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index.html
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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<title>Biggest Earthquake in the past week</title>
<style>
html,
body,
#viewDiv {
font-family: "Avenir Next W00","Helvetica Neue",Helvetica,Arial,sans-serif;
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
#titleDiv {
position: absolute;
top: 15px;
right: 15px;
background: rgba(36, 36, 36, .65);
backdrop-filter: blur(5px);
padding: 10px;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}
#titleSpan {
color: white;
font-size: 2rem;
}
#loadingDiv {
top: 0;
width: 100%;
height: 100%;
background: rgba(36, 36, 36, .65);
backdrop-filter: blur(5px);
display: flex;
justify-content: center;
align-items: center;
position: absolute;
}
#loadingSpan {
color: white;
font-size: 2rem;
}
.esri-time-slider {
left: 0;
right: 0;
bottom: 15px;
}
</style>
<link
rel="stylesheet"
href="https://js.arcgis.com/4.12/esri/themes/dark/main.css"
/>
<script>var dojoConfig = { has: { "esri-workers-for-memory-layers": 1 } };</script>
<script src="https://js.arcgis.com/4.12/"></script>
<script>
require([
"esri/request",
"esri/TimeExtent",
"esri/WebScene",
"esri/layers/GeoJSONLayer",
"esri/layers/FeatureLayer",
"esri/views/SceneView",
"esri/widgets/Zoom",
"esri/widgets/TimeSlider",
"esri/widgets/Expand",
"esri/widgets/Bookmarks"
], function(esriRequest, TimeExtent, WebScene, GeoJSONLayer, FeatureLayer, SceneView, Zoom, TimeSlider, Expand, Bookmarks) {
(async () => {
// If GeoJSON files are not on the same domain as your website, a CORS enabled server
// or a proxy is required.
const url =
"https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson";
const renderer = {
type: "simple",
field: "mag",
symbol: {
type: "simple-marker",
color: "orange",
outline: { color: "white" }
},
visualVariables: [
{
type: "size",
field: "mag",
stops: [
{
value: 2,
size: "1.5625px"
},
{
value: 3,
size: "3.125px"
},
{
value: 4,
size: "6.25px"
},
{
value: 5,
size: "12.5px"
},
{
value: 6,
size: "25px"
},
{
value: 7,
size: "50px"
},
{
value: 8,
size: "100px"
},
{
value: 9,
size: "200px"
}
]
}
]
};
const layer = new GeoJSONLayer({
url,
title: "USGS Earthquakes",
copyright: "USGS",
renderer,
definitionExpression: "type = 'earthquake' and mag > 0",
spatialReference: { wkid: 3857 },
fields: [
{ name: "mag", type: "double" },
{ name: "time", type: "date" },
{ name: "type", type: "string" },
{ name: "detail", type: "string" }
],
elevationInfo: {
mode: "absolute-height",
unit: "kilometers",
featureExpressionInfo: {
expression: "Geometry($feature).z * -1"
}
},
timeInfo: {
startField: "time"
}
});
// Query for the earthquakes ordered by magnitude.
// This will give us the last earthquake in the last week
const { features: [lastBigEarthquake] } = await layer.queryFeatures({
orderByFields: ["mag DESC", "time DESC"],
returnGeometry: true
});
// - Get a 50 kilometers buffer for the clipping area
// - Query for all the earthquakes in a 50 kms radius
const [{ extent }, { features: nearbyEarthquakes }] = await Promise.all([
layer.queryExtent({
geometry: lastBigEarthquake.geometry,
distance: 50,
units: "kilometers"
}),
layer.queryFeatures({
geometry: lastBigEarthquake.geometry,
distance: 20,
units: "kilometers"
})
]);
// Get the full time extent for those nearby earthquakes
const fullTimeExtent = new TimeExtent(nearbyEarthquakes.reduce(
(timeExtent, feature) => ({
start: Math.min(timeExtent.start, feature.attributes.time),
end: Math.max(timeExtent.end, feature.attributes.time),
}),
{ start: Number.POSITIVE_INFINITY, end: Number.NEGATIVE_INFINITY }
));
// see 12 hours of data around the earthquake
const timeExtent = new TimeExtent({
start: new Date(lastBigEarthquake.attributes.time - 6 * 60 * 60 * 1000),
end: new Date(lastBigEarthquake.attributes.time + 6 * 60 * 60 * 1000),
})
const scene = new WebScene({
basemap: "satellite",
layers: [layer],
ground: "world-elevation"
});
scene.ground.opacity = 0.5;
scene.ground.navigationConstraint = {
type: "none"
};
const view = new SceneView({
container: "viewDiv",
map: scene,
qualityProfile: "low",
viewingMode: "local",
extent,
clippingArea: extent,
environment: {
atmosphereEnabled: false,
starsEnabled: false,
background: {
type: "color",
color: "black"
}
},
popup: null,
highlightOptions: {
fillOpacity: 0,
color: "red"
},
ui: {
padding: {
top: 80,
right: 300
},
components: ["attribution"]
},
});
const zoom = new Zoom({ view, layout: "horizontal" });
view.ui.add(zoom, "bottom-left");
layer.labelingInfo = [
{
// When using callouts on labels, "above-center" is the only allowed position
where: `mag = ${lastBigEarthquake.attributes.mag}`,
labelPlacement: "above-center",
labelExpressionInfo: {
value: "Magnitude {mag}"
},
symbol: {
type: "text",
haloColor: "red",
haloSize: "2px",
color: "orange",
font: {
size: 20
}
}
}
];
const { data: detail } = await esriRequest(lastBigEarthquake.attributes.detail);
document.getElementById("titleSpan").innerText = detail.properties.title;
document.getElementById("titleSpan").href = detail.properties.url;
await view.whenLayerView(layer);
await view.goTo({
target: nearbyEarthquakes,
tilt: 120,
heading: 45
}, { animate: false });
document.getElementById("loadingDiv").remove();
view.whenLayerView(layer).then((layerView) => {
layerView.highlight(lastBigEarthquake);
const timeSlider = new TimeSlider({
view,
mode: "time-window",
playRate: 64,
stops: {
interval: {
value: 1,
unit: "hours"
},
},
values: [timeExtent.start, timeExtent.end],
fullTimeExtent
});
view.ui.add(timeSlider, "manual");
});
let layers = await Promise.all([loadContours(detail), loadNearbyCities(detail)]);
layers = layers.filter(layer => !!layer);
scene.addMany(layers);
})();
async function loadContours(earthquakeDetails) {
if (!earthquakeDetails.properties.products.shakemap) {
return null;
}
function createSymbol(height, color) {
return {
type: "line-3d",
symbolLayers: [
{
type: "path",
profile: "quad",
material: {
color
},
width: 10,
height,
join: "round",
cap: "round",
anchor: "bottom",
profileRotation: "heading"
}
]
};
}
return new GeoJSONLayer({
url: earthquakeDetails.properties.products.shakemap[0].contents["download/cont_mi.json"].url,
renderer: {
type: "unique-value",
field: "value",
uniqueValueInfos: [
{ value: 1, symbol: createSymbol(Math.exp(1), "white") },
{ value: 2, symbol: createSymbol(Math.exp(2), "#bfccff") },
{ value: 2.5, symbol: createSymbol(Math.exp(2.5), "#b0d9ff") },
{ value: 3, symbol: createSymbol(Math.exp(3), "#a0e6ff") },
{ value: 3.5, symbol: createSymbol(Math.exp(3.5), "#90f3ff") },
{ value: 4, symbol: createSymbol(Math.exp(4), "#80ffff") },
{ value: 4.5, symbol: createSymbol(Math.exp(4.5), "#7dffc9") },
{ value: 5, symbol: createSymbol(Math.exp(5), "#7aff93") },
{ value: 5.5, symbol: createSymbol(Math.exp(5.5), "#bdff4a") },
{ value: 6, symbol: createSymbol(Math.exp(6), "#ffff00") },
{ value: 6.5, symbol: createSymbol(Math.exp(6.5), "#ffe300") },
{ value: 7, symbol: createSymbol(Math.exp(7), "#ffc800") },
{ value: 7.5, symbol: createSymbol(Math.exp(7.5), "#ffad00") },
{ value: 8, symbol: createSymbol(Math.exp(8), "#ff9100") },
{ value: 8.5, symbol: createSymbol(Math.exp(8.5), "#ff4900") },
{ value: 9, symbol: createSymbol(Math.exp(9), "#ff0000") }
]
}
});
}
async function loadNearbyCities(earthquakeDetails) {
if (!earthquakeDetails.properties.products["nearby-cities"]) {
return null;
}
const { data: nearbyCities } = await esriRequest(earthquakeDetails.properties.products["nearby-cities"][0].contents["nearby-cities.json"].url, {
responseType: "json"
});
return new FeatureLayer({
objectIdField: "OBJECTID",
fields: [
{ name: "direction", type: "string" },
{ name: "distance", type: "double" },
{ name: "name", type: "string" },
],
source: nearbyCities.map(({ name, longitude, latitude, distance, direction }) => ({
geometry: {
type: "point",
longitude,
latitude
},
attributes: {
name,
distance,
direction
}
})),
renderer: {
type: "simple",
symbol: {
type: "point-3d",
symbolLayers: [
{
type: "icon",
resource: {
primitive: "circle"
},
material: {
color: "black"
},
size: 4
}
]
}
},
labelingInfo: [
{
labelPlacement: "above-center",
labelExpressionInfo: {
value: "{name} - {distance}kms"
},
symbol: {
type: "label-3d",
symbolLayers: [
{
type: "text",
material: {
color: "white"
},
halo: {
color: "black",
size: 2
},
size: 16
}
],
verticalOffset: {
screenLength: 300,
maxWorldLength: 20000,
minWorldLength: 8000
},
callout: {
type: "line",
size: 0.5,
color: [0, 0, 0],
border: {
color: [255, 255, 255, 0.7]
}
}
}
}
]
});
}
});
</script>
</head>
<body>
<div id="viewDiv"></div>
<div id="titleDiv"><a id="titleSpan" target="_blank"></a></div>
<div id="loadingDiv"><span id="loadingSpan">Fetching the last earthquake data...</span></div>
</body>
</html>