Measure distance between two locations

Question

Is there any way to fetch the distance between two locations in Flutter?

https://stackoverflow.com/questions/54138750/total-distance-calculation-from-latlng-list — Roger Gusmao, Oct 12 '20 at 17:48

score 5 · Answer 1 · answered Dec 21 '19 at 10:42

You can find the distance by the HaverSine formula, implemented in dart as:

import'dart:math' as Math;
void main()=>print(getDistanceFromLatLonInKm(73.4545,73.4545,83.5454,83.5454));



double getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) {
  var R = 6371; // Radius of the earth in km
  var dLat = deg2rad(lat2-lat1);  // deg2rad below
  var dLon = deg2rad(lon2-lon1); 
  var a = 
    Math.sin(dLat/2) * Math.sin(dLat/2) +
    Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * 
    Math.sin(dLon/2) * Math.sin(dLon/2)
    ; 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  var d = R * c; // Distance in km
  return d;
}

double deg2rad(deg) {
  return deg * (Math.pi/180);
}

Output:

1139.9231530436646

Source in Javscript and credits to Chuck.

@Jessica Take R to be 6371000 for meters. – cmd_prompter Dec 28 '20 at 12:28 — cmd_prompter, Dec 28 '20 at 12:28

score 1 · Answer 2 · answered Dec 21 '19 at 10:22

1

You can use geolocator plugin if you are looking for the shortest distance between two locations aka LatLng.

double distanceInMeters = 
  await Geolocator().distanceBetween(52.2165157, 6.9437819, 52.3546274, 4.8285838);

answered Dec 21 '19 at 10:22

CopsOnRoad

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I alerady used this package but now I used this package flutter_background_geolocation I want to know is there is any methods do this job due to I wont use 1 package instead 2 – Mahmoud Niypoo Dec 21 '19 at 10:33
Sorry there is no way of doing it using `flutter_background_geolocation` plugin. – CopsOnRoad Dec 21 '19 at 14:21

score 1 · Answer 3 · answered Dec 11 '20 at 12:23

I've used the vector_math for converting degree to radians and also the geolocator for getting the current user latitude and longitude if in case searching from the current location also there is a method where in you can calculate the distance between two locations directly as Geolocator.distanceBetween(startLatitude, startLongitude, endLatitude, endLongitude).

import 'dart:math' show sin, cos, sqrt, atan2;
import 'package:vector_math/vector_math.dart';
import 'package:geolocator/geolocator.dart';

Position _currentPosition;
double earthRadius = 6371000; 

//Using pLat and pLng as dummy location
double pLat = 22.8965265;   double pLng = 76.2545445; 


//Use Geolocator to find the current location(latitude & longitude)
getUserLocation() async {
   _currentPosition = await GeoLocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
}

//Calculating the distance between two points without Geolocator plugin
getDistance(){
   var dLat = radians(pLat - _currentPosition.latitude);
   var dLng = radians(pLng - _currentPosition.longitude);
   var a = sin(dLat/2) * sin(dLat/2) + cos(radians(_currentPosition.latitude)) 
           * cos(radians(pLat)) * sin(dLng/2) * sin(dLng/2);
   var c = 2 * atan2(sqrt(a), sqrt(1-a));
   var d = earthRadius * c;
   print(d); //d is the distance in meters
}

//Calculating the distance between two points with Geolocator plugin
getDistance(){
   final double distance = Geolocator.distanceBetween(pLat, pLng, 
           _currentPosition.latitude, _currentPosition.longitude); 
   print(distance); //distance in meters
}

Measure distance between two locations

3 Answers3