latlong library

Helps with latitude / longitude calculations.

For distance calculations the default algorithm Vincenty is used. Vincenty is a bit slower than Haversine but fare more accurate!

 final Distance distance = new Distance();

 // km = 423
 final int km = distance.as(LengthUnit.Kilometer,
    new LatLng(52.518611,13.408056),new LatLng(51.519475,7.46694444));

 // meter = 422592
 final int meter = distance(new LatLng(52.518611,13.408056),new LatLng(51.519475,7.46694444));

Find more infos on Movable Type Scripts and Movable Type Scripts - Vincenty

LatLong

Map

Classes

Circle
Circle-base GEO algorithms. [...]
Distance
Calculates the distance between points. [...]
DistanceCalculator
DistanceHaversine
Shortcut for final Distance distance = const Distance(calculator: const Haversine());
DistanceVincenty
Shortcut for final Distance distance = const Distance(calculator: const Vincenty());
Haversine
LatLng
Coordinates in Degrees [...]
LengthUnit
Path<T extends LatLng>
Path of LatLng values [...]
Vincenty

Constants

EARTH_RADIUS → const double
Earth radius in meter
EQUATOR_RADIUS
EQUATOR_RADIUS → const double
Equator radius in meter (WGS84 ellipsoid)
6378137.0
FLATTENING → const double
WGS84
1 / 298.257223563
PI → const double
The PI constant.
math.pi
POLAR_RADIUS → const double
Polar radius in meter (WGS84 ellipsoid)
6356752.314245

Functions

decimal2sexagesimal(double dec) String
Converts a decimal coordinate value to sexagesimal format [...]
degToRadian(double deg) double
Converts degree to radian
normalizeBearing(double bearing) double
Convert a bearing to be within the 0 to +360 degrees range. Compass bearing is in the rangen 0° ... 360°
radianToDeg(double rad) double
Radian to degree
round(double value, {int decimals = 6}) double
Rounds value to given number of decimals

Typedefs

LatLngFactory = LatLng Function(double latitude, double longitude)
Necessary for creating new instances T extends LatLng (Path [...]