tobyprivett

{
"vessel_info": {
"id": "8d435f12-8373-47c8-968d-a4881e9cd76c",
"name": "GOGOGOGOG1",
"hin": "",
"make_and_model": null,
"number_of_hulls": "1",
"created_at": "2018-09-10T13:14:03+01:00",
"updated_at": "2018-10-17T10:42:03+01:00",
"mmsi_number": "",

tobyprivett

// from https://rosettacode.org/wiki/Haversine_formula#Elixir

defmodule Haversine do
  @v  :math.pi / 180
  @r  6372.8            # km for the earth radius
  def distance({lat1, long1}, {lat2, long2}) do
    dlat  = :math.sin((lat2 - lat1) * @v / 2)
    dlong = :math.sin((long2 - long1) * @v / 2)
    a = dlat * dlat + dlong * dlong * :math.cos(lat1 * @v) * :math.cos(lat2 * @v)
    @r * 2 * :math.asin(:math.sqrt(a))

tobyprivett

// php implementation from http://stackoverflow.com/questions/14750275/haversine-formula-with-php
I calculate distances straight inside queries, using the following stored procedure:

CREATE FUNCTION GEODIST (lat1 DOUBLE, lon1 DOUBLE, lat2 DOUBLE, lon2 DOUBLE)
    RETURNS DOUBLE
    DETERMINISTIC
        BEGIN
            DECLARE dist DOUBLE;
            SET dist =  round(acos(cos(radians(lat1))*cos(radians(lon1))*cos(radians(lat2))*cos(radians(lon2)) + cos(radians(lat1))*sin(radians(lon1))*cos(radians(lat2))*sin(radians(lon2)) + sin(radians(lat1))*sin(radians(lat2))) * 6378.8, 1);
            RETURN dist;

tobyprivett

// php implementation from http://stackoverflow.com/questions/14750275/haversine-formula-with-php
I calculate distances straight inside queries, using the following stored procedure:

CREATE FUNCTION GEODIST (lat1 DOUBLE, lon1 DOUBLE, lat2 DOUBLE, lon2 DOUBLE)
    RETURNS DOUBLE
    DETERMINISTIC
        BEGIN
            DECLARE dist DOUBLE;
            SET dist =  round(acos(cos(radians(lat1))*cos(radians(lon1))*cos(radians(lat2))*cos(radians(lon2)) + cos(radians(lat1))*sin(radians(lon1))*cos(radians(lat2))*sin(radians(lon2)) + sin(radians(lat1))*sin(radians(lat2))) * 6378.8, 1);
            RETURN dist;

tobyprivett

//https://developers.google.com/maps/documentation/javascript/reference#spherical

computeOffset(from:LatLng, distance:number, heading:number, radius?:number)

tobyprivett

// from: http://www.movable-type.co.uk/scripts/latlong-vincenty.html
var sinα1 = Math.sin(α1);
var cosα1 = Math.cos(α1);

var tanU1 = (1-f) * Math.tan(φ1), cosU1 = 1 / Math.sqrt((1 + tanU1*tanU1)), sinU1 = tanU1 * cosU1;
var σ1 = Math.atan2(tanU1, cosα1);
var sinα = cosU1 * sinα1;
var cosSqα = 1 - sinα*sinα;
var uSq = cosSqα * (a*a - b*b) / (b*b);
var A = 1 + uSq/16384*(4096+uSq*(-768+uSq*(320-175*uSq)));

tobyprivett

#!/usr/bin/ruby
#
# This script installs to /usr/local only. To install elsewhere you can just
# untar https://github.com/mxcl/homebrew/tarball/master anywhere you like.
#
#
# 30th March 2010:
#   Added a check to make sure user is in the staff group. This was a problem
#   for me, and I think it was due to me migrating my account over several
#   versions of OS X. I cannot verify that for sure, and it was tested on