Google Maps - How to get the distance between two

问题:

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?

回答1:

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>

回答2:

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

回答3:

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

回答4:

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

回答5:

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];

回答6:

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