Calculate distance between two points in google maps V3

Question

How do you calculate the distance between two markers in Google maps V3   Similar to the distanceFrom function inV2    Thanks

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Had to do it    The action script way    just make sure you pass a number to the function because it would accept you mother in law    public var rad   function x     return x Math PI 180    protected  function distHaversine p1 Object  p2 Object  Number       var R int   6371     earth s mean radius in km     var dLat Number   rad p2 lat   - p1 lat         var dLong Number   rad p2 lng   - p1 lng          var a Number   Math sin dLat 2    Math sin dLat 2                    Math cos rad p1 lat       Math cos rad p2 lat       Math sin dLong 2    Math sin dLong 2       var c Number   2   Math atan2 Math sqrt a   Math sqrt 1-a        var d Number   R   c       return d

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If you want to calculate it yourself  then you can use the Haversine formula   var rad   function x      return x   Math PI   180      var getDistance   function p1  p2      var R   6378137     Earth   s mean radius in meter   var dLat   rad p2 lat   - p1 lat       var dLong   rad p2 lng   - p1 lng       var a   Math sin dLat   2    Math sin dLat   2        Math cos rad p1 lat       Math cos rad p2 lat           Math sin dLong   2    Math sin dLong   2     var c   2   Math atan2 Math sqrt a   Math sqrt 1 - a      var d   R   c    return d     returns the distance in meter

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It s Quite easy using Google Distance Matrix service  First step is to activate Distance Matrix service from google API console  it returns distances between a set of locations  And apply this simple function  function initMap             var bounds   new google maps LatLngBounds          var markersArray                var origin1    lat 23 0203  lng  72 5562             var origin2    Ahmedabad  India           var destinationA    lat 23 0436503  lng  72 55008939999993             var destinationB    lat  23 2156  lng  72 6369            var destinationIcon    https   chart googleapis com chart                  chst d map pin letter amp chld D FF0000 000000           var originIcon    https   chart googleapis com chart                  chst d map pin letter amp chld O FFFF00 000000           var map   new google maps Map document getElementById  map                center   lat  55 53  lng  9 4             zoom  10                     var geocoder   new google maps Geocoder           var service   new google maps DistanceMatrixService          service getDistanceMatrix             origins   origin1             destinations   destinationA             travelMode   DRIVING             unitSystem  google maps UnitSystem METRIC            avoidHighways  false            avoidTolls  false            function response  status              if  status      OK                 alert  Error was      status               else               var originList   response originAddresses              var destinationList   response destinationAddresses              var outputDiv   document getElementById  output                outputDiv innerHTML                   deleteMarkers markersArray                var showGeocodedAddressOnMap   function asDestination                  var icon   asDestination   destinationIcon   originIcon                return function results  status                    if  status      OK                       map fitBounds bounds extend results 0  geometry location                      markersArray push new google maps Marker                       map  map                      position  results 0  geometry location                      icon  icon                                          else                     alert  Geocode was not successful due to      status                                                                  for  var i   0  i  lt  originList length  i                    var results   response rows i  elements                geocoder geocode   address   originList i                      showGeocodedAddressOnMap false                  for  var j   0  j  lt  results length  j                      geocoder geocode   address   destinationList j                        showGeocodedAddressOnMap true                      outputDiv innerHTML    originList i      to     destinationList j           results j  distance text     in                        results j  duration text     lt br gt                    outputDiv innerHTML    results j  distance text     lt br gt                                                                     Where origin1  is your location and destinationA is destindation location you can add above two or more data   Rad Full Documentation with an example

User · Answer

There actually seems to be a method in GMap3  It s a static method of the google maps geometry spherical namespace    It takes as arguments two LatLng objects and will utilize a default Earth radius of 6378137 meters  although the default radius can be overridden with a custom value if necessary   Make sure you include    lt script type  text javascript  src  http   maps google com maps api js sensor false amp v 3 amp libraries geometry  gt  lt  script gt    in your head section   The call will be   google maps geometry spherical computeDistanceBetween  latLngA  latLngB

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JAVA     public Double getDistanceBetweenTwoPoints Double latitude1  Double longitude1  Double latitude2  Double longitude2        final int RADIUS EARTH   6371       double dLat   getRad latitude2 - latitude1       double dLong   getRad longitude2 - longitude1        double a   Math sin dLat   2    Math sin dLat   2    Math cos getRad latitude1     Math cos getRad latitude2     Math sin dLong   2    Math sin dLong   2       double c   2   Math atan2 Math sqrt a   Math sqrt 1 - a        return  RADIUS EARTH   c    1000             private Double getRad Double x        return x   Math PI   180

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Example using GPS latitude longitude of 2 points   var latitude1   39 46  var longitude1   -0 36  var latitude2   40 40  var longitude2   -3 68   var distance   google maps geometry spherical computeDistanceBetween new google maps LatLng latitude1  longitude1   new google maps LatLng latitude2  longitude2

