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distance.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<!--
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<link href="data:image/x-icon;base64,AAABAAEAEBAQAAEABAAoAQAAFgAAACgAAAAQAAAAIAAAAAEABAAAAAAAgAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAP//AP///wANAP8A5Dz6ABueRwAAt/8A6BonABo86AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAREREREREREREREAAAEREREREQCIgREREd3dwAAB3d3d3d3d3d3d3d3d3d3d3d3d3VVVVVVVQAFVVAAVVVQIiBRAiIBEQIAIBECAAERAgAgFgIABmYCIiBmAiIGZgIiIGYCIgZmYCIAaIAAMzMzAAiIiIiIiIiIiIiIiIiIiIiIgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" rel="icon" type="image/x-icon" />
<!--Stop Google:-->
<META NAME="robots" CONTENT="noindex,nofollow">
</head>
<body>
<a href= "index.html">HOME</a>
<h1>DISTANCE CALCULATOR</h1>
<table>
<tr>
<td>lat1:</td>
<td>
<input id = "lat1"/>
</td>
<td>lon1:</td>
<td>
<input id = "lon1"/>
</td>
</tr>
<tr>
<td>lat2:</td>
<td>
<input id = "lat2"/>
</td>
<td>lon2:</td>
<td>
<input id = "lon2"/>
</td>
</tr>
</table>
<h2 id = "distance"></h2>
<h2 id = "deltax"></h2>
<h2 id = "deltay"></h2>
<p>
360 degrees latitude = 40,000,000 m, by definition prior to the <a href = "https://www.bipm.org/en/measurement-units">quantum SI</a>
</p>
<p>
0.1 degrees lat = 11.1 km, 0.1 degrees lon = 8.6 km
</p>
<p>
0.01 degrees lat = 1.1 km, 0.01 degrees lon = 860 m
</p>
<p>
0.001 degrees lat = 111 m, 0.001 degrees lon = 86 m
</p>
<p>
0.0001 degrees lat = 11 m, 0.0001 degrees lon = 9 m
</p>
<em>last decimal place is about 10 meters for 4 decimal places, beyond which lat/lons are of limited use</em>
</body>
<script>
//360 degrees lat = 40,000,000 meters
//maple lawn blvd
lat1 = 39.1471;
lon1 = -76.9072;
//scaggsville road
lat2 = 39.1451;
lon2 = -76.9041
deltay = 0;
deltax = 0;
distance=0;
redraw();
document.getElementById("lat1").value = lat1;
document.getElementById("lon1").value = lon1;
document.getElementById("lat2").value = lat2;
document.getElementById("lon2").value = lon2;
document.getElementById("lat1").onchange = function(){
lat1 = this.value;
redraw();
}
document.getElementById("lon1").onchange = function(){
lon1 = this.value;
redraw();
}
document.getElementById("lat2").onchange = function(){
lat2 = this.value;
redraw();
}
document.getElementById("lon2").onchange = function(){
lon2 = this.value;
redraw();
}
function redraw(){
cosine = Math.cos(lat1*Math.PI/180);
deltay = (lat2 - lat1)*4e7/360;//degrees to meters
deltax = (lon2 - lon1)*cosine*4e7/360;
distance = Math.round(Math.sqrt(deltax*deltax + deltay*deltay));
distance_feet = Math.round(3.281*distance/10)*10;
distance_miles = Math.round(100*distance_feet/5280)/100;
document.getElementById("distance").innerHTML = "d = " + distance.toString() + " m = " + distance_feet.toString() + " ft = " + distance_miles + " miles";
document.getElementById("deltax").innerHTML = "dx = " + Math.round(deltax).toString() + " m";
document.getElementById("deltay").innerHTML = "dy = " + Math.round(deltay).toString() + " m";
}
</script>
<style>
body,input{
color:#00ff00;
font-family:courier;
background-color:black;
font-size:2em;
}
input{
border:solid;
border-color:#00ff00;
font-size:1em;
}
a{
color:#ff2cb4;
}
</style>
</html>