great_circle_distance 1.0.1
Greatcircle distance
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.
By CheCheDaWaff (Own work) [CC BYSA 4.0 (https://creativecommons.org/licenses/bysa/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 Greatcircle distance
Changelog #
0.0.1 #
 Initial version for the greatcircle 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
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()}');
}
Use this package as a library
1. Depend on it
Add this to your package's pubspec.yaml file:
dependencies:
great_circle_distance: ^1.0.1
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_distance/great_circle_distance.dart';
Popularity:
Describes how popular the package is relative to other packages.
[more]

77

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

55

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

30

Overall:
Weighted score of the above.
[more]

61

We analyzed this package on Oct 21, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:
 Dart: 2.5.1
 pana: 0.12.21
Platforms
Detected platforms: Flutter, web, other
No platform restriction found in primary library
package:great_circle_distance/great_circle_distance.dart
.
Health issues and suggestions
Fix lib/src/great_circle_distance_base.dart
. (26.12 points)
Analysis of lib/src/great_circle_distance_base.dart
failed with 1 error, 3 hints:
line 61 col 68: Undefined name 'PI'.
line 1 col 8: Unused import: 'dart:math'.
line 90 col 13: DO use curly braces for all flow control structures.
line 94 col 13: DO use curly braces for all flow control structures.
Fix lib/src/formula/spherical_lawofcosines.dart
. (25 points)
Analysis of lib/src/formula/spherical_lawofcosines.dart
failed with 1 error:
line 10 col 49: Undefined name 'PI'.
Format lib/great_circle_distance.dart
.
Run dartfmt
to format lib/great_circle_distance.dart
.
Format lib/src/formula/harvesine.dart
.
Run dartfmt
to format lib/src/formula/harvesine.dart
.
Format lib/src/formula/vincenty.dart
.
Run dartfmt
to format lib/src/formula/vincenty.dart
.
Maintenance suggestions
Package is getting outdated. (69.86 points)
The package was last published 88 weeks ago.
Dependencies
Package  Constraint  Resolved  Available 

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