great_circle_distance2 1.0.1+1

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  • Changelog
  • Installing
  • 88

Great-circle distance Pub Travis status Coverage Status #

Calculate the great-circle distance between two points (having Latitude,Longitude) on the surface of Earth You can get the distance using the Spherical law of cosines, Haversine formula or Vincenty`s formula

The great-circle distance is the shortest distance between two points on the surface of a sphere

Great-circle distance (drawn in red) between two points on a sphere

A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v, are also depicted.

By CheCheDaWaff (Own work) [CC BY-SA 4.0 (], via Wikimedia Commons

Included in this library:

  • Spherical law of cosines
  • Haversine formula
  • Vincenty` formula (por from the Android implementation)

Disclaimer: The earth is not quite a sphere. This means that errors(0.3%,0.5% errors) from assuming spherical geometry might be considerable depending on the points; so: don't trust your life on this value

Usage example:

final lat1 = 41.139129;
final lon1 = 1.402244;

final lat2 = 41.139074;
final lon2 = 1.402315;

var gcd = new GreatCircleDistance.fromDegrees(latitude1: lat1, longitude1: lon1, latitude2: lat2, longitude2: lon2);

print('Distance from location 1 to 2 using the Haversine formula is: ${gcd.haversineDistance()}');
print('Distance from location 1 to 2 using the Spherical Law of Cosines is: ${gcd.sphericalLawOfCosinesDistance()}');
print('Distance from location 1 to 2 using the Vicenty`s formula is: ${gcd.vincentyDistance()}');

Check Wikipedia for detailed description on Great-circle distance

Changelog #

0.0.1 #

  • Initial version for the great-circle distance (Spherical law of cosines, Haversine formula and Vincenty` formula)

0.0.2 #

  • Minor update to sample code

0.0.3 #

  • Add an usage example the the README

0.0.5 #

  • Update descriptions

0.0.6 #

  • Minor test update, added travis integration

1.0.0 #

Added coordinates validation. A coordinate is considered invalid if it meets at least one of the following criteria:

  • Its latitude is greater than 90 degrees or less than -90 degrees.
  • Its longitude is greater than 180 degrees or less than -180 degrees.

see Decimal degrees

1.0.1 #

Remove upper bound Dart SDK constraint

thanks to @bramvbilsen for pointing it out and for the PR

Use this package as a library

1. Depend on it

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

  great_circle_distance2: ^1.0.1+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:great_circle_distance2/great_circle_distance2.dart';
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Learn more about scoring.

We analyzed this package on Jun 5, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.8.2
  • pana: 0.13.8-dev

Health suggestions

Fix lib/src/great_circle_distance_base.dart. (-1.99 points)

Analysis of lib/src/great_circle_distance_base.dart reported 4 hints:

line 91 col 7: DO use curly braces for all flow control structures.

line 91 col 13: Unnecessary new keyword.

line 95 col 7: DO use curly braces for all flow control structures.

line 95 col 13: Unnecessary new keyword.

Format lib/src/formula/harvesine.dart.

Run dartfmt to format lib/src/formula/harvesine.dart.

Format lib/src/formula/spherical_lawofcosines.dart.

Run dartfmt to format lib/src/formula/spherical_lawofcosines.dart.

Format lib/src/formula/vincenty.dart.

Run dartfmt to format lib/src/formula/vincenty.dart.

Maintenance suggestions

Maintain an example.

None of the files in the package's example/ directory matches known example patterns.

Common filename patterns include main.dart, example.dart, and great_circle_distance2.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
Dev dependencies
test ^1.6.5