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Leaflet with a GeoJSON layer
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<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<title>A basic map with Leaflet</title>
<!--add Leaflet CSS-->
<link rel="stylesheet" href=""
<!--our own style rules-->
<style type="text/css">
body, html {
height: 90%;
#map-container {
height: 100%;
<!--The div in which the map will be created-->
<div id="map-container"></div>
<!--load leaflet.js-->
<script src=""
<!--our own code to create the map-->
let map ='map-container');
map.setView([52.268, 4.998], 7);
let bglayer_Positron = L.tileLayer('https://cartodb-basemaps-{s}{z}/{x}/{y}.png', {
attribution: '&copy; <a href="">OpenStreetMap</a> &copy; <a href="">CartoDB</a>',
subdomains: 'abcd',
maxZoom: 19
//define color of points based on earthquake type
function colorPoints(type){
return type === 'tec' ? '#35495D' :
type === 'ind' ? '#EA9657' :
//define how our point data will be visualized
function styleEarthquakePoints(feature){
return {
radius: 2.5*Math.sqrt((Math.exp(parseFloat(,
fillColor: colorPoints(,
color: '#fff',
weight: 1,
opacity: 0.8,
fillOpacity: 0.6
//create an empty geojson layer that already knows how to style the data
var geojson = L.geoJson(null,{
pointToLayer: function (feature, latlng) {
return L.circleMarker(latlng, styleEarthquakePoints(feature));
//define a function to get and parse geojson from URL
async function getGeoData(url) {
let response = await fetch(url);
let data = await response.json();
return data;
//fetch the geojson and add it to our geojson layer
getGeoData('aardbevingen_NL.geojson').then(data => geojson.addData(data));
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