latlong 0.6.1

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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 #

Distance #

    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)

Offset #

    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.

License #

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

Unreleased #

Refactor #

v0.5 - 2018-06-06

Refactor #

v0.3.4 - 2016-11-16

Docs #

v0.3.3 - 2016-04-18

Docs #

v0.3.2 - 2016-02-04

Feature #

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

v0.3.1 - 2016-02-03

Feature #

v0.3.0 - 2016-01-29

Feature #

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

Docs #

v0.2.0 - 2016-01-26

Feature #

  • Circle#isInside Polygon#center cce0a4d

v0.1.1 - 2016-01-25

Docs #

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 pub get

Alternatively, your editor might support pub get or flutter pub 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';
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Code health derived from static analysis. [more]
Reflects how tidy and up-to-date the package is. [more]
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Learn more about scoring.

We analyzed this package on Jan 20, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.0
  • pana: 0.13.4

Health suggestions

Fix lib/latlong/Path.dart. (-7.71 points)

Analysis of lib/latlong/Path.dart reported 16 hints, including:

line 33 col 8: Unnecessary new keyword.

line 46 col 28: Unnecessary new keyword.

line 56 col 39: Use = to separate a named parameter from its default value.

line 57 col 26: Unnecessary new keyword.

line 59 col 75: Use = to separate a named parameter from its default value.

Fix lib/latlong/Distance.dart. (-3.93 points)

Analysis of lib/latlong/Distance.dart reported 8 hints, including:

line 42 col 44: Use = to separate a named parameter from its default value.

line 42 col 87: Use = to separate a named parameter from its default value.

line 46 col 33: Use = to separate a named parameter from its default value.

line 46 col 76: Use = to separate a named parameter from its default value.

line 132 col 52: Use = to separate a named parameter from its default value.

Fix lib/latlong/LatLng.dart. (-3.45 points)

Analysis of lib/latlong/LatLng.dart reported 7 hints, including:

line 37 col 5: Avoid return types on setters.

line 43 col 5: Avoid return types on setters.

line 53 col 45: Unnecessary new keyword.

line 54 col 22: Unnecessary new keyword.

line 74 col 38: Use = to separate a named parameter from its default value.

Fix additional 8 files with analysis or formatting issues. (-8.45 points)

Additional issues in the following files:

  • lib/latlong/LengthUnit.dart (5 hints)
  • lib/latlong/Circle.dart (3 hints)
  • lib/latlong/calculator/Vincenty.dart (3 hints)
  • lib/spline/CatmullRomSpline.dart (3 hints)
  • lib/latlong.dart (2 hints)
  • lib/latlong/calculator/Haversine.dart (1 hint)
  • lib/latlong/interfaces.dart (Run dartfmt to format lib/latlong/interfaces.dart.)
  • lib/spline.dart (Run dartfmt to format lib/spline.dart.)

Maintenance suggestions

Package is getting outdated. (-39.18 points)

The package was last published 72 weeks ago.

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and latlong.dart. Packages with multiple examples should provide example/

For more information see the pub package layout conventions.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0 <3.0.0
console_log_handler >=1.1.0 <2.0.0 1.1.6
intl >=0.15.0 <1.0.0 0.16.1
logging >=0.11.3 <1.0.0 0.11.4
validate ^1.0.0 1.7.0
Transitive dependencies
ansicolor 1.0.2
path 1.6.4
Dev dependencies
build_runner any
build_test any
build_web_compilers any
test any