Locations

Sorting of locations ref. nearest location.

Sort locations with nearest distance

How it works?

  • Get user’s current location
  • Compare with other destinations
  • Sort according the nearest

There are two ways to compare distance

Personally, I like Haversine Formula and have been using it.

Algorithm 1

Use Havesine Formula.

Haversine Formula

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);
}

Algorithm 2

Use inbuilt distance comparision function provided by Geolocater.

Geolocator.distanceBetween(source.latitude,source.longitude, destination.latitude,destination.longitude);

Assumption"

  • You are in Google Plex (37.422,-122.084)

Destinations:

  • Destination(37.4274684,-122.1698161, "Standford University"),
  • Destination(37.4083327,-122.0776016, "Taco Bell"),
  • Destination(37.4259071,-122.1095606, "Ramos Park"),
  • Destination(37.8711583,-122.336457, "Bekerly"),
  • Destination(37.7586968,-122.3053474, "Oakland"),
  • Destination(37.4420794,-122.1432758, "Palo Alto"),
  • Destination(37.5206515,-122.064364, "New wark")

Output:

Haversine AlgorithmGeolocator Algorithm
ic_havesineic_geo

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