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Stable

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4.9

Declining

Stars 47

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Forks 9

Last Commit 3 months ago

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

UTM alternatives and similar packages

Based on the "GIS" category.
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orb

7.3 4.3 UTM VS orb

Types and utilities for working with 2d geometry in Golang
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7.2 5.9 UTM VS go-geom

Package geom implements efficient geometry types for geospatial applications.

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polyline

4.5 3.9 UTM VS polyline

Package polyline implements a Google Maps Encoding Polyline encoder and decoder.
WGS84

4.4 5.5 UTM VS WGS84

A zero-dependency Go package for coordinate transformations.
go-kml

3.9 6.2 UTM VS go-kml

Package kml provides convenience methods for creating and writing KML documents.
go-gpx

2.6 6.6 UTM VS go-gpx

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go-sypexgeo

2.3 1.8 UTM VS go-sypexgeo

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1.9 0.0 UTM VS doarama.go

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README

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))

}