Google Places API closest supermarket

Question

I know I can find the closest supermarkets with this Google API like this:

https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=51.360229, 6.042169&radius=3000&type=supermarket&key=myKey

But now I get many results.

How do I only get the closest one?

Answer 1

you can use rankby option with distance parameter

var request = {
  location: gps,
  types: ['grocery'],
  rankBy: google.maps.places.RankBy.DISTANCE, 
  key: key 
};

reference : https://developers.google.com/places/web-service/search

once you have multiple location use haversine formula to get the distance between two locations.

 function distance(p1, p2) {
      if (!p1 || !p2) 
       return 0;
      var R = 6371000; // Radius of the Earth in m
      var dLat = (p2.lat() - p1.lat()) * Math.PI / 180;
      var dLon = (p2.lng() - p1.lng()) * Math.PI / 180;
      var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
      Math.cos(p1.lat() * Math.PI / 180) * Math.cos(p2.lat() * Math.PI / 180) *
      Math.sin(dLon / 2) * Math.sin(dLon / 2);
      var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
      var d = R * c;
      return d;
     }

reference : https://www.movable-type.co.uk/scripts/latlong.html