne VIC location is (-37.814200, 144.963200)
Address of (-37.813611,144.963056) is Elwood Park Playground, Melbourne, Victoria 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"Elwood Park Playground, Melbourne, Victoria 3000, Australia", Street:"Elwood Park Playground", HouseNumber:"", Suburb:"", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

OpenStreetMap
Melbourne VIC location is (-37.814217, 144.963161)
Address of (-37.813611,144.963056) is Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia", Street:"Postal Lane", HouseNumber:"", Suburb:"Melbourne", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

PickPoint
Melbourne VIC location is (-37.814217, 144.963161)
Address of (-37.813611,144.963056) is Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia", Street:"Postal Lane", HouseNumber:"", Suburb:"Melbourne", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

LocationIQ
Melbourne VIC location is (-37.814217, 144.963161)
Address of (-37.813611,144.963056) is Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia", Street:"Postal Lane", HouseNumber:"", Suburb:"Melbourne", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

ArcGIS
Melbourne VIC location is (-37.817530, 144.967150)
Address of (-37.813611,144.963056) is Melbourne's Gpo
Detailed address: &geo.Address{FormattedAddress:"Melbourne's Gpo", Street:"350 Bourke Street Mall", HouseNumber:"350", Suburb:"", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"", CountryCode:"AUS", City:""}

geocod.io
Melbourne VIC location is (28.079357, -80.623618)
got <nil> address

Mapzen
Melbourne VIC location is (45.551136, 11.533929)
Address of (-37.813611,144.963056) is Stop 3: Bourke Street Mall, Bourke Street, Melbourne, Australia
Detailed address: &geo.Address{FormattedAddress:"Stop 3: Bourke Street Mall, Bourke Street, Melbourne, Australia", Street:"", HouseNumber:"", Suburb:"", Postcode:"", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AUS", City:""}

TomTom
Melbourne VIC location is (-37.815340, 144.963230)
Address of (-37.813611,144.963056) is Doyles Road, Elaine, West Central Victoria, Victoria, 3334
Detailed address: &geo.Address{FormattedAddress:"Doyles Road, Elaine, West Central Victoria, Victoria, 3334", Street:"Doyles Road", HouseNumber:"", Suburb:"", Postcode:"3334", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AU", City:"Elaine"}

ChainedAPI[OpenStreetmap -> Google]
Melbourne VIC location is (-37.814217, 144.963161)
Address of (-37.813611,144.963056) is Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia
Detailed address: &geo.Address{FormattedAddress:"Melbourne's GPO, Postal Lane, Chinatown, Melbourne, City of Melbourne, Greater Melbourne, Victoria, 3000, Australia", Street:"Postal Lane", HouseNumber:"", Suburb:"Melbourne", Postcode:"3000", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AU", City:"Melbourne"}

License

geo-golang is distributed under the terms of the MIT license. See LICENSE for details.