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Here is the c  implementation of the this forumula   public class DistanceAlgorithm       const double PIx   3 141592653589793      const double RADIO   6378 16            lt summary gt          This class cannot be instantiated           lt  summary gt      private DistanceAlgorithm                 lt summary gt          Convert degrees to Radians          lt  summary gt           lt param name  x  gt Degrees lt  param gt           lt returns gt The equivalent in radians lt  returns gt      public static double Radians double x                return x   PIx   180                  lt summary gt          Calculate the distance between two places           lt  summary gt           lt param name  lon1  gt  lt  param gt           lt param name  lat1  gt  lt  param gt           lt param name  lon2  gt  lt  param gt           lt param name  lat2  gt  lt  param gt           lt returns gt  lt  returns gt      public static double DistanceBetweenPlaces          double lon1          double lat1          double lon2          double lat2                double dlon    Radians lon2 - lon1           double dlat    Radians lat2 - lat1            double a    Math Sin dlat   2    Math Sin dlat   2     Math Cos Radians lat1     Math Cos Radians lat2      Math Sin dlon   2    Math Sin dlon   2            double angle   2   Math Atan2 Math Sqrt a   Math Sqrt 1 - a            return  angle   RADIO    0 62137   distance in miles

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With google you can do it using the spherical api  google maps geometry spherical computeDistanceBetween  latLngA  latLngB      However  if the precision of a spherical projection or a haversine solution is not precise enough for you  e g  if you re close to the pole or computing longer distances   you should use a different library   Most information on the subject I found on Wikipedia here   A trick to see if the precision of any given algorithm is adequate is to fill in the maximum and minimum radius of the earth and see if the difference might cause problems for your use case  Many more details can be found in this article  In the end the google api or haversine will serve most purposes without problems

User · Answer

To calculate distance on Google Maps  you can use Directions API  That will be one of the easiest way to do it  To get data from Google Server  you can use Retrofit or Volley  Both has their own advantage  Take a look at following code where I have used retrofit to implement it   private void build retrofit and get response String type         String url    https   maps googleapis com maps         Retrofit retrofit   new Retrofit Builder                baseUrl url               addConverterFactory GsonConverterFactory create                 build         RetrofitMaps service   retrofit create RetrofitMaps class        Call lt Example gt  call   service getDistanceDuration  metric   origin latitude         origin longitude dest latitude         dest longitude  type        call enqueue new Callback lt Example gt               Override         public void onResponse Response lt Example gt  response  Retrofit retrofit                 try                     Remove previous line from map                 if  line    null                        line remove                                         This loop will go through all the results and add marker on each location                  for  int i   0  i  lt  response body   getRoutes   size    i                          String distance   response body   getRoutes   get i  getLegs   get i  getDistance   getText                        String time   response body   getRoutes   get i  getLegs   get i  getDuration   getText                        ShowDistanceDuration setText  Distance     distance      Duration     time                       String encodedString   response body   getRoutes   get 0  getOverviewPolyline   getPoints                        List lt LatLng gt  list   decodePoly encodedString                       line   mMap addPolyline new PolylineOptions                                        addAll list                                       width 20                                       color Color RED                                       geodesic true                                                         catch  Exception e                    Log d  onResponse    There is an error                    e printStackTrace                                      Override         public void onFailure Throwable t                Log d  onFailure   t toString                            Above is the code of function build retrofit and get response for calculating distance  Below is corresponding Retrofit Interface   package com androidtutorialpoint googlemapsdistancecalculator    import com androidtutorialpoint googlemapsdistancecalculator POJO Example   import retrofit Call  import retrofit http GET  import retrofit http Query   public interface RetrofitMaps           Retrofit get annotation with our URL    And our method that will return us details of student       GET  api directions json key AIzaSyC22GfkHu9FdgT9SwdCWMwKX1a4aohGifM   Call lt Example gt  getDistanceDuration  Query  units   String units   Query  origin   String origin   Query  destination   String destination   Query  mode   String mode        I hope this explains your query  All the best     Source  Google Maps Distance Calculator

User · Answer

First  are you referring to distance as in length of the entire path or you want to know only the displacement  straight line distance   I see no one is pointing the difference between distance and displacement here  For distance calculate each route point given by JSON XML data  as for displacement there is a built-in solution using Spherical class   calculates distance between two points in km s function calcDistance p1  p2      return  google maps geometry spherical computeDistanceBetween p1  p2    1000  toFixed 2

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Calculates the haversine distance between point A  and B        param  number    latlngA  lat  lng  point A       param  number    latlngB  lat  lng  point B       param  boolean  isMiles If we are using miles  else km          function haversineDistance latlngA  latlngB  isMiles        const squared   x   gt  x   x      const toRad   x   gt   x   Math PI    180      const R   6371     Earth   s mean radius in km      const dLat   toRad latlngB 0  - latlngA 0        const dLon   toRad latlngB 1  - latlngA 1         const dLatSin   squared Math sin dLat   2        const dLonSin   squared Math sin dLon   2         const a   dLatSin                  Math cos toRad latlngA 0      Math cos toRad latlngB 0      dLonSin       const c   2   Math atan2 Math sqrt a   Math sqrt 1 - a        let distance   R   c       if  isMiles  distance    1 609344       return distance        I found a version online which is 80  right but plugged in the wrong parameter and is inconsistent in using the inputs  this version fixed that completely

