Geolocation and Maps in Go (Golang) | Libraries

Geolocation and Maps in Go (Golang): Library Overview and Code Examples

Go (Golang) is a modern compiled language that is gaining popularity in backend development due to its performance, simplicity, and built-in concurrency support. When creating educational, logistics, tourism, and other web services, it is often necessary to work with geographic data: calculating distances between points, checking if coordinates fall within zones, building routes, and displaying maps. In this article, we will review the main Go libraries for working with geolocation and maps, and provide practical code examples.

Main Libraries for Working with Geolocation

1. `github.com/paulmach/orb` — Universal Library for Working with Geometric Objects

The orb library provides types and functions for working with points, lines, polygons, and other geometric primitives. It supports GeoJSON, boolean geometry operations, projections, and coordinate transformations. This is a foundational library upon which many other solutions are built.

package main

import (    "fmt"    "github.com/paulmach/orb"    "github.com/paulmach/orb/geo")

func main() {    // Define two points (latitude, longitude)    moscow := orb.Point{37.6173, 55.7558}    spb := orb.Point{30.3351, 60.0000}

    // Calculate distance in kilometers (haversine formula)    distance := geo.Distance(moscow, spb)    fmt.Printf("Distance from Moscow to Saint Petersburg: %.2f km", distance)}

2. `github.com/twpayne/go-geom` — Powerful Library for Geometric Operations

This library offers lower-level access to geometry and supports many OGC (Open Geospatial Consortium) standards. It is ideal for complex calculations: polygon intersections, buffering, projection transformations.

import (    "github.com/twpayne/go-geom"    "github.com/twpayne/go-geom/encoding/geojson")

// Example: creating a point and serializing to GeoJSONpoint := geom.NewPoint(geom.XY).SetCoords(geom.Coord{37.6173, 55.7558})data, _ := geojson.Marshal(point)fmt.Println(string(data))// Output: {"type":"Point","coordinates":[37.6173,55.7558]}

3. `github.com/kellydunn/golang-geo` — Simple Library for Distance Calculation and Geocoding

The golang-geo library provides a simple API for working with points, calculating distances (in miles and kilometers), and geocoding via the Google Maps API or OpenStreetMap (Nominatim).

import "github.com/kellydunn/golang-geo"

func main() {    p1 := geo.NewPoint(55.7558, 37.6173)    p2 := geo.NewPoint(60.0000, 30.3351)    dist := p1.GreatCircleDistance(p2) // in kilometers    fmt.Printf("Distance: %.2f km", dist)}

Libraries for Working with Maps and Visualization

4. `github.com/umahmood/leaflet-go` — Integration with Leaflet.js for Go

Leaflet is one of the most popular JavaScript libraries for interactive maps. leaflet-go allows you to generate HTML code with maps directly from a Go application. This is convenient for educational sites and simple web services.

import "github.com/umahmood/leaflet-go"

func main() {    // Create a map centered on Moscow    m := leaflet.NewMap(        leaflet.Center(55.7558, 37.6173),        leaflet.Zoom(10),        leaflet.TileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"),    )

    // Add a marker    m.AddMarker(leaflet.Marker(        leaflet.LatLng(55.7558, 37.6173),        leaflet.Popup("Moscow, Kremlin"),    ))

    // Output the map HTML code    html, _ := m.Render()    fmt.Println(html)}