Google Maps Api v3 - find nearest markers

Question

When i click on map  which will be best way to find nearest marker or markers  is there some functions in api that will help me to do that    it s google map api v3

User · Answer

You can use the computeDistanceBetween   method in the google maps geometry spherical namespace

User · Answer

Here is another function that works great for me  returns distance in kilometers    function distance lat1  lng1  lat2  lng2            var radlat1   Math PI   lat1   180          var radlat2   Math PI   lat2   180          var radlon1   Math PI   lng1   180          var radlon2   Math PI   lng2   180          var theta   lng1 - lng2          var radtheta   Math PI   theta   180          var dist   Math sin radlat1    Math sin radlat2    Math cos radlat1    Math cos radlat2    Math cos radtheta           dist   Math acos dist           dist   dist   180   Math PI          dist   dist   60   1 1515             Get in in kilometers         dist   dist   1 609344           return dist

User · Answer

Are you aware of Mysql Spatial extensions   You could use something like MBRContains g1 g2

User · Answer

I d like to expand on Leor s suggestion for anyone confused on how to compute the nearest location and actually provide a working solution   I m using markers in a markers array e g  var markers         Then let s have our position as something like var location   new google maps LatLng 51 99  -0 74    Then we simply reduce our markers against the location we have like so   markers reduce function  prev  curr         var cpos   google maps geometry spherical computeDistanceBetween location position  curr position       var ppos   google maps geometry spherical computeDistanceBetween location position  prev position        return cpos  lt  ppos   curr   prev      position   What pops out is your closest marker LatLng object

User · Answer

Use computeDistanceBetween   Google map API method to calculate near marker between your location and markers list on google map   Steps -    Create marker on google map  function addMarker location      var marker   new google maps Marker       title   User added marker       icon          path  google maps SymbolPath BACKWARD CLOSED ARROW        scale  5            position  location      map  map         On Mouse click create event for getting lat  long of your location and pass that to find closest marker       function find closest marker event          var distances             var closest   -1        for  i   0  i  lt  markers length  i              var d   google maps geometry spherical computeDistanceBetween markers i  position  event latLng           distances i    d          if  closest    -1    d  lt  distances closest               closest   i                          alert  Closest marker is      markers closest  getTitle              visit this link follow the steps  You will able to get nearer marker to your location

User · Answer

First you have to add the eventlistener  google maps event addListener map   click   find closest marker     Then create a function that loops through the array of markers and uses the haversine formula to calculate the distance of each marker from the click   function rad x   return x Math PI 180   function find closest marker  event         var lat   event latLng lat        var lng   event latLng lng        var R   6371     radius of earth in km     var distances           var closest   -1      for  i 0 i lt map markers length  i               var mlat   map markers i  position lat            var mlng   map markers i  position lng            var dLat    rad mlat - lat           var dLong   rad mlng - lng           var a   Math sin dLat 2    Math sin dLat 2                Math cos rad lat     Math cos rad 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          distances i    d          if   closest    -1    d  lt  distances closest                  closest   i                       alert map markers closest  title       This keeps track of the closest markers and alerts its title   I have my markers as an array on my map object

User · Answer

The formula above didn t work for me  but I used this without any issue  Pass your current location to the function  and loop through an array of markers to find the closest   function find closest marker  lat1  lon1             var pi   Math PI      var R   6371    equatorial radius     var distances           var closest   -1       for  i 0 i lt markers length  i                 var lat2   markers i  position lat            var lon2   markers i  position lng             var chLat   lat2-lat1          var chLon   lon2-lon1           var dLat   chLat  pi 180           var dLon   chLon  pi 180            var rLat1   lat1  pi 180           var rLat2   lat2  pi 180            var a   Math sin dLat 2    Math sin dLat 2                         Math sin dLon 2    Math sin dLon 2    Math cos rLat1    Math cos rLat2            var c   2   Math atan2 Math sqrt a   Math sqrt 1-a             var d   R   c           distances i    d          if   closest    -1    d  lt  distances closest                  closest   i                           debug  The closest marker is      console log markers closest

[google-maps] Google Maps Api v3 - find nearest markers

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