Page Summary
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This example visualizes curved connections between Prague and major airports worldwide using the
ArcLayerfrom deck.gl. -
The
ArcLayeris rendered on top of a Google Map, displaying flight paths originating from Prague. -
The code utilizes GeoJSON data of airports and filters them based on a scalerank property for visualization.
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You can interact with a live version of this example on JSFiddle or clone the sample code for local execution.
Visualize points with arcs
This example uses arcs to show curved point-to-point connections between
airports and the city of Prague. The ArcLayer
renders raised arcs joining pairs of source and target points.
TypeScript
import { GoogleMapsOverlay } from '@deck.gl/google-maps' ; import { ArcLayer } from '@deck.gl/layers' ; import type * as GeoJSON from 'geojson' ; type Properties = { scalerank : number }; type Feature = GeoJSON . Feature<GeoJSON . Point , Properties > ; type Data = GeoJSON . FeatureCollection<GeoJSON . Point , Properties > ; async function initMap () { // Request needed libraries. ( await google . maps . importLibrary ( 'maps' )) as google . maps . MapsLibrary ; // Get the gmp-map element. const mapElement = document . querySelector ( 'gmp-map' ) as google . maps . MapElement ; // Get the inner map. const innerMap = mapElement . innerMap ; innerMap . setTilt ( 30 ); // Set tilt after map initialization. // Set the path to the GeoJSON data file. const dataUrl = new URL ( './public/ne_10m_airports.geojson' , import . meta . url ). toString (); const flightsLayer = new ArcLayer<Feature> ({ id : 'flights' , data : dataUrl , dataTransform : ( data : any ) = > data . features . filter (( f : any ) = > f . properties . scalerank < 4 ), getSourcePosition : () = > [ 14.42076 , 50.08804 ], // Prague getTargetPosition : ( f : Feature ) = > f . geometry . coordinates as [ number , number ], getSourceColor : [ 0 , 128 , 200 ], getTargetColor : [ 0 , 0 , 80 ], getWidth : 1 , }); const overlay = new GoogleMapsOverlay ({ interleaved : false , layers : [ flightsLayer ], }); overlay . setMap ( innerMap ); } initMap ();
JavaScript
import { GoogleMapsOverlay } from '@deck.gl/google-maps' ; import { ArcLayer } from '@deck.gl/layers' ; async function initMap () { // Request needed libraries. ( await google . maps . importLibrary ( 'maps' )); // Get the gmp-map element. const mapElement = document . querySelector ( 'gmp-map' ); // Get the inner map. const innerMap = mapElement . innerMap ; innerMap . setTilt ( 30 ); // Set tilt after map initialization. // Set the path to the GeoJSON data file. const dataUrl = new URL ( './public/ne_10m_airports.geojson' , import . meta . url ). toString (); const flightsLayer = new ArcLayer ({ id : 'flights' , data : dataUrl , dataTransform : ( data ) = > data . features . filter (( f ) = > f . properties . scalerank < 4 ), getSourcePosition : () = > [ 14.42076 , 50.08804 ], // Prague getTargetPosition : ( f ) = > f . geometry . coordinates , getSourceColor : [ 0 , 128 , 200 ], getTargetColor : [ 0 , 0 , 80 ], getWidth : 1 , }); const overlay = new GoogleMapsOverlay ({ interleaved : false , layers : [ flightsLayer ], }); overlay . setMap ( innerMap ); } initMap ();
CSS
/* * Always set the map height explicitly to define the size of the div element * that contains the map. */ # map { height : 100 % ; } /* * Optional: Makes the sample page fill the window. */ html , body { height : 100 % ; margin : 0 ; padding : 0 ; }
HTML
<html> <head> <title>deck.gl ArcLayer</title> <link rel="stylesheet" type="text/css" href="./style.css" /> <script type="module" src="./index.js"></script> <!-- prettier-ignore --> <script>(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: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly" });</script> </head> <body> <gmp-map center="50,14" map-id="90f87356969d889c" zoom="3"></gmp-map> </body> </html>
Try Sample
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.
git clone https : //github.com/googlemaps-samples/js-api-samples.gitcd samples / deckgl - arclayernpm inpm start
