Line crossing the date line

Using unwrapped coordinates to cross the line

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Line crossing the date line</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.mapbox.com/mapbox.js/v3.1.1/mapbox.js'></script>
<link href='https://api.mapbox.com/mapbox.js/v3.1.1/mapbox.css' rel='stylesheet' />
<style>
  body { margin:0; padding:0; }
  #map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>

<script>
L.mapbox.accessToken = '<your access token here>';
var map = L.mapbox.map('map', 'mapbox.streets')
    .setView([37.9, -77], 6);

L.geoJson({
    type: 'Feature',
    geometry: {
        type: 'LineString',
        // The coordinate -233.9 is technically invalid but Leaflet
        // permits it because it can imply the direction of wrapping -
        // to wrap in a direction, you can add or subtract 360 from
        // the desired end coordinate.
        coordinates: [[-77, 37.9], [-233.9, 36.5]]
    },
    properties: {
    "stroke": "#ff8888",
    "stroke-opacity": 1,
    "stroke-width": 4,
    }
  }, { style: L.mapbox.simplestyle.style }).addTo(map);
</script>
to create your own custom map and use it in this example.
Use this example by copying its source into your own HTML page and replacing the Map ID with one of your own from your projects. Having trouble with JavaScript? Try out Codecademy or contact our support team.
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