/
population.html
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/
population.html
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.3/dist/leaflet.css"/>
<style>
#map {
bottom: 0;
left: 0;
position: absolute;
right: 0;
top: 0;
}
</style>
</head>
<body>
<div id="map"></div>
<script src="https://unpkg.com/leaflet@1.0.3/dist/leaflet.js"></script>
<script src="https://unpkg.com/georaster"></script>
<script src="https://unpkg.com/chroma-js"></script>
<script src="https://unpkg.com/georaster-layer-for-leaflet"></script>
<script>
// initalize leaflet map
var map = L.map('map').setView([42.358056, -71.063611], 10);
// add OpenStreetMap basemap
L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
attribution: '© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
var url_to_geotiff_file = "https://georaster-layer-for-leaflet.s3.amazonaws.com/GHS_POP_E2015_GLOBE_R2019A_4326_9ss_V1_0.tif";
parseGeoraster(url_to_geotiff_file).then(georaster => {
console.log("georaster:", georaster);
/*
GeoRasterLayer is an extension of GridLayer,
which means can use GridLayer options like opacity.
Just make sure to include the georaster option!
http://leafletjs.com/reference-1.2.0.html#gridlayer
*/
var scale = chroma.scale(['brown', 'orange', 'red']).domain([0,100,1000]);
var layer = new GeoRasterLayer({
attribution: "European Commission: Global Human Settlement",
georaster: georaster,
opacity: 0.75,
resolution: 64,
pixelValuesToColorFn: function (values) {
var population = values[0];
if (population === -200) return;
if (population < 0) return;
return scale(population).hex();
}
});
layer.addTo(map);
});
</script>
</body>
</html>