I would like to display data from the Paris Open data (https://opendata.paris.fr/) on a dynamically generated Open Street map, on my website.
I would be interested in having several customisable fields (used in refine), such as:
The typical representation I would like to generate is dots based on the geolocalisation of the event (fields coordonnes or longitude and latitude) such as here:
https://www.onisr.securite-routiere.gouv.fr/cartographie-des-accidents-metropole-dom-tom
Can you please help me?
Here were I am at 04.11.2023:
I am using this code to display markers:
<html><body>
<div id="mapdiv"></div>
<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
<script>
map = new OpenLayers.Map("mapdiv");
map.addLayer(new OpenLayers.Layer.OSM());
var lonLat = new OpenLayers.LonLat(2.335867, 48.862943)
.transform(
new OpenLayers.Projection("EPSG:4326"), // transform from WGS 1984
map.getProjectionObject() // to Spherical Mercator Projection
);
var zoom=16;
var markers = new OpenLayers.Layer.Markers( "Markers" );
map.addLayer(markers);
markers.addMarker(new OpenLayers.Marker(lonLat));
map.setCenter (lonLat, zoom);
</script>
</body></html>
How can I add as markers the ones retrieved from: https://opendata.paris.fr/api/explore/v2.1/catalog/datasets/accidentologie0/records?limit=20 ?
I could solve my issue with the following code:
<!DOCTYPE html>
<html lang="fr">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>OpenStreetMap</title>
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css" integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ==" crossorigin=""/>
<!-- CSS -->
<style>
body{
margin:0
}
#maCarte{
height: 100vh;
}
</style>
</head>
<body>
<div id="maCarte"></div>
<!-- Fichiers Javascript -->
<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js" integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og==" crossorigin=""></script>
<script>
// On initialise la carte
var carte = L.map('maCarte').setView([48.825487, 2.338575], 15);
// On charge les "tuiles"
L.tileLayer('https://{s}.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png', {
// Il est toujours bien de laisser le lien vers la source des données
attribution: 'données © <a href="//osm.org/copyright">OpenStreetMap</a>/ODbL - rendu <a href="//openstreetmap.fr">OSM France</a>',
minZoom: 1,
maxZoom: 20
}).addTo(carte);
var mortIcon = L.icon({
iconUrl: 'mort_dot.png',
iconSize: [20, 20],
shadowSize: [20, 20],
shadowAnchor: [22, 94]
});
var legerIcon = L.icon({
iconUrl: 'leger_dot.png',
iconSize: [20, 20],
shadowSize: [20, 20],
shadowAnchor: [22, 94]
});
var graveIcon = L.icon({
iconUrl: 'grave_dot.png',
iconSize: [20, 20],
shadowSize: [20, 20],
shadowAnchor: [22, 94]
});
var inconnuIcon = L.icon({
iconUrl: 'inconnu_dot.png',
iconSize: [20, 20],
shadowSize: [20, 20],
shadowAnchor: [22, 94]
});
let xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = () => {
// La transaction est terminée ?
if(xmlhttp.readyState == 4){
// Si la transaction est un succès
if(xmlhttp.status == 200){
// On traite les données reçues
let donnees = JSON.parse(xmlhttp.responseText)
// On boucle sur les données (ES8)
Object.entries(donnees.results).forEach(results => {
let marker
switch (results[1].gravite) {
case 'Blessé léger':
marker = L.marker([results[1].latitude, results[1].longitude], {icon: legerIcon}).addTo(carte);
break;
case 'Blessé hospitalisé':
marker = L.marker([results[1].latitude, results[1].longitude], {icon: graveIcon}).addTo(carte);
break;
case 'Tué':
marker = L.marker([results[1].latitude, results[1].longitude], {icon: mortIcon}).addTo(carte);
break;
default:
marker = L.marker([results[1].latitude, results[1].longitude], {icon: inconnuIcon}).addTo(carte);
}
let categorie_victime
if (results[1].categorie == results[1].victime_type) {
categorie_victime = results[1].categorie
} else {
categorie_victime = results[1].categorie + " " + results[1].victime_type
}
marker.bindPopup("<b>" + results[1].annee + "</b> : " + categorie_victime + ", " + results[1].age + " ans (" + results[1].idusager + ")")
})
} else {
console.log(xmlhttp.statusText);
}
}
}
xmlhttp.open("GET", "https://opendata.paris.fr/api/explore/v2.1/catalog/datasets/accidentologie0/records?refine=iris%3A%22Parc%20de%20Montsouris%201%22&refine=iris%3A%22Parc%20de%20Montsouris%202%22&refine=iris%3A%22Parc%20de%20Montsouris%203%22&refine=iris%3A%22Parc%20de%20Montsouris%204%22&refine=iris%3A%22Parc%20de%20Montsouris%205%22&refine=iris%3A%22Parc%20de%20Montsouris%206%22&refine=iris%3A%22Parc%20de%20Montsouris%207%22&refine=pim_bp%3A%22Paris%20Intra%20Muros%22&limit=100");
// &refine=pim_bp%3A%22Paris%20Intra%20Muros%22 //
xmlhttp.send(null);
</script>
Thank you to the example on: https://nouvelle-techno.fr/articles/openstreetmap-inserer-des-marqueurs-depuis-une-base-de-donnees