geo

README

GeoService in Go

Code Coverage

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,

• Google Maps
• MapQuest
  • Nominatim Search
  • Open Geocoding
• OpenCage
• HERE
  • Geocoder API
  • Geocoding and Search API
• Bing
• Mapbox
• OpenStreetMap
• PickPoint
• LocationIQ
• ArcGIS
• geocodio
• Mapzen
• TomTom
• Yandex.Maps
• French API Gouv
• Baidu Map

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/baidu"
	"github.com/codingsince1985/geo-golang/bing"
	"github.com/codingsince1985/geo-golang/chained"
	"github.com/codingsince1985/geo-golang/frenchapigouv"
	"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"
	"github.com/codingsince1985/geo-golang/yandex"
)

const (
	addr         = "Melbourne VIC"
	lat, lng     = -37.813611, 144.963056
	radius       = 50
	zoom         = 18
	addrFR       = "Champs de Mars Paris"
	latFR, lngFR = 48.854395, 2.304770
)

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("Baidu Geocoding API")
	try(google.Geocoder(os.Getenv("BAIDU_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")))

	fmt.Println("Yandex")
	try(yandex.Geocoder(os.Getenv("YANDEX_API_KEY")))

	// To use only with french locations or addresses,
	// or values ​​could be estimated and will be false
	fmt.Println("FrenchAPIGouv")
	tryOnlyFRData(frenchapigouv.Geocoder())

	// 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")
}

func tryOnlyFRData(geocoder geo.Geocoder) {
	location, _ := geocoder.Geocode(addrFR)
	if location != nil {
		fmt.Printf("%s location is (%.6f, %.6f)\n", addrFR, location.Lat, location.Lng)
	} else {
		fmt.Println("got <nil> location")
	}
	address, _ := geocoder.ReverseGeocode(latFR, lngFR)
	if address != nil {
		fmt.Printf("Address of (%.6f,%.6f) is %s\n", latFR, lngFR, 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"}

Baidu Geocoding API
Melbourne VIC location is (31.227015, 121.456967)
Address of (-37.813611,144.963056) is 341 Little Bourke Street, Melbourne, Victoria, Australia
Detailed address: &geo.Address{FormattedAddress:"341 Little Bourke Street, Melbourne, Victoria, Australia", Street:"Little Bourke Street", HouseNumber:"341", Suburb:"", Postcode:"", State:"Victoria", StateCode:"", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AUS", 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"}

Yandex
Melbourne VIC location is (41.926823, 2.254232)
Address of (-37.813611,144.963056) is Victoria, City of Melbourne, Elizabeth Street
Detailed address: &geo.Address{FormattedAddress:"Victoria, City of Melbourne, Elizabeth Street", Street:"Elizabeth Street", HouseNumber:"", Suburb:"", Postcode:"", State:"Victoria", StateDistrict:"", County:"", Country:"Australia", CountryCode:"AU", City:"City of Melbourne"}

FrenchAPIGouv
Champs de Mars Paris location is (2.304770, 48.854395)
Address of (48.854395,2.304770) is 9001, Parc du Champs de Mars, 75007, Paris, Paris, Île-de-France, France
Detailed address: &geo.Address{FormattedAddress:"9001, Parc du Champs de Mars, 75007, Paris, Paris, Île-de-France, France", Street:"Parc du Champs de Mars", HouseNumber:"9001", Suburb:"", Postcode:"75007", State:" Île-de-France", StateDistrict:"", County:" Paris", Country:"France", CountryCode:"FRA", City:"Paris"}

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.

Documentation

Overview

Package geo is a generic framework to develop geocode/reverse geocode clients

Index

• Constants
• Variables
• func ParseFloat(value string) float64
• type Address
• type EndpointBuilder
• type Geocoder
• type HTTPGeocoder
  • func (g HTTPGeocoder) Geocode(address string) (*Location, error)
  • func (g HTTPGeocoder) ReverseGeocode(lat, lng float64) (*Address, error)
• type Location
• type ResponseParser
• type ResponseParserFactory
• type StdLogger

Constants

const DefaultTimeout = time.Second * 8

DefaultTimeout for the request execution

Variables

var ErrTimeout = errors.New("TIMEOUT")

ErrTimeout occurs when no response returned within timeoutInSeconds

Functions

func ParseFloat

func ParseFloat(value string) float64

ParseFloat is a helper to parse a string to a float

Types

type Address

type Address struct {
	FormattedAddress string
	Street           string
	HouseNumber      string
	Suburb           string
	Postcode         string
	State            string
	StateCode        string
	StateDistrict    string
	County           string
	Country          string
	CountryCode      string
	City             string
}

Address is returned by ReverseGeocode. This is a structured representation of an address, including its flat representation

type EndpointBuilder

type EndpointBuilder interface {
	GeocodeURL(string) string
	ReverseGeocodeURL(Location) string
}

EndpointBuilder defines functions that build urls for geocode/reverse geocode

type Geocoder

type Geocoder interface {
	Geocode(address string) (*Location, error)
	ReverseGeocode(lat, lng float64) (*Address, error)
}

Geocoder can look up (lat, long) by address and address by (lat, long)

type HTTPGeocoder

type HTTPGeocoder struct {
	EndpointBuilder
	ResponseParserFactory
}

HTTPGeocoder has EndpointBuilder and ResponseParser

func (HTTPGeocoder) Geocode

func (g HTTPGeocoder) Geocode(address string) (*Location, error)

Geocode returns location for address

func (HTTPGeocoder) ReverseGeocode

func (g HTTPGeocoder) ReverseGeocode(lat, lng float64) (*Address, error)

ReverseGeocode returns address for location

type Location

type Location struct {
	Lat, Lng float64
}

Location is the output of Geocode

type ResponseParser

type ResponseParser interface {
	Location() (*Location, error)
	Address() (*Address, error)
}

ResponseParser defines functions that parse response of geocode/reverse geocode

type ResponseParserFactory

type ResponseParserFactory func() ResponseParser

ResponseParserFactory creates a new ResponseParser

type StdLogger

type StdLogger interface {
	Printf(string, ...interface{})
}

StdLogger is a interface for logging libraries.

var DebugLogger StdLogger = log.New(io.Discard, "[Geo][Debug]", log.LstdFlags)

DebugLogger is an implementation of StdLogger that geo uses to log its debug messages.

var ErrLogger StdLogger = log.New(io.Discard, "[Geo][Err]", log.LstdFlags)

ErrLogger is an implementation of StdLogger that geo uses to log its error messages.