Geodesy

A Dart library for implementing geodesic and trigonometric calculations based on a spherical Earth model for working with points and paths such as distances, bearings and destinations

Getting Started

Add the following line in your pubspec file

geodesy:

Include the widget in your dart file

import 'package:geodesy/geodesy.dart';

Usage

Geodesy()

Geodesy geodesy = Geodesy();

LatLng(double latitude, double longitude)

LatLng l = LatLng(22.308, 114.1716);

Methods

destinationPointByDistanceAndBearing(LatLng l, num distance, num bearing, [num radius])

Calculate a destination point given the distance and bearing. If raduis is not specified, Earth radius will be used.

LatLng distinationPoint = geodesy.destinationPointByDistanceAndBearing(l3, 2400, 420.2);

midPointBetweenTwoGeoPoints(LatLng l1, LatLng l2)

Calcuate the midpoint bewteen teo geo points.

LatLng midpoint = geodesy.midPointBetweenTwoGeoPoints(l1, l2);

distanceBetweenTwoGeoPoints(LatLng l1, LatLng l2, [num radius])

Calculate the distance in meters between two geo points. If raduis is not specified, Earth radius will be used.

num distance = geodesy.distanceBetweenTwoGeoPoints(l1, l2);

bearingBetweenTwoGeoPoints(LatLng l1, LatLng l2)

Calculate the bearing from point l1 to point l2.

num finalBearing = geodesy.finalBearingBetweenTwoGeoPoints(l1, l2);

finalBearingBetweenTwoGeoPoints(LatLng l1, LatLng l2)

Calculate the final bearing from point l1 to point l2.

num finalBearing = geodesy.finalBearingBetweenTwoGeoPoints(l1, l2);

degreesToRadians(num degrees)

Convert degrees to radians

num l1LatRadians = degreesToRadians(l1.lat);

radiansToDegrees(num radians)

Convert degrees to radians

num degrees = radiansToDegrees(latRadians);

isGeoPointInBoudingBox(LatLng l, LatLng topLeft, LatLng bottomRight)

Check if a given geo point is in the bouding box

bool inBoudingBox = geodesy.isGeoPointInBoudingBox(l1, l2, l3);

intersectionByPaths(LatLng l1, LatLng l2, num b1, num b2)

Calculate the geo point of intersection of two given paths

LatLng intersectionByPaths = geodesy.intersectionByPaths(l1, l2, b1, b2);

crossTrackDistanceTo(LatLng l1, LatLng start, LatLng end, [num radius])

Calculate signed distance from a geo point to greate circle with start and end points

num distanceToGreatCircle = geodesy.crossTrackDistanceTo(l1, l2, l3);

isGeoPointInPolygon(LatLng l, List polygon)

Check if a given geo point is in the a polygon using even-odd rule algorithm

bool isGeoPointInPolygon = geodesy.isGeoPointInPolygon(l, poly);

pointsInRange(LatLng point, List pointsToCheck, num distance)

Get a list of points within a distance in meters from a given point

final point = LatLng(51.0, 0);
final pointsToCheck = <LatLng>[/* points here */];
final distance = 10000;
List<LatLng> geofencedPoints = geodesy.pointsInRange(point, pointsToCheck, distance);

akandratovich / geodesy