UTM

Bidirectional UTM-WGS84 converter for golang. It use logic from UTM python version by Tobias Bieniek

Usage

go get github.com/im7mortal/UTM

Convert a latitude, longitude into an UTM coordinate

    easting, northing, zoneNumber, zoneLetter, err := UTM.FromLatLon(40.71435, -74.00597, false)

Convert an UTM coordinate into a latitude, longitude.

    latitude, longitude, err := UTM.ToLatLon(377486, 6296562, 30, "V")

Since the zone letter is not strictly needed for the conversion you may also the northern parameter instead, which is a named parameter and can be set to either true or false. In this case you should define fields clearly(!). You can't set ZoneLetter or northern both.

    latitude, longitude, err := UTM.ToLatLon(377486, 6296562, 30, "", false)

The UTM coordinate system is explained on this Wikipedia page

Speed

Benchmark	Amount of iterations	Average speed
ToLatLon	10000000	123 ns/op
ToLatLonWithNorthern	10000000	121 ns/op
FromLatLon	20000000	80.6 ns/op

go test -bench=.

Full example

package main

import (
	"github.com/im7mortal/UTM"
	"fmt"
)

func main() {

	easting, northing, zoneNumber, zoneLetter, err := UTM.FromLatLon(40.71435, -74.00597, false)
	if err != nil {
		panic(err.Error())
	}
	fmt.Println(
		fmt.Sprintf(
			"Easting: %d; Northing: %d; ZoneNumber: %d; ZoneLetter: %s;",
			easting,
			northing,
			zoneNumber,
			zoneLetter,
		))

	easting, northing, zoneNumber, zoneLetter, err = UTM.FromLatLon(40.71435, -74.00597, true)
	if err != nil {
		panic(err.Error())
	}
	fmt.Println(
		fmt.Sprintf(
			"Easting: %d; Northing: %d; ZoneNumber: %d; ZoneLetter: %s;",
			easting,
			northing,
			zoneNumber,
			zoneLetter,
		))

	latitude, longitude, err := UTM.ToLatLon(377486, 6296562, 30, "", true)
	fmt.Println(fmt.Sprintf("Latitude: %.5f; Longitude: %.5f;", latitude, longitude))

	latitude, longitude, err = UTM.ToLatLon(377486, 6296562, 30, "V")
	fmt.Println(fmt.Sprintf("Latitude: %.5f; Longitude: %.5f;", latitude, longitude))

}

Authors

• Petr Lozhkin [email protected]