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dist-test.html
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dist-test.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>
Distance Test
</title>
<link rel="stylesheet"
href="css/testcss.css"
type="text/css">
<script src="js/jquery-2.0.3.js"
type="text/javascript">
</script>
<script src="js/geodesic.js"
type="text/javascript">
</script>
<script type="text/javascript">
var startTime = new Date();
var navaids = [];
// load navaids
function callbackNavaids() {
if ( this.readyState == 4 ) {
var dataLines = this.responseText;
dataLines = dataLines.split(/\r\n|\n/);
var max = dataLines.length;
var separator = ',';
// start at 1 to SKIP the first 'title' line of the CSV file
for ( var i = 1; i < max; i++ ) {
navaids.push( dataLines[i].split( separator ) );
}
max = navaids.length;
var d = new Date();
var ms = d.valueOf() - startTime.valueOf();
var msg = 'Loaded '+max+' navaids from csv in '+ms+' ms';
console.log(msg);
$("#results").html('<p>'+msg+'<\/p>');
}
}
function requestFile( fname, callback ) {
var xmlhttp = new XMLHttpRequest();
xmlhttp.open( 'GET', fname, true );
xmlhttp.onreadystatechange = callback;
xmlhttp.send( null );
}
var tableheader = "<div align='center'><table align='center' cellspacing='4'>"+
"<tr>"+
"<th>type<\/th>"+
"<th>lat<\/th>"+
"<th>lon<\/th>"+
"<th>feet<\/th>"+
"<th>freq<\/th>"+
"<th>rng<\/th>"+
"<th>bear<\/th>"+
"<th>id<\/th>"+
"<th>icao<\/th>"+
"<th>rwy<\/th>"+
"<th>name<\/th>";
//"<\/tr>";
function show_found(navs,targ,type) {
var max = navs.length;
var html = "";
var cnt = 11;
var addlink = 25;
var lnnum = 0;
if (max) {
html = tableheader;
if (type == 2) {
cnt = 12;
html += "<th>dist<\/th>";
}
html += "<\/tr>";
}
var i, nav, j, nlat, nlon;
var maxlat = -90;
var maxlon = -180;
var minlat = 90;
var minlon = 180;
for (i = 0; i < max; i++) {
nav = navs[i];
html += "<tr>";
for (j = 0; j < cnt; j++) {
if (j == 11) {
html += "<td align='right'>";
html += ""+nav[j].toFixed(2)+"<\/td>";
} else {
if (j < 7)
html += "<td align='right'>";
else
html += "<td>";
html += ""+nav[j]+"<\/td>";
}
}
html += "<\/tr>";
lnnum++;
if (lnnum >= addlink) {
lnnum = 0;
html += "<tr>";
html += "<td colspan="+cnt+" align='center'>";
html += "<a href='#top'>top<\/a> <a href='#bottom'>bottom<\/a>";
html += "<\/td>";
html += "<\/tr>";
}
nlat = parseFloat(nav[1]);
nlon = parseFloat(nav[2]);
if (nlat > maxlat)
maxlat = nlat;
if (nlat < minlat)
minlat = nlat;
if (nlon > maxlon)
maxlon = nlon;
if (nlon < minlon)
minlon = nlon;
}
if (max) {
html += "<\/table>";
html += "<\/div>";
html += "<p>BBOX: "+minlat+","+minlon+","+maxlat+","+maxlon+" ";
var lats = maxlat - minlat;
var lons = maxlon - minlon;
html += "Span "+lats.toFixed(8)+','+lons.toFixed(8)+" degrees. ";
var dist = getDistance(minlat,minlon,maxlat,maxlon);
var dr = getDistRect(minlat,minlon,maxlat,maxlon);
html += "Radial: "+dist.toFixed(2)+" (rect "+dr.toFixed(2)+") Km. ";
html += "<a href='#top'>top<\/a> <a href='#bottom'>bottom<\/a>";
html += "<\/p>";
}
if (targ == 1)
$("#results").html(html);
else
$("#results2").html(html);
}
// 0 1 2 3 4 5 6 7 8 9 10
// type,lat, lon, feet,freq, rng,bear, id, icao,rwy,"name"
// 2, 38.08777778,-077.32491667,0, 396, 50, 0.0, APH, , , "A P HILL NDB"
// 3, 59.20716700,017.01208300, 0, 11680,80, 3.0, DKR, , , "DUNKER VOR"
// 3, 42.49055556,-079.27411111,680, 11620,130,-7.0, DKK, , , "DUNKIRK VORTAC"
// 3, 43.82827778,-110.33547222,7720,11720,130,15.0, DNW, , , "DUNOIR VOR-DME"
// 4, 49.43206100,007.57322800, 780, 11050,18, 262.262, IRWL,ETAR,26, "ILS-cat-III"
// 5, 58.22567800,-006.33297500,26, 11090,18, 354.293, SOY, EGPO,36, "LOC"
// 6, 36.27208600,006.63146400, 2303,10930,10, 300316.215,CT, DABC,32, "GS"
// 7, 40.00144200,-083.02929400,815, 0, 0, 94.235, ----,KCMH,10R,"OM"
// 8, 39.79342534,-104.52811126,5512,0, 0, 271.156, ----,KFTG,26, "MM"
// 9, 47.61215800,-117.54695600,2313,0, 0, 61.968, ----,KGEG,03, "IM"
// 12, 65.74222222,-019.57750000,16, 10970,18, 0.000, IKR, BIKR,01, "DME-ILS"
// 13, 51.15472200,000.64805600, 72, 11595,15, 0.0, LSH, , , "LASHENDEN NDB-DME"
// 13, 48.19050000,010.85900000, 1838,10880,40, 0.0, LCH, , , "LECHFELD TACAN"
// distance = d = acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(lon1-lon2));
// as what? assume m??