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Using PHP  you can calculate the distance using this simple function         to calculate distance between two lat   lon  function calculate distance  lat1   lon1   lat2   lon2   unit  N          theta    lon1 -  lon2      dist   sin deg2rad  lat1     sin deg2rad  lat2      cos deg2rad  lat1     cos deg2rad  lat2     cos deg2rad  theta        dist   acos  dist       dist   rad2deg  dist       miles    dist   60   1 1515     unit   strtoupper  unit      if   unit     K         return   miles   1 609344        else if   unit     N           return   miles   0 8684         else           return  miles                function ends here

User · Answer

p1 and p2 are google maps LatLng x y  objects  function calcDistance p1  p2              var d    google maps geometry spherical computeDistanceBetween p1  p2    1000  toFixed 2             console log d

User · Answer

Just add this to the beginning of your JavaScript code   google maps LatLng prototype distanceFrom   function latlng      var lat    this lat    latlng lat      var lng    this lng    latlng lng      var R   6378137    var dLat    lat 1 -lat 0     Math PI   180    var dLng    lng 1 -lng 0     Math PI   180    var a   Math sin dLat 2    Math sin dLat 2      Math cos lat 0    Math PI   180     Math cos lat 1    Math PI   180       Math sin dLng 2    Math sin dLng 2     var c   2   Math atan2 Math sqrt a   Math sqrt 1-a      var d   R   c    return Math round d       and then use the function like this   var loc1   new GLatLng 52 5773139  1 3712427   var loc2   new GLatLng 52 4788314  1 7577444   var dist   loc2 distanceFrom loc1   alert dist 1000

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In my case it was best to calculate this in SQL Server  since i wanted to take current location and then search for all zip codes within a certain distance from current location  I also had a DB which contained a list of zip codes and their lat longs  Cheers  --will return the radius for a given number create function getRad  variable float --function to return rad returns float as begin declare  retval float  select  retval   variable   PI   180  --print  retval return  retval end go  --calc distance --drop function dbo getDistance create function getDistance  cLat float  cLong float   tLat float   tLong float  returns float as begin declare  emr float declare  dLat float declare  dLong float declare  a float declare  distance float declare  c float  set  emr   6371--earth mean  set  dLat   dbo getRad  tLat -  cLat   set  dLong   dbo getRad  tLong -  cLong   set  a   sin  dLat 2  sin  dLat 2  cos dbo getRad  cLat   cos dbo getRad  tLat   sin  dLong 2  sin  dLong 2   set  c   2 atn2 sqrt  a  sqrt 1- a   set  distance    emr  c  set  distance    distance   0 621371 -- i needed it in miles --print  distance return  distance  end  go   --get all zipcodes within 2 miles  the hardcoded   s would be passed in by C  select   from cityzips a where dbo getDistance 29 76 -95 38 a lat a long   lt 3 order by zipcode

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OFFLINE SOLUTION - Haversine Algorithm     In Javascript   var  eQuatorialEarthRadius   6378 1370  var  d2r    Math PI   180 0    function HaversineInM lat1  long1  lat2  long2        return  1000 0   HaversineInKM lat1  long1  lat2  long2       function HaversineInKM lat1  long1  lat2  long2        var dlong    long2 - long1     d2r      var dlat    lat2 - lat1     d2r      var a   Math pow Math sin dlat   2 0   2 0    Math cos lat1    d2r    Math cos lat2    d2r    Math pow Math sin dlong   2 0   2 0       var c   2 0   Math atan2 Math sqrt a   Math sqrt 1 0 - a        var d    eQuatorialEarthRadius   c       return d     var meLat   -33 922982  var meLong   151 083853    var result1   HaversineInKM meLat  meLong  -32 236457779983745  148 69094705162837   var result2   HaversineInKM meLat  meLong  -33 609020205923713  150 77061469270831        C    using System   public class Program       public static void Main                 Console WriteLine  Hello World             var meLat   -33 922982          double meLong   151 083853            var result1   HaversineInM meLat  meLong  -32 236457779983745  148 69094705162837           var result2   HaversineInM meLat  meLong  -33 609020205923713  150 77061469270831            Console WriteLine result1           Console WriteLine result2              static double  eQuatorialEarthRadius   6378 1370D      static double  d2r    Math PI   180D        private static int HaversineInM double lat1  double long1  double lat2  double long2                return  int  1000D   HaversineInKM lat1  long1  lat2  long2               private static  double HaversineInKM double lat1  double long1  double lat2  double long2                double dlong    long2 - long1     d2r          double dlat    lat2 - lat1     d2r          double a   Math Pow Math Sin dlat   2D   2D    Math Cos lat1    d2r    Math Cos lat2    d2r    Math Pow Math Sin dlong   2D   2D           double c   2D   Math Atan2 Math Sqrt a   Math Sqrt 1D - a            double d    eQuatorialEarthRadius   c           return d            Reference  https   en wikipedia org wiki Great-circle distance

[javascript] Calculate distance between two points in google maps V3

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