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Created October 13, 2019 05:33
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minimal Overpass Leaflet example
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<title>Example: Overpass-API with Leaflet.js</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css" />
<style>
body {
padding: 0;
margin: 0;
}
html, body, #map {
height: 100%;
width: 100%;
}
#overpass-api-controls {
padding: 10px;
background-color: rgb(255, 255, 255);
}
#overpass-api-controls a {
display: inline;
}
</style>
</head>
<body>
<div id="map">
<div class="leaflet-control-container">
<div class="leaflet-top leaflet-right">
<div id="overpass-api-controls" class="leaflet-bar leaflet-control">
<input id="query-textfield" value="leisure=playground" size="50">
<input id="query-button" type="button" value="Laden">
</div>
</div>
</div>
</div>
<script src="https://unpkg.com/[email protected]/dist/leaflet.js"></script>
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script src="https://unpkg.com/[email protected]/osmtogeojson.js"></script>
<script>
var map = L.map('map').setView([53.079, 8.81308], 14);
L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
maxZoom: 18,
attribution: 'Map data &copy; <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors</a>'
}).addTo(map);
function buildOverpassApiUrl(map, overpassQuery) {
var bounds = map.getBounds().getSouth() + ',' + map.getBounds().getWest() + ',' + map.getBounds().getNorth() + ',' + map.getBounds().getEast();
var nodeQuery = 'node[' + overpassQuery + '](' + bounds + ');';
var wayQuery = 'way[' + overpassQuery + '](' + bounds + ');';
var relationQuery = 'relation[' + overpassQuery + '](' + bounds + ');';
var query = '?data=[out:json][timeout:15];(' + nodeQuery + wayQuery + relationQuery + ');out body geom;';
var baseUrl = 'http://overpass-api.de/api/interpreter';
var resultUrl = baseUrl + query;
return resultUrl;
}
$("#query-button").click(function () {
var queryTextfieldValue = $("#query-textfield").val();
var overpassApiUrl = buildOverpassApiUrl(map, queryTextfieldValue);
$.get(overpassApiUrl, function (osmDataAsJson) {
var resultAsGeojson = osmtogeojson(osmDataAsJson);
var resultLayer = L.geoJson(resultAsGeojson, {
style: function (feature) {
return {color: "#ff0000"};
},
filter: function (feature, layer) {
var isPolygon = (feature.geometry) && (feature.geometry.type !== undefined) && (feature.geometry.type === "Polygon");
if (isPolygon) {
feature.geometry.type = "Point";
var polygonCenter = L.latLngBounds(feature.geometry.coordinates[0]).getCenter();
feature.geometry.coordinates = [ polygonCenter.lat, polygonCenter.lng ];
}
return true;
},
onEachFeature: function (feature, layer) {
var popupContent = "";
popupContent = popupContent + "<dt>@id</dt><dd>" + feature.properties.type + "/" + feature.properties.id + "</dd>";
var keys = Object.keys(feature.properties.tags);
keys.forEach(function (key) {
popupContent = popupContent + "<dt>" + key + "</dt><dd>" + feature.properties.tags[key] + "</dd>";
});
popupContent = popupContent + "</dl>"
layer.bindPopup(popupContent);
}
}).addTo(map);
});
});
</script>
</body>
</html>
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