I have a Users table that contains latitude and longitude attribute for every user. So I need to calculate the distance between two users in AQL Query.
I have done the same in Orientdb with the below query.
var laltitude = CURRENT_USER_laltitude;
var longitude = CURRENT_USER_longitude;
var query = "select distance(latitude, longitude,"+laltitude+","+longitude+") as distance from users";
First, create a js file distance.js (or whatever you want to name it) and put below code as below.
/* distance.js */
'use strict';
function gdistance(latitude1, longitude1, latitude2, longitude2, radius) {
if (!latitude1 || !longitude1 || !latitude2 || !longitude2) {
return null;
};
var lat1 = Number(latitude1), lon1 = Number(longitude1);
var lat2 = Number(latitude2), lon2 = Number(longitude2);
radius = (radius === undefined) ? 6371e3 : Number(radius);
var R = radius;
var φ1 = (lat1 * Math.PI / 180), λ1 = (lon1 * Math.PI / 180);
var φ2 = (lat2 * Math.PI / 180), λ2 = (lon2 * Math.PI / 180);
var Δφ = φ2 - φ1;
var Δλ = λ2 - λ1;
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));
var d = R * c; // Meters
var d2 = d / 1000; // Meters to KM
return d2;
}
module.exports = gdistance;
Now open Arango Console with arangosh
. This will open with _system
database by default. So if you have other than this database like me then use db._useDatabase("myDatabase")
command to change database.
Now write below commands to add custom to your desired database.
Version 2.8
db._useDatabase("myDatabase");
var aqlfunctions = require("org/arangodb/aql/functions");
var f = require("/path/to/file/distance.js");
aqlfunctions.register("geo::gdistance", f, true)
Version 3.0+
db._useDatabase("myDatabase");
var aqlfunctions = require("@arangodb/aql/functions");
var f = require("/path/to/distance.js");
i.e.
var f = require("/home/ubuntu/distance.js");
var f = require("distance.js");
# If you want to remove this group's UDFs (User defined functions)
# aqlfunctions.unregisterGroup("geo");
aqlfunctions.register("geo::gdistance", f, true);
Now use in your AQL queries as below.
LET distance = geo::gdistance(attrbute_name.latitude, attrbute_name.longitude, @your_latitude, @your_longitude)
For more references with here.