//
function scan_navaids_dist(lat,lon,dist) {
var max = navaids.length;
var i, nav, nlat, nlon, d;
var found = [];
for (i = 0; i < max; i++) {
nav = navaids[i];
nlat = nav[1];
nlon = nav[2];
d = getDistance(lat, lon, nlat, nlon);
if (d <= dist)
found.push(nav);
}
return found;
}
function scan_navaids_dist2(lat,lon,dist) {
var max = navaids.length;
var i, nav, nlat, nlon, d;
var found = [];
for (i = 0; i < max; i++) {
nav = navaids[i];
nlat = nav[1];
nlon = nav[2];
d = getDistRect(lat, lon, nlat, nlon);
if (d <= dist)
found.push(nav);
}
return found;
}
function scan_navaids_dist2s(lat,lon,dist) {
var max = navaids.length;
var i, nav, nlat, nlon, d;
var found = [];
for (i = 0; i < max; i++) {
nav = navaids[i];
nlat = nav[1];
nlon = nav[2];
d = getDistRect(lat, lon, nlat, nlon);
if (d <= dist) {
nav.push(d);
found.push(nav);
}
}
// sort by the distance
found.sort(function(a, b) { return (a[11] < b[11] ? -1 : (a[11] > b[11] ? 1 : 0)); });
return found;
}
function scan_navaids_icao(icao) {
var max = navaids.length;
var i, nav, nic;
var found = [];
for (i = 0; i < max; i++) {
nav = navaids[i];
nic = nav[8];
if (nic == icao)
found.push(nav);
}
return found;
}
function getbydist() {
var lat = $("#lat")[0].value;
var lon = $("#lon")[0].value;
var dist = $("#dist")[0].value;
console.log("Submit clicked for lat "+lat+", lon "+lon+' dist '+dist);
var d1 = new Date();
var navs = scan_navaids_dist(lat,lon,dist);
var d2 = new Date();
var cnt = navs.length;
var max = navaids.length;
var ms = d2.valueOf() - d1.valueOf();
var msg = "1: For lat,lon "+lat+","+lon+" dist "+dist+" a scan of "+max+" navaids, found "+cnt+", took "+ms+" ms";
console.log(msg);
$("#scanres").html("<p>"+msg+"<\/p>");
show_found(navs,1,1);
getbydist2(lat,lon,dist);
}
function getbydist2(lat,lon,dist) {
//var lat = $("#lat")[0].value;
//var lon = $("#lon")[0].value;
//var dist = $("#dist")[0].value;
//console.log("Submit clicked for lat "+lat+", lon "+lon+' dist '+dist);
var d1 = new Date();
var navs = scan_navaids_dist2s(lat,lon,dist);
var d2 = new Date();
var cnt = navs.length;
var max = navaids.length;
var ms = d2.valueOf() - d1.valueOf();
var msg = "2: For lat,lon "+lat+","+lon+" dist "+dist+" a scan of "+max+" navaids, found "+cnt+", took "+ms+" ms";
console.log(msg);
$("#scanres2").html("<p>"+msg+"<\/p>");
show_found(navs,2,2);
}
function getbyicao() {
var icao = $("#icao")[0].value;
console.log("Submit clicked for icao "+icao);
var d1 = new Date();
var navs = scan_navaids_icao(icao);
var cnt = navs.length;
var d2 = new Date();
var max = navaids.length;
var ms = d2.valueOf() - d1.valueOf();
var msg = "For icao "+icao+" a scan of "+max+" navaids, found "+cnt+", took "+ms+" ms";
console.log(msg);
$("#scanres").html("<p>"+msg+"<\/p>");
show_found(navs,1,1);
$("#scanres2").html("");
$("#results2").html("");
}
</script>
</head>
<body>
<a name="top"></a>
<h1 align="center">
Distance Test 1
</h1>
<p>
Looking for the FASTEST way to calculate the distance between two WSG-84 lat,lon points.
Here using geodesic.js, which is based on formulai from <a target="_blank"
href="http://movable-type.co.uk/scripts/latlong.html">here</a>, using the 'haversine' to
calculate great-circle distance. But it uses 7 trig + 2 sqrts. That page also gives
an 'equirectangular approximation' using only 1 trig & 1 sqrt, which may be accurate
enough for this search for nearby navaids. In tests this getDistRect() took 1/3 to less than 1/4
of the time, so it FASTER, and have not seen any 'big' difference in the lists. EVEN with
array of array sorting by distance, still remained 1/3 or less time.
</p>
<form action="#">
Latitude: <input type="text"
name="lat"
id="lat"
value="48.72698"> Longitude: <input type="text"
name="lon"
id="lon"
value="2.370448"> Distance: <input type="text"
name="dist"
id="dist"
value="200">
<br>
<input type="button"
value="Submit"
onclick="getbydist();">
</form>
<form action="#">
ICAO: <input type="text"
name="icao"
id="icao"
value="KSFO">
<br>
<input type="button"
value="Submit"
onclick="getbyicao();">
</form>
<div id="scanres">
Scanned:
</div>
<div id="results">
Results:
</div>
<div id="scanres2">
Scanned2:
</div>
<div id="results2">
Results2:
</div>
<p align="center"><a href="#top">top</a></p>
<script type="text/javascript"
defer="defer">
requestFile( 'data2/apt1000-nav.csv', callbackNavaids );
</script>
<a name="bottom"></a>
</body>
</html>