OSM XML

Example of using the OSM XML source.

OSM XML vector data is loaded dynamically from a the Overpass API using a bbox strategy. Note that panning and zooming will eventually lead to "Too many requests" errors from the Overpass API.

<!DOCTYPE html>
<html>
  <head>
    <title>OSM XML</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>

  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import OSMXML from 'ol/format/OSMXML.js';
      import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      import {bbox as bboxStrategy} from 'ol/loadingstrategy.js';
      import {transformExtent} from 'ol/proj.js';
      import BingMaps from 'ol/source/BingMaps.js';
      import VectorSource from 'ol/source/Vector.js';
      import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';

      var map = null;

      var styles = {
        'amenity': {
          'parking': new Style({
            stroke: new Stroke({
              color: 'rgba(170, 170, 170, 1.0)',
              width: 1
            }),
            fill: new Fill({
              color: 'rgba(170, 170, 170, 0.3)'
            })
          })
        },
        'building': {
          '.*': new Style({
            zIndex: 100,
            stroke: new Stroke({
              color: 'rgba(246, 99, 79, 1.0)',
              width: 1
            }),
            fill: new Fill({
              color: 'rgba(246, 99, 79, 0.3)'
            })
          })
        },
        'highway': {
          'service': new Style({
            stroke: new Stroke({
              color: 'rgba(255, 255, 255, 1.0)',
              width: 2
            })
          }),
          '.*': new Style({
            stroke: new Stroke({
              color: 'rgba(255, 255, 255, 1.0)',
              width: 3
            })
          })
        },
        'landuse': {
          'forest|grass|allotments': new Style({
            stroke: new Stroke({
              color: 'rgba(140, 208, 95, 1.0)',
              width: 1
            }),
            fill: new Fill({
              color: 'rgba(140, 208, 95, 0.3)'
            })
          })
        },
        'natural': {
          'tree': new Style({
            image: new CircleStyle({
              radius: 2,
              fill: new Fill({
                color: 'rgba(140, 208, 95, 1.0)'
              }),
              stroke: null
            })
          })
        }
      };

      var vectorSource = new VectorSource({
        format: new OSMXML(),
        loader: function(extent, resolution, projection) {
          var epsg4326Extent = transformExtent(extent, projection, 'EPSG:4326');
          var client = new XMLHttpRequest();
          client.open('POST', 'https://overpass-api.de/api/interpreter');
          client.addEventListener('load', function() {
            var features = new OSMXML().readFeatures(client.responseText, {
              featureProjection: map.getView().getProjection()
            });
            vectorSource.addFeatures(features);
          });
          var query = '(node(' +
              epsg4326Extent[1] + ',' + epsg4326Extent[0] + ',' +
              epsg4326Extent[3] + ',' + epsg4326Extent[2] +
              ');rel(bn)->.foo;way(bn);node(w)->.foo;rel(bw););out meta;';
          client.send(query);
        },
        strategy: bboxStrategy
      });

      var vector = new VectorLayer({
        source: vectorSource,
        style: function(feature) {
          for (var key in styles) {
            var value = feature.get(key);
            if (value !== undefined) {
              for (var regexp in styles[key]) {
                if (new RegExp(regexp).test(value)) {
                  return styles[key][regexp];
                }
              }
            }
          }
          return null;
        }
      });

      var raster = new TileLayer({
        source: new BingMaps({
          imagerySet: 'Aerial',
          key: 'Your Bing Maps Key from http://www.bingmapsportal.com/ here'
        })
      });

      map = new Map({
        layers: [raster, vector],
        target: document.getElementById('map'),
        view: new View({
          center: [739218, 5906096],
          maxZoom: 19,
          zoom: 17
        })
      });
    </script>
  </body>
</html>