Show MultiGeometry data from GeoJSON on the Map

This tutorial shows how to add a MultiGeometry GeoJSON overