Calculate the greatcircle 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 greatcircle distance is the shortest distance between two points on the surface of a sphere
A diagram illustrating greatcircle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v, are also depicted. <br><br> By CheCheDaWaff (Own work) [CC BYSA 4.0 (https://creativecommons.org/licenses/bysa/4.0)], via Wikimedia Commons
Included in this library:
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 Greatcircle distance
Added coordinates validation. A coordinate is considered invalid if it meets at least one of the following criteria:
see Decimal degrees
Remove upper bound Dart SDK constraint
thanks to @bramvbilsen for pointing it out and for the PR
example/great_circle_distance_example.dart
import 'package:great_circle_distance/great_circle_distance.dart';
main() {
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()}');
}
Add this to your package's pubspec.yaml file:
dependencies:
great_circle_distance: "^1.0.1"
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.
Now in your Dart code, you can use:
import 'package:great_circle_distance/great_circle_distance.dart';
Version  Uploaded  Documentation  Archive 

1.0.1  Feb 8, 2018  
1.0.0  Oct 12, 2017  
0.0.6  Oct 7, 2017  
0.0.5  Oct 7, 2017  
0.0.4  Oct 7, 2017  
0.0.3  Oct 1, 2017  
0.0.2  Oct 1, 2017  
0.0.1  Oct 1, 2017 
We analyzed this package on Jun 12, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:
Popularity:
Describes how popular the package is relative to other packages.
[more]

73  / 100 
Health:
Code health derived from static analysis.
[more]

95  / 100 
Maintenance:
Reflects how tidy and uptodate the package is.
[more]

100  / 100 
Overall score:
Weighted score of the above.
[more]

85 
Detected platforms: Flutter, web, other
No platform restriction found in primary library
package:great_circle_distance/great_circle_distance.dart
.
Fix analysis and formatting issues.
Analysis or formatting checks reported 8 hints.
Run
dartfmt
to formatlib/great_circle_distance.dart
.Run
dartfmt
to formatlib/src/formula/harvesine.dart
.Similar analysis of the following files failed:
lib/src/formula/spherical_lawofcosines.dart
(hint)lib/src/formula/vincenty.dart
(hint)lib/src/great_circle_distance_base.dart
(hint)
Package  Constraint  Resolved  Available 

Direct dependencies  
Dart SDK  >=1.20.1 <3.0.0  
Dev dependencies  
test  ^0.12.0 