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Using Turf to measure how far a line travels through a polygon
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>A simple map</title> | |
| <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' /> | |
| <script src='https://api.mapbox.com/mapbox.js/v2.2.2/mapbox.js'></script> | |
| <link href='https://api.mapbox.com/mapbox.js/v2.2.2/mapbox.css' rel='stylesheet' /> | |
| <script src='https://api.mapbox.com/mapbox.js/plugins/turf/v2.0.2/turf.min.js'></script> | |
| <style> | |
| body { margin:0; padding:0; } | |
| #map { position:absolute; top:0; bottom:0; width:100%; } | |
| p.distance-container { | |
| position: absolute; | |
| z-index: 10; | |
| font-size: 2em; | |
| margin: 1em; | |
| right: 0em; | |
| width: 8em; | |
| background-color: #fff; | |
| padding: 0.5em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id='map'> | |
| <p class='distance-container'>The line travels through the polygon for <span id="distance"></span> miles.</p> | |
| </div> | |
| <script> | |
| L.mapbox.accessToken = 'pk.eyJ1IjoiZGFuc3dpY2siLCJhIjoiY2l1dTUzcmgxMDJ0djJ0b2VhY2sxNXBiMyJ9.25Qs4HNEkHubd4_Awbd8Og'; | |
| var map = L.mapbox.map('map', 'mapbox.streets'); | |
| var poly = { | |
| "type": "Feature", | |
| "properties": {}, | |
| "geometry": { | |
| "type": "Polygon", | |
| "coordinates": [ | |
| [ | |
| [ | |
| 51.17431640625, | |
| 47.025206001585396 | |
| ], | |
| [ | |
| 45.17578125, | |
| 43.13306116240612 | |
| ], | |
| [ | |
| 54.5361328125, | |
| 41.85319643776675 | |
| ], | |
| [ | |
| 51.17431640625, | |
| 47.025206001585396 | |
| ] | |
| ] | |
| ] | |
| } | |
| } | |
| var line = { | |
| "type": "Feature", | |
| "properties": {}, | |
| "geometry": { | |
| "type": "LineString", | |
| "coordinates": [ | |
| [ | |
| 42.78076171875, | |
| 46.01222384063236 | |
| ], | |
| [ | |
| 56.865234375, | |
| 44.26093725039923 | |
| ] | |
| ] | |
| } | |
| } | |
| var polygon = L.mapbox.featureLayer(poly); | |
| var polyline = L.mapbox.featureLayer(line).addTo(polygon); | |
| polygon.addTo(map); | |
| map.on('ready', function() { | |
| map.fitBounds(polygon.getBounds()); | |
| }); | |
| var intersection = Math.round(turf.lineDistance(turf.intersect(poly, line), 'miles') * 100 / 100); | |
| document.getElementById('distance').innerHTML = intersection; | |
| </script> | |
| </body> | |
| </html> |
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