Question

I have db table which has location details like postal code, long/lat data, region, city etc..
I am using this data to display users location in my web application. Now I want to sort places searched by user according to distance, like nearest place first. How can I calculate distance between users current lcation and the places he has searched and then sorting the result as per distance.

Answer 1

i just have this function for calculate distance between two latitude,longitude, pleaes have a look if its helpful to you.

function distance(lat1, lon1, lat2, lon2, unit) {
    var radlat1 = Math.PI * lat1/180
    var radlat2 = Math.PI * lat2/180
    var radlon1 = Math.PI * lon1/180
    var radlon2 = Math.PI * lon2/180
    var theta = lon1-lon2
    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
    if (unit=="K") { dist = dist * 1.609344 }
    if (unit=="N") { dist = dist * 0.8684 }
    return dist
}