I am trying to display open radioactivity data from the German Agency for Protection of Radiation (https://www.imis.bfs.de/geoportal/).
They have a nice GeoJson API.
I can display the individual markers (points of radioactivity sensors), but cannot display the value feature.properties.value in a popup.
I tried onEachFeature but somehow it did not work. I searched for quite a bit, but could not find a solution
html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Radioaktivität</title>
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.7.1/dist/leaflet.css" />
<script src="https://unpkg.com/leaflet#1.7.1/dist/leaflet.js"></script>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="map"></div>
<script src="script.js"></script>
</body>
</html>
JavaScript:
let config = {
minZoom: 2,
maxZoom: 18,
};
const zoom = 7;
const lat = 51.7036;
const lng = 10.2166;
const map = L.map("map", config).setView([lat, lng], zoom);
let url = 'https://www.imis.bfs.de/ogc/opendata/ows?service=WFS&version=1.1.0&request=GetFeature&typeName=opendata:odlinfo_odl_1h_latest&outputFormat=application/json';
const response = fetch(url)
.then(response => response.json())
.then(response => {
L.geoJson(response, {
onEachFeature: function (feature, layer) {
layer.bindPopup(feature.properties.value);
}
}).addTo(map);
});
Related
I'm just trying to do a simple map using the Leaflet.js libraries directly instead of the python wrappers(ipyleaflet, folium) but I can't any map to display regardless of what I do. the map area is drawn the correct size with the zoom controls, as are the tile attributions, and a marker in the right location. I have tried multiple browsers and also in QWebEngineView as well as different tile sets. I've also tried both the hosted js and css scripts as well as local copies The results are the same. Everything with the same v1.7.1 release though.
Here is the html code:
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
<link rel="stylesheet" href="leaflet.css" />
<script src="leaflet.js"></script>
<!-- <link rel="stylesheet" href="https://unpkg.com/leaflet#1.7.1/dist/leaflet.css" integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A==" crossorigin="" />
<script src="https://unpkg.com/leaflet#1.7.1/dist/leaflet.js" integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA==" crossorigin=""></script>
-->
<style>
#map {
width: 900px;
height: 400px;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
var layer = L.tileLayer('https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}', {
attribution: 'Map data © OpenStreetMap contributors, Imagery © Mapbox',
maxZoom: 18,
id: 'mapbox/satellite-v9',
tileSize: 512,
zoomOffset: -1,
accessToken: 'your.mapbox.access.token'
});
var mymap = L.map('map', { preferCanvas: true, center: [43.08695, -73.75792], layers: [layer], zoom: 10 });
var mymarker = L.marker([43.08695, -73.75792], { draggable: true }).addTo(mymap)
</script>
</body>
</html
Here's a screenshot
Anybody got any ideas? This ought to be something really simple...
I'm using the French IGN Leaflet extension (which use Proj4Leaflet internally) to display maps with a different coordinates system (Lambert 93 and not WGS 84). I would like to know if there is a way to call setView, add a marker, ... using the same coordinates system that the one defined in the crs property (without to do the transformation manually) ?
Actually, I have the following code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>WebApplication1</title>
<base href="~/" />
<link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
<link rel="stylesheet" href="lib/leaflet/leaflet.css" />
<script type='text/javascript' src="lib/leaflet/leaflet.js"></script>
<link rel="stylesheet" href="lib/leaflet.geoportal/GpPluginLeaflet.css" />
<link rel="stylesheet" href="lib/leaflet.geoportal/GpPluginLeaflet-src.css" />
<link rel="stylesheet" href="lib/leaflet.geoportal/GpPluginLeaflet-map.css" />
<script type='text/javascript' src="lib/leaflet.geoportal/GpPluginLeaflet.js"></script>
<script type='text/javascript' src="lib/leaflet.geoportal/GpPluginLeaflet-src.js"></script>
<script type='text/javascript' src="lib/leaflet.geoportal/GpPluginLeaflet-map.js"></script>
</head>
<body>
<div id="map" style="padding:5px; width:100%;height:800px;"></div>
<script>
function go() {
var town1 = [48.845, 2.424];
var map = L.map('map', {
crs: L.geoportalCRS.EPSG2154,
}).setView(town1, 18);
var layer = L.geoportalLayer.WMTS({ layer: "ORTHOIMAGERY.ORTHOPHOTOS.BDORTHO.L93" });
layer.addTo(map);
map.addControl(L.geoportalControl.LayerSwitcher());
var town2= [46.7833300, 4.8500000];
#*var town2= [841126, 6633116];*#
var marker = L.marker(town2);
marker.addTo(map);
map.setView(town2, 18, L.geoportalCRS.EPSG2154);
}
Gp.Services.getConfig({ apiKey: "jhyvi0fgmnuxvfv0zjzorvdn", onSuccess: go });
</script>
</body>
</html>
But as you can see, the setView and the add of a marker is done using the WGS84 system coordinates. I would like to be able to do it using the same system that the one defined in crs.
I can transform the coordinates manually but I expected that Proj4Leaflet would do it automatically.
Could you tell me if there is a way to do it or not ?
I'm using Mapbox for maps, and the access token is public where people visit the website can easily copy. Is there a way to hide this access token or limit access to only my website? It seems other people are using my access code to do Python Requests for geocodes.
<!DOCTYPE html>
<html>
<head>
<title>Quick Start - Leaflet</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="shortcut icon" type="image/x-icon" href="docs/images/favicon.ico" />
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.3.1/dist/leaflet.css" integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ==" crossorigin=""/>
<script src="https://unpkg.com/leaflet#1.3.1/dist/leaflet.js" integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw==" crossorigin=""></script>
</head>
<body>
<div id="mapid" style="width: 600px; height: 400px;"></div>
<script>
var mymap = L.map('mapid').setView([51.505, -0.09], 13);
L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4NXVycTA2emYycXBndHRqcmZ3N3gifQ.rJcFIG214AriISLbB6B5aw', {
maxZoom: 18,
attribution: 'Map data © OpenStreetMap contributors, ' +
'CC-BY-SA, ' +
'Imagery © Mapbox',
id: 'mapbox.streets'
}).addTo(mymap);
L.marker([40.7127837, -74.0059413]).addTo(mymap)
.bindPopup("<b>Hello world!</b><br />I am a popup.").openPopup();
var popup = L.popup();
function onMapClick(e) {
L.marker([e.latlng.lat, e.latlng.lng]).addTo(mymap)
popup
.setLatLng(e.latlng)
.setContent("You clicked the map at " + e.latlng.toString())
.openOn(mymap);
}
mymap.on('click', onMapClick);
</script>
</body>
</html>
You could add URL restrictions to your access token:
https://docs.mapbox.com/help/account/tokens/#domain-restrictions
Or you could hide your token with a method like this:
https://www.quora.com/How-do-you-hide-your-API-customer-key-token-when-youre-pushing-code-to-Github
I hope that's helpful!
I updated leaflet elevation example gpx just changing the gox name, working locally on win 7 or OS X and Safari or Chrome. Nothing shows up.
var map = new L.Map('map');
var url = 'http://otile{s}.mqcdn.com/tiles/1.0.0/map/{z}/{x}/{y}.jpeg',
attr ='Tiles Courtesy of MapQuest — Map data © OpenStreetMap contributors, CC-BY-SA',
service = new L.TileLayer(url, {subdomains:"1234",attribution: attr});
var el = L.control.elevation();
el.addTo(map);
var g=new L.GPX("./maggiore.gpx", {
async: true,
marker_options: {
startIconUrl: './lib/leaflet-gpx/pin-icon-start.png',
endIconUrl: './lib/leaflet-gpx/pin-icon-end.png',
shadowUrl: './lib/leaflet-gpx/pin-shadow.png'
}
});
g.on('loaded', function(e) {
map.fitBounds(e.target.getBounds());
});
g.on("addline",function(e){
el.addData(e.line);
});
g.addTo(map);
map.addLayer(service);
<link href="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.css" rel="stylesheet"/>
<head>
<title>Leaflet.Elevation</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style>
html, body, #map {
height:100%;
width:100%;
padding:0px;
margin:0px;
}
</style>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.css" />
<!--[if lte IE 8]><link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.ie.css" /><![endif]-->
<link rel="stylesheet" href="../dist/Leaflet.Elevation-0.0.2.css" />
<script type="text/javascript" src="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.js"></script>
<script type="text/javascript" src="../dist/Leaflet.Elevation-0.0.2.min.js"></script
><script type="text/javascript" src="./lib/leaflet-gpx/gpx.js"></script>
</head>
<body>
<div id="map"></div>
All I get is a grey page with zoom control and an empty diagram
do you have the leaftlet.elevation dist files ?
looking at your example you have :
<link rel="stylesheet" href="../dist/Leaflet.Elevation-0.0.2.css" />
<script type="text/javascript" src="../dist/Leaflet.Elevation-0.0.2.min.js"></script
you may copy these files to the lib folder.
I built a heatmap on Leaflet.
My first goal is to see the heatmap when you open the map. The second goal is not to view the heatmap if the zoom level is greater than 9.
I tried this :
if (map.getZoom() >9 {
map.removeLayer (heatmapLayer);
};
But it did not work.
Would you have any suggestions ?
Thanks !
Here is the code :
<!DOCTYPE html>
<html lang="en">
<head>
<title>Application - version 1.0</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="">
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.6.3/leaflet.css" />
<link rel="stylesheet" href="style_p.css" />
<style type="text/css">
html, body, #map {
margin: 0;
margin-top: 0%;
width: 100%;
height: 100%;
};
</style>
</head>
<!-- Favicon -->
<link rel="icon" href="california.ico" />
<body>
<div id="map"></div>
<script src="http://cdn.leafletjs.com/leaflet-0.6.3/leaflet-src.js"></script>
<script src="http://maps.google.com/maps/api/js?v=3.2&sensor=false"></script>
<script src="jquery.js"></script>
<script type="text/javascript" src="heatmap.js"></script>
<script type="text/javascript" src="heatmap-leaflet.js"></script>
<script type="text/javascript" src="sloopjohnb.js"></script>
<script src="google.js"></script>
<script src="leaflet_search.js"></script>
<script type="text/javascript" charset="utf-8">
$(function() {
var osm = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
var base = new L.TileLayer('http://129.206.74.245:8001/tms_r.ashx?x={x}&y={y}&z={z}');
var ggl2 = new L.Google('SATELLITE');
var heatmapLayer;
heatmapLayer = L.TileLayer.heatMap({
radius: 10,
opacity: 0.8,
gradient: {
0.45: "rgb(0,0,255)",
0.55: "rgb(0,255,255)",
0.65: "rgb(0,255,0)",
0.95: "yellow",
1.0: "rgb(255,0,0)"
}
});
var Data1={
max: 1,
data: sloopjohnb
};
heatmapLayer.addData(Data1.data);
var baseMaps = {
"Fond OSM": osm,
"Fond de carte de base": base,
"Photo. aérienne Google" : ggl2
};
var overlayMaps = {
'Heatmap': heatmapLayer
};
map = new L.Map('map', {
minZoom : 1,
maxZoom : 11,
boxZoom : true,
layers: [base, heatmapLayer]
});
var controls = L.control.layers(baseMaps, overlayMaps, {position: 'bottomright'});
controls.addTo(map);
map.addControl(L.control.search());
L.control.scale().addTo(map);
map.attributionControl.addAttribution('Heatmap.js');
map.setView(new L.LatLng(39.291,-5.9765),2);
// Disparition de la heatmap en fct du zoom
map.on('zoomend', function () {
if (map.getZoom() > 9) {
map.removeLayer(heatmapLayer);
}
});
});
</script>
</body>
</html>
Are you sure you are creating the listener correctly?
For example, this seems like it should be called when the user zooms. So something like:
Edited
map.on('zoomend', function () {
if (map.getZoom() > 9 && map.hasLayer(heatmapLayer)) {
map.removeLayer(heatmapLayer);
}
if (map.getZoom() < 9 && map.hasLayer(heatmapLayer) == false)
{
map.addLayer(heatmapLayer);
}
});
If you ONLY want the layer added/removed based on zoom, don't add it to your layer control here:
var controls = L.control.layers(baseMaps, overlayMaps, {position: 'bottomright'});
controls.addTo(map);
You will just have to make sure you are doing your adding/removing when it is necessary. Try messing with this set up a little and see where you get. Also, the Documentation is well written regarding the use of L.tileLayer
You can use the leaflet-zoom-show-hide library to do it. This will automatically show/hide your layers as you zoom.
zsh = new ZoomShowHide(map);
var marker1 = L.marker([50.096, 14.425]);
// minzoom, maxzoom
zsh.addLayer(marker1, 10, 13);
var marker2 = L.marker([50.076, 14.425]);
zsh.addLayer(marker2, 8, null);