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pop_density.html
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pop_density.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Interactive Web Mapping</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.5.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.5.0/mapbox-gl.js"></script>
<style>
h2,
h3 {
margin: 10px;
font-size: 18px;
}
h3 {
font-size: 16px;
}
p {
margin: 10px;
}
/**
* Create a position for the map
* on the page */
#map {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
width: 100%;
height: 100%;
}
/**
* Set rules for how the map overlays
* (information box and legend) will be displayed
on the page. */
.map-overlay {
position: absolute;
bottom: 0;
left: 0;
background: rgba(255, 255, 255, 0.8);
border-style: solid;
border-width: 1px;
border-color: rgba(0, 0, 0, 0.2);
margin-left: 20px;
font-family: Arial, sans-serif;
overflow: auto;
border-radius: 3px;
}
#features {
top: 0;
height: 100px;
margin-top: 20px;
width: 250px;
}
#legend {
padding: 10px;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
line-height: 18px;
height: 210px;
margin-bottom: 40px;
width: 150px;
}
.legend-key {
display: inline-block;
border-radius: 20%;
width: 10px;
height: 10px;
margin-right: 5px;
}
.mapboxgl-canvas-container.mapboxgl-interactive,
.mapboxgl-ctrl-group button.mapboxgl-ctrl-compass {
cursor: unset;
}
</style>
</head>
<body>
<div id="map"></div>
<div class='map-overlay' id='features'>
<h2>US population density</h2>
<div id='text-escription'>
<p>Hover over a state!</p>
</div>
</div>
<div class='map-overlay' id='legend'></div>
<script>
// initialize basemmap
mapboxgl.accessToken =
'pk.eyJ1IjoiamFrb2J6aGFvIiwiYSI6ImNpcms2YWsyMzAwMmtmbG5icTFxZ3ZkdncifQ.P9MBej1xacybKcDN_jehvw';
const map = new mapboxgl.Map({
container: 'map', // container ID
style: 'mapbox://styles/mapbox/light-v10', // style URL
zoom: 3, // starting zoom
center: [-100, 40] // starting center
});
// load data and add as layer
async function geojsonFetch() {
let response = await fetch('assets/stateData.geojson');
let stateData = await response.json();
map.on('load', function loadingData() {
map.addSource('stateData', {
type: 'geojson',
data: stateData
});
map.addLayer({
'id': 'stateData-layer',
'type': 'fill',
'source': 'stateData',
'paint': {
'fill-color': [
'step',
['get', 'density'],
'#FFEDA0', // stop_output_0
10, // stop_input_0
'#FED976', // stop_output_1
20, // stop_input_1
'#FEB24C', // stop_output_2
50, // stop_input_2
'#FD8D3C', // stop_output_3
100, // stop_input_3
'#FC4E2A', // stop_output_4
200, // stop_input_4
'#E31A1C', // stop_output_5
500, // stop_input_5
'#BD0026', // stop_output_6
1000, // stop_input_6
"#800026" // stop_output_7
],
'fill-outline-color': '#BBBBBB'
}
});
const layers = [
'0-9.99',
'10-19.99',
'20-49.99',
'50-100.99',
'100-199.99',
'200-499.99',
'500-999.99',
'1000 and more'
];
const colors = [
'#FFEDA0',
'#FED976',
'#FEB24C',
'#FD8D3C',
'#FC4E2A',
'#E31A1C',
'#BD0026',
'#800026'
];
// create legend
const legend = document.getElementById('legend');
legend.innerHTML = "<b>Population Density<br>(people/sq.mi.)</b><br><br>";
layers.forEach((layer, i) => {
const color = colors[i];
const item = document.createElement('div');
const key = document.createElement('span');
key.className = 'legend-key';
key.style.backgroundColor = color;
const value = document.createElement('span');
value.innerHTML = `${layer}`;
item.appendChild(key);
item.appendChild(value);
legend.appendChild(item);
});
});
map.on('mousemove', ({point}) => {
const states = map.queryRenderedFeatures(point, {
layers: ['stateData-layer']
});
document.getElementById('text-escription').innerHTML = states.length ?
`<h3>${states[0].properties.name}</h3><p><strong><em>${states[0].properties.density}</strong> people per square mile</em></p>` :
`<p>Hover over a state!</p>`;
});
}
geojsonFetch();
</script>
</body>
</html>