How to generate coordinates in between two known points

Question

Background:

I\'m working with transport routes and Google provides Route points far apart enough to create \'shapes\'. These are the bus/train route

Answer 1

Step 1 - Get the overall distance

Comprehensive answer can be found here: http://www.movable-type.co.uk/scripts/latlong.html

TL;DR:

This uses the ‘haversine’ formula to calculate the great-circle distance between two points – that is, the shortest distance over the earth’s surface – giving an ‘as-the-crow-flies’ distance between the points (ignoring any hills, of course!).

var R = 6371; // km
var dLat = (lat2-lat1).toRad();
var dLon = (lon2-lon1).toRad();
var lat1 = lat1.toRad();
var lat2 = lat2.toRad();

var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
        Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
var distance = R * c;

Step 2 - Get the percentage travelled.

Now you have the distance for this straight line, you can then work out a percentage of the overall distance for each 5 meters.

Step 3 - Apply the percentage travelled to the difference between the Latitude and Longitude

Find out the difference between the starting latitude and the final latitude. With this number, multiply it by the percentage traveled (as a decimal). This can then be added back to the starting latitude to find the current latitude of this point. Repeat for longitude.