latlong 0.6.1

  • Installing
  • Versions
  • 94

LatLong provides a lightweight library for common latitude and longitude calculation.

This library supports both, the "Haversine" and the "Vincenty" algorithm.

"Haversine" is a bit faster but "Vincenty" is far more accurate!


Catmull-Rom algorithm is used for smoothing out the path.

Basic usage


    final Distance distance = new Distance();
    // km = 423
    final int km =,
     new LatLng(52.518611,13.408056),new LatLng(51.519475,7.46694444));
    // meter = 422591.551
    final int meter = distance(
        new LatLng(52.518611,13.408056),
        new LatLng(51.519475,7.46694444)


    final Distance distance = const Distance();
    final num distanceInMeter = (EARTH_RADIUS * math.PI / 4).round();
    final p1 = new LatLng(0.0, 0.0);
    final p2 = distance.offset(p1, distanceInMeter, 180);
    // LatLng(latitude:-45.219848, longitude:0.0)
    // 45° 13' 11.45" S, 0° 0' 0.00" O

Path smoothing

    // zigzag is a list of coordinates
    final Path path = new Path.from(zigzag);
    // Result is below
    final Path steps = path.equalize(8,smoothPath: true);

Smooth path

Features and bugs

Please file feature requests and bugs at the issue tracker.


Copyright 2015 Michael Mitterer (,
IT-Consulting and Development Limited, Austrian Branch

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
either express or implied. See the License for the specific language
governing permissions and limitations under the License.

If this plugin is helpful for you - please (Circle) me or star this repo here on GitHub

Change Log for latlong

Lightweight library for common latitude and longitude calculation



v0.5 - 2018-06-06


v0.3.4 - 2016-11-16


v0.3.3 - 2016-04-18


v0.3.2 - 2016-02-04


  • Path.equalize excepts now a num instead of int 108431b

v0.3.1 - 2016-02-03


v0.3.0 - 2016-01-29


  • CatmullRom added for Path-Finding ebeeb2c
  • Algorithms got their own class f8a661f


v0.2.0 - 2016-01-26


  • Circle#isInside Polygon#center cce0a4d

v0.1.1 - 2016-01-25


This was generated with Changelog for Dart

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  latlong: ^0.6.1

2. Install it

You can install packages from the command line:

with pub:

$ pub get

with Flutter:

$ flutter packages get

Alternatively, your editor might support pub get or flutter packages get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:latlong/latlong.dart';
Version Uploaded Documentation Archive
0.6.1 Aug 29, 2018 Go to the documentation of latlong 0.6.1 Download latlong 0.6.1 archive
0.5.3 Jun 6, 2018 Go to the documentation of latlong 0.5.3 Download latlong 0.5.3 archive
0.4.5 Dec 13, 2017 Go to the documentation of latlong 0.4.5 Download latlong 0.4.5 archive
0.4.3 Dec 13, 2017 Go to the documentation of latlong 0.4.3 Download latlong 0.4.3 archive
0.4.1 Dec 13, 2017 Go to the documentation of latlong 0.4.1 Download latlong 0.4.1 archive
0.3.4 Nov 16, 2016 Go to the documentation of latlong 0.3.4 Download latlong 0.3.4 archive
0.3.3 Oct 13, 2016 Go to the documentation of latlong 0.3.3 Download latlong 0.3.3 archive
0.3.2 Feb 4, 2016 Go to the documentation of latlong 0.3.2 Download latlong 0.3.2 archive
0.3.1 Feb 3, 2016 Go to the documentation of latlong 0.3.1 Download latlong 0.3.1 archive
0.3.0 Jan 29, 2016 Go to the documentation of latlong 0.3.0 Download latlong 0.3.0 archive

All 15 versions...

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Learn more about scoring.

We analyzed this package on Nov 14, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.0.0
  • pana: 0.12.6


Detected platforms: Flutter, web, other

No platform restriction found in primary library package:latlong/latlong.dart.

Health suggestions

Format lib/latlong.dart.

Run dartfmt to format lib/latlong.dart.

Format lib/latlong/Circle.dart.

Run dartfmt to format lib/latlong/Circle.dart.

Format lib/latlong/Distance.dart.

Run dartfmt to format lib/latlong/Distance.dart.

Fix additional 8 files with analysis or formatting issues.

Additional issues in the following files:

  • lib/latlong/LatLng.dart (Run dartfmt to format lib/latlong/LatLng.dart.)
  • lib/latlong/LengthUnit.dart (Run dartfmt to format lib/latlong/LengthUnit.dart.)
  • lib/latlong/Path.dart (Run dartfmt to format lib/latlong/Path.dart.)
  • lib/latlong/calculator/Haversine.dart (Run dartfmt to format lib/latlong/calculator/Haversine.dart.)
  • lib/latlong/calculator/Vincenty.dart (Run dartfmt to format lib/latlong/calculator/Vincenty.dart.)
  • lib/latlong/interfaces.dart (Run dartfmt to format lib/latlong/interfaces.dart.)
  • lib/spline.dart (Run dartfmt to format lib/spline.dart.)
  • lib/spline/CatmullRomSpline.dart (Run dartfmt to format lib/spline/CatmullRomSpline.dart.)

Maintenance suggestions

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package. Common file name patterns include: main.dart, example.dart or you could also use latlong.dart.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0 <3.0.0
console_log_handler >=1.1.0 <2.0.0 1.1.3
intl >=0.15.0 <1.0.0 0.15.7
logging >=0.11.3 <1.0.0 0.11.3+2
validate ^1.0.0 1.7.0
Transitive dependencies
ansicolor 1.0.2
path 1.6.2
Dev dependencies
build_runner any
build_test any
build_web_compilers any
test any