CODEWITHSUNDEEP
javascriptgoogle-mapsgoogle-maps-api-3
markzzz
markzzz

Reputation: 47945

Google Maps - How to get the distance between two point in metre?

I have these coordinate :

(45.463688, 9.18814) 
(46.0438317, 9.75936230000002)

and I need (trought Google API V3, I think) to get the distance between those 2 points in metre. How can I do it?

Upvotes: 42

Views: 91718

Answers (8)

Undefined function
Undefined function

Reputation: 868

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. The idea is if your are referring to distance then you just use the computeDistanceBetween on each path point and concatenate it.

//calculates distance between two points in km's
function calcDistance(p1, p2) {
  return (google.maps.geometry.spherical.computeDistanceBetween(p1, p2) / 1000).toFixed(2);
}

Upvotes: 0

Undefined function
Undefined function

Reputation: 868

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.

Upvotes: 0

Nguyen Chi Thanh
Nguyen Chi Thanh

Reputation: 21

Try this:

const const toRadians = (val) => {
    return val * Math.PI / 180;
}
const toDegrees = (val) => {
    return val * 180 / Math.PI;
}
// Calculate a point winthin a circle
// circle ={center:LatLong, radius: number} // in metres
const pointInsideCircle = (point, circle) => {
    let center = circle.center;
    let distance = distanceBetween(point, center);

    //alert(distance);
    return distance < circle.radius;
};

const distanceBetween = (point1, point2) => {
   //debugger;
   var R = 6371e3; // metres
   var φ1 = toRadians(point1.latitude);
   var φ2 = toRadians(point2.latitude);
   var Δφ = toRadians(point2.latitude - point1.latitude);
   var Δλ = toRadians(point2.longitude - point1.longitude);

   var a = Math.sin(Δφ / 2) * Math.sin(Δφ / 2) +
           Math.cos(φ1) * Math.cos(φ2) *
           Math.sin(Δλ / 2) * Math.sin(Δλ / 2);
   var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

   return R * c;
}

References: http://www.movable-type.co.uk/scripts/latlong.html

Upvotes: 0

Roman Goyenko
Roman Goyenko

Reputation: 7070

If you're looking to use the v3 google maps API, here is a function to use: Note: you must add &libraries=geometry to your script source

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&libraries=geometry"></script>

<script>
var p1 = new google.maps.LatLng(45.463688, 9.18814);
var p2 = new google.maps.LatLng(46.0438317, 9.75936230000002);

alert(calcDistance(p1, p2));

//calculates distance between two points in km's
function calcDistance(p1, p2) {
  return (google.maps.geometry.spherical.computeDistanceBetween(p1, p2) / 1000).toFixed(2);
}

</script>

Upvotes: 125

PiRX
PiRX

Reputation: 3565

I think you could do without any specific API, and calculate distance with plain Javascript:

This site has good info about geographical calculations and Javascript sample for distance calculation.

Ok, quick glance at Google API page and it seems, you could do it by:

  1. Call DirectionsService().route() to get DirectionsResult with routes
  2. For one or each route go through its legs property and calculate sum of distances

Upvotes: 4

Tommaso
Tommaso

Reputation: 155

Try this

 CLLocationCoordinate2D coord1;
 coord1.latitude = 45.463688;
 coord1.longitude = 9.18814;
 CLLocation *loc1  = [[[CLLocation alloc] initWithLatitude:coord1.latitude longitude:coord1.longitude] autorelease];

 CLLocationCoordinate2D coord2;
 coord2.latitude = 46.0438317;
 coord2.longitude = 9.75936230000002;
 CLLocation *loc2  = [[[CLLocation alloc] initWithLatitude:46.0438317 longitude:9.75936230000002] autorelease];

 CLLocationDistance d1 = [loc1 distanceFromLocation:loc2];

Upvotes: 1

Pixelmixer
Pixelmixer

Reputation: 319

This is primarily done with math outside of the google api, so you shouldn't need to use the API for anything other than finding the correct coordinates.

Knowing that, here's a link to a previously answered question relating to Javascript.

Calculate distance between 2 GPS coordinates

Upvotes: 1

Rob
Rob

Reputation: 4947

http://www.csgnetwork.com/gpsdistcalc.html

Has nothing to do with coding btw

EDIT if you're looking for some code

Calculate distance between two points in google maps V3

Upvotes: 1

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