Get the distance between two geo points

Question

I want to make an app which checks the nearest place where a user is  I can easily get the location of the user and I have already a list of places with latitude and longitude   What would be the best way to know the nearest place of the list against the current user location    I could not find anything in the google APIs

User · Answer

a   sin    f 2    cos f1    cos f2    sin      2   c   2    atan2  va   v 1-a    distance   R    c   where f is latitude    is longitude  R is earth   s radius  mean radius   6 371km   note that angles need to be in radians to pass to trig functions   fun distanceInMeter firstLocation  Location  secondLocation  Location   Double       val earthRadius   6371000 0     val deltaLatitudeDegree    firstLocation latitude - secondLocation latitude    Math PI   180f     val deltaLongitudeDegree    firstLocation longitude - secondLocation longitude    Math PI   180f     val a   sin deltaLatitudeDegree   2  pow 2                cos firstLocation latitude   Math PI   180f    cos secondLocation latitude   Math PI   180f                sin deltaLongitudeDegree   2  pow 2      val c   2f   atan2 sqrt a   sqrt 1 - a       return earthRadius   c     data class Location val latitude  Double  val longitude  Double

User · Answer

There are two ways to get distance between LatLng   public static void distanceBetween  double startLatitude  double startLongitude  double endLatitude  double endLongitude  float   results    See this  and second  public float distanceTo  Location dest  as answered by praveen

User · Answer

Just use the following method  pass it lat and long and get distance in meter   private static double distance in meter final double lat1  final double lon1  final double lat2  final double lon2        double R   6371000f     Radius of the earth in m     double dLat    lat1 - lat2    Math PI   180f      double dLon    lon1 - lon2    Math PI   180f      double a   Math sin dLat 2    Math sin dLat 2                Math cos latlong1 latitude   Math PI   180f    Math cos latlong2 latitude   Math PI   180f                        Math sin dLon 2    Math sin dLon 2       double c   2f   Math atan2 Math sqrt a   Math sqrt 1-a        double d   R   c      return d

User · Answer

you can get distance and time using google Map API Google Map API  just pass downloaded JSON to this method you will get real time Distance and Time between two latlong s   void parseJSONForDurationAndKMS String json  throws JSONException        Log d TAG   called parseJSONForDurationAndKMS        JSONObject jsonObject   new JSONObject json       String distance      String duration      distance   jsonObject getJSONArray  routes   getJSONObject 0  getJSONArray  legs   getJSONObject 0  getJSONObject  distance   getString  text        duration   jsonObject getJSONArray  routes   getJSONObject 0  getJSONArray  legs   getJSONObject 0  getJSONObject  duration   getString  text         Log d TAG   distance       distance       Log d TAG   duration       duration        distanceBWLats setText  Distance       distance     n     Duration       duration

User · Answer

Location loc1   new Location      loc1 setLatitude lat1   loc1 setLongitude lon1    Location loc2   new Location      loc2 setLatitude lat2   loc2 setLongitude lon2    float distanceInMeters   loc1 distanceTo loc2     Reference  http   developer android com reference android location Location html distanceTo android location Location

User · Answer

An approximated solution  based on an equirectangular projection   much faster  it requires only 1 trig and 1 square root    This approximation is relevant if your points are not too far apart  It will always over-estimate compared to the real haversine distance  For example it will add no more than 0 05382   to the real distance if the delta latitude or longitude between your two points does not exceed 4 decimal degrees   The standard formula  Haversine  is the exact one  that is  it works for any couple of longitude latitude on earth  but is much slower as it needs 7 trigonometric and 2 square roots  If your couple of points are not too far apart  and absolute precision is not paramount  you can use this approximate version  Equirectangular   which is much faster as it uses only one trigonometric and one square root      Approximate Equirectangular -- works if  lat1 lon1     lat2 lon2  int R   6371     km double x    lon2 - lon1    Math cos  lat1   lat2    2   double y    lat2 - lat1   double distance   Math sqrt x   x   y   y    R    You can optimize this further by either    Removing the square root if you simply compare the distance to another  in that case compare both squared distance   Factoring-out the cosine if you compute the distance from one master point to many others  in that case you do the equirectangular projection centered on the master point  so you can compute the cosine once for all comparisons     For more info see  http   www movable-type co uk scripts latlong html  There is a nice reference implementation of the Haversine formula in several languages at  http   www codecodex com wiki Calculate Distance Between Two Points on a Globe

User · Answer

private float getDistance double lat1  double lon1  double lat2  double lon2            float   distance   new float 2           Location distanceBetween lat1  lon1  lat2  lon2  distance           return distance 0

User · Answer

http   developer android com reference android location Location html  Look into distanceTo or distanceBetween   You can create a Location object from a latitude and longitude   Location location   new Location      location setLatitude lat   location setLongitude lon

User · Answer

There are a couple of methods you could use  but to determine which one is best we first need to know if you are aware of the user s altitude  as well as the altitude of the other points   Depending on the level of accuracy you are after  you could look into either the Haversine or Vincenty formulae     These pages detail the formulae  and  for the less mathematically inclined also provide an explanation of how to implement them in script   Haversine Formula  http   www movable-type co uk scripts latlong html  Vincenty Formula  http   www movable-type co uk scripts latlong-vincenty html  If you have any problems with any of the meanings in the formulae  just comment and I ll do my best to answer them

[android] Get the distance between two geo points

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