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Created August 16, 2019 17:36
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Example of loading large geojson into Mapbox GL JS
Raw
readme.md

Example - Large geojson in Mapbox GL JS

* Load svg icon appears while data is loading
* Uncompressed geojson file is 29 MB on dropbox
* Total time to load depends on client internet speed & client GPU
* Geojson source is split into two parts to optimize load and render time
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title></title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0-beta.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0-beta.1/mapbox-gl.css' rel='stylesheet' />
<link href='https://www.mapbox.com/base/latest/base.css' rel='stylesheet' />
<style>
body {
margin: 0;
padding: 0;
}
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
.map-overlay {
position: absolute;
width: 180px;
top: 0;
left: 10px;
padding: 10px;
margin-left: 5px;
margin-top: 2px;
margin-bottom: 2px;
margin-right: 5px;
z-index: 1;
}
.map-overlay .map-overlay-inner {
background: rgba(0, 0, 0, .8);
color: #fff;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.10);
border-radius: 3px;
padding: 10px;
margin-bottom: 10px;
z-index: 1;
}
.map-overlay-inner fieldset {
border: none;
padding: 0;
margin: 0 0 10px;
z-index: 1;
}
/* Dark attribution */
.mapboxgl-ctrl.mapboxgl-ctrl-attrib {
background: rgba(0, 0, 0, .8);
}
.mapboxgl-ctrl.mapboxgl-ctrl-attrib a {
color: #fff;
}
/* Dark popup */
.mapboxgl-popup-content {
background-color: #202020;
color: #fff;
margin-left: 5px;
margin-top: 2px;
margin-bottom: 2px;
margin-right: 5px;
z-index: 1000;
}
.mapboxgl-popup-anchor-bottom-left .mapboxgl-popup-tip,
.mapboxgl-popup-anchor-bottom-right .mapboxgl-popup-tip,
.mapboxgl-popup-anchor-bottom .mapboxgl-popup-tip {
border-top-color: #202020;
}
.mapboxgl-popup-anchor-top-left .mapboxgl-popup-tip,
.mapboxgl-popup-anchor-top-right .mapboxgl-popup-tip,
.mapboxgl-popup-anchor-top .mapboxgl-popup-tip {
border-bottom-color: #202020;
}
.mapboxgl-popup-anchor-right .mapboxgl-popup-tip {
border-left-color: #202020;
}
.mapboxgl-popup-anchor-left .mapboxgl-popup-tip {
border-right-color: #202020;
}
#popup-menu ul,
#menu li {
margin: 0;
padding: 0;
z-index: 100;
}
.mapboxgl-ctrl-group {
-webkit-filter: invert(100%);
}
.loader {
margin: -10px 0 0 -250px;
height: 100px;
width: 20%;
position: fixed;
text-align: center;
padding: 1em;
top: 50%;
left: 50%;
margin: 0 auto 1em;
z-index: 9999;
}
/*
Set the color of the icon
*/
svg path,
svg rect {
fill: #FF6700;
}
</style>
</head>
<body>
<div id='map'></div>
<div class='map-overlay top'>
<div class='map-overlay-inner'>
<fieldset>
<label><b>Select property</b></label>
<select id='prop' name='prop'>
<option value='CYC_INJ'>Cyclist Injuries</option>
<option value='CYC_KIL'>Cyclist Fatalities</option>
<option value='PED_INJ'>Pedestrian Injuries</option>
<option value='PED_KIL'>Pedestrian Fatalities</option>
</select>
</fieldset>
<b><a href="https://data.cityofnewyork.us/Public-Safety/NYPD-Motor-Vehicle-Collisions/h9gi-nx95" target="_blank">NYC Open Data</a></b>
</div>
</div>
<div class="loader loader--style1" title="0" id="loader">
<svg version="1.1" id="loader-1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="40px" height="40px" viewBox="0 0 40 40" enable-background="new 0 0 40 40" xml:space="preserve">
<path opacity="0.2" fill="#000" d="M20.201,5.169c-8.254,0-14.946,6.692-14.946,14.946c0,8.255,6.692,14.946,14.946,14.946
s14.946-6.691,14.946-14.946C35.146,11.861,28.455,5.169,20.201,5.169z M20.201,31.749c-6.425,0-11.634-5.208-11.634-11.634
c0-6.425,5.209-11.634,11.634-11.634c6.425,0,11.633,5.209,11.633,11.634C31.834,26.541,26.626,31.749,20.201,31.749z" />
<path fill="#000" d="M26.013,10.047l1.654-2.866c-2.198-1.272-4.743-2.012-7.466-2.012h0v3.312h0
C22.32,8.481,24.301,9.057,26.013,10.047z">
<animateTransform attributeType="xml" attributeName="transform" type="rotate" from="0 20 20" to="360 20 20" dur="0.5s" repeatCount="indefinite" />
</path>
</svg>
</div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoicnNiYXVtYW5uIiwiYSI6ImNqNmhkZnhkZDA4M3Yyd3AwZDR4cmdhcDIifQ.TGKKAC6pPP0L-uMDJ5xFAA';
var bounds = [
[-75.04728500751165, 39.68392799015035],
[-72.91058699000139, 41.87764500765852]
];
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/dark-v9',
center: [-74.0059, 40.7128],
zoom: 10,
minZoom: 9,
maxZoom: 18,
pitch: 40,
maxBounds: bounds
});
function init() {
map.addSource('veh-incidents-1', {
type: 'geojson',
data: 'https://dl.dropbox.com/s/z4hajzr32e59kv4/nyc_pedcyc_collisions_1.geojson?dl=0',
buffer: 0,
maxzoom: 12
});
map.addSource('veh-incidents-2', {
type: 'geojson',
data: 'https://dl.dropbox.com/s/prxhl4whif6tstt/nyc_pedcyc_collisions_2.geojson?dl=0',
buffer: 0,
maxzoom: 12
});
if (window.location.search.indexOf('embed') !== -1) map.scrollZoom.disable();
map.addLayer({
'id': 'veh-incd-1',
'type': 'circle',
'source': 'veh-incidents-1',
'paint': {
'circle-color': {
property: 'CYC_INJ',
type: 'interval',
stops: [
[1, 'orange'],
[2, 'red']
]
},
'circle-radius': {
property: 'CYC_INJ',
base: 3,
type: 'interval',
stops: [
[1, 3],
[2, 8],
[3, 12]
]
},
'circle-opacity': 0.8,
'circle-blur': 0.5
},
'filter': ['>=', 'CYC_INJ', 1]
}, 'waterway-label');
map.addLayer({
'id': 'veh-incd-2',
'type': 'circle',
'source': 'veh-incidents-2',
'paint': {
'circle-color': {
property: 'CYC_INJ',
type: 'interval',
stops: [
[1, 'orange'],
[2, 'red']
]
},
'circle-radius': {
property: 'CYC_INJ',
base: 3,
type: 'interval',
stops: [
[1, 3],
[2, 8],
[3, 12]
]
},
'circle-opacity': 0.8,
'circle-blur': 0.5
},
'filter': ['>=', 'CYC_INJ', 1]
}, 'waterway-label');
map.addLayer({
'id': 'veh-incd-base-1',
'type': 'circle',
'source': 'veh-incidents-1',
'paint': {
'circle-color': 'yellow',
'circle-radius': 3,
'circle-opacity': 0.3,
'circle-blur': 1
},
'filter': ['<', 'CYC_INJ', 1]
}, 'waterway-label');
map.addLayer({
'id': 'veh-incd-base-2',
'type': 'circle',
'source': 'veh-incidents-2',
'paint': {
'circle-color': 'yellow',
'circle-radius': 3,
'circle-opacity': 0.3,
'circle-blur': 1
},
'filter': ['<', 'CYC_INJ', 1]
}, 'waterway-label');
};
map.once('style.load', function(e) {
init();
map.addControl(new mapboxgl.NavigationControl());
map.on('click', function(e) {
var features = map.queryRenderedFeatures(e.point, {
layers: ['veh-incd-1', 'veh-incd-2']
});
if (!features.length) {
return;
}
var feature = features[0];
var popup = new mapboxgl.Popup()
.setLngLat(map.unproject(e.point))
.setHTML('<h3>Collision Detail</h3>' +
'<ul>' +
'<li>Year: <b>' + feature.properties.YEAR + '</b></li>' +
'<li>Pedestrian Injuries: <b>' + feature.properties.PED_INJ + '</b></li>' +
'<li>Pedestrian Fatalities: <b>' + feature.properties.PED_KIL + '</b></li>' +
'<li>Cyclist Injuries: <b>' + feature.properties.CYC_INJ + '</b></li>' +
'<li>Cyclist Fatalities: <b>' + feature.properties.CYC_KIL + '</b></li>' +
'</ul>')
.addTo(map);
});
//Hide loading bar once tiles from geojson are loaded
map.on('data', function(e) {
if (e.dataType === 'source' && e.sourceId === 'veh-incidents-1') {
document.getElementById("loader").style.visibility = "hidden";
}
})
// Use the same approach as above to indicate that the symbols are clickable
// by changing the cursor style to 'pointer'.
map.on('mousemove', function(e) {
var features = map.queryRenderedFeatures(e.point, {
layers: ['veh-incd-1', 'veh-incd-2']
});
map.getCanvas().style.cursor = (features.length) ? 'pointer' : '';
});
var prop = document.getElementById('prop');
prop.addEventListener('change', function() {
map.setPaintProperty('veh-incd-1', 'circle-color', {
property: prop.value,
type: 'interval',
stops: [
[1, 'orange'],
[2, 'red']
]
});
map.setPaintProperty('veh-incd-2', 'circle-color', {
property: prop.value,
type: 'interval',
stops: [
[1, 'orange'],
[2, 'red']
]
});
map.setPaintProperty('veh-incd-1', 'circle-radius', {
property: prop.value,
base: 3,
type: 'interval',
stops: [
[1, 3],
[2, 6],
[3, 9]
]
});
map.setPaintProperty('veh-incd-2', 'circle-radius', {
property: prop.value,
base: 3,
type: 'interval',
stops: [
[1, 3],
[2, 6],
[3, 9]
]
});
map.setFilter('veh-incd-1', ['>=', prop.value, 1])
map.setFilter('veh-incd-2', ['>=', prop.value, 1])
});
});
</script>
</body>
</html>
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