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Google Maps and deck.gl GeoJsonLayer

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Page Summary

This example demonstrates visualizing a large number of data points, specifically earthquake locations, on a Google Map using deck.gl's GeoJsonLayer and ScatterplotOverlay.
It fetches earthquake data from a USGS GeoJSON feed and dynamically renders points on the map, scaling their size based on magnitude.
The visualization utilizes deck.gl transitions for a smooth, animated appearance of data points.
The code provides both TypeScript and JavaScript implementations, offering flexibility for developers.
Users can interact with the visualization through a live demo on JSFiddle or explore the source code via provided links.

Visualize thousands of points

This example visualizes recent earthquakes using the deck.gl GeoJsonLayer and a ScatterPlot of earthquakes.

For more information, see https://deck.gl/.

[フレーム]

TypeScript

// Import the needed libraries.
import{GoogleMapsOverlay}from'@deck.gl/google-maps';
import{GeoJsonLayer}from'@deck.gl/layers';
import{Feature}from'geojson';
constmapElement=document.querySelector('gmp-map')!;
letinnerMap:google.maps.Map;
interfaceEarthquakeProperties{
mag:number;
place:string;
time:number;
}
/**
 * Validates that a feature has the properties we need for rendering.
 */
functionisEarthquake(
f:Feature
):fisFeature & {properties:EarthquakeProperties}{
return(
f.properties!==null&&
typeoff.properties==='object'&&
// eslint-disable-next-line @typescript-eslint/no-explicit-any
typeof(f.propertiesasany).mag==='number'
);
}
// Initialize and add the map
asyncfunctioninit(){
// Request the needed libraries.
awaitgoogle.maps.importLibrary('maps');
innerMap=mapElement.innerMap;
constdeckOverlay=newGoogleMapsOverlay({
layers:[
newGeoJsonLayer({
id:'earthquakes',
data:'https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson',
filled:true,
pointRadiusMinPixels:2,
pointRadiusMaxPixels:200,
opacity:0.4,
pointRadiusScale:0.3,
getPointRadius:(f:Feature):number=>{
if(isEarthquake(f)){
returnMath.pow(10,f.properties.mag);
}
return0;// Fallback for invalid data.
},
getFillColor:():[number,number,number,number]=>{
return[255,70,30,180];// Default color for other earthquakes.
},
autoHighlight:true,
transitions:{
getPointRadius:{
type:'spring',
stiffness:0.1,
damping:0.15,
enter:()=>[0],// grow from size 0,
duration:10000,
},
},
onDataLoad:()=>{
console.log('Data is loaded.');
},
}),
],
});
deckOverlay.setMap(innerMap);
}
voidinit();index.ts

JavaScript

// Import the needed libraries.
import{GoogleMapsOverlay}from'@deck.gl/google-maps';
import{GeoJsonLayer}from'@deck.gl/layers';
constmapElement=document.querySelector('gmp-map');
letinnerMap;
/**
 * Validates that a feature has the properties we need for rendering.
 */
functionisEarthquake(f){
return(
f.properties!==null&&
typeoff.properties==='object'&&
typeoff.properties.mag==='number'
);
}
// Initialize and add the map
asyncfunctioninit(){
// Request the needed libraries.
awaitgoogle.maps.importLibrary('maps');
innerMap=mapElement.innerMap;
constdeckOverlay=newGoogleMapsOverlay({
layers:[
newGeoJsonLayer({
id:'earthquakes',
data:'https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson',
filled:true,
pointRadiusMinPixels:2,
pointRadiusMaxPixels:200,
opacity:0.4,
pointRadiusScale:0.3,
getPointRadius:(f)=>{
if(isEarthquake(f)){
returnMath.pow(10,f.properties.mag);
}
return0;// Fallback for invalid data.
},
getFillColor:()=>{
return[255,70,30,180];// Default color for other earthquakes.
},
autoHighlight:true,
transitions:{
getPointRadius:{
type:'spring',
stiffness:0.1,
damping:0.15,
enter:()=>[0],// grow from size 0,
duration:10000,
},
},
onDataLoad:()=>{
console.log('Data is loaded.');
},
}),
],
});
deckOverlay.setMap(innerMap);
}
voidinit();index.js

CSS

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body{
height:100%;
margin:0;
padding:0;
}
style.css

HTML

<html>
 <head>
 <title>deck.gl and Google Maps Platform</title>
 <link rel="stylesheet" type="text/css" href="./style.css" />
 <script type="module" src="./index.js"></script>
 <script>
 // prettier-ignore
 (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
 key: "GOOGLE_MAPS_API_KEY"
 });
 </script>
 </head>
 <body>
 <gmp-map center="40, -110" zoom="4" map-id="DEMO_MAP_ID"></gmp-map>
 </body>
</html>index.html

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

gitclonehttps://github.com/googlemaps-samples/js-api-samples.git
cdsamples/deckgl-points
npmi
npmstart