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Description

Bidirectional UTM-WGS84 converter for golang. It's port from UTM python version by Tobias Bieniek

Programming language: Go
License: GNU General Public License v3.0 only
Tags: GIS     Geospatial     Coordinates     Latitude     Longitude    
Latest version: v1.2.2

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README

Build Status Coverage Status GoDoc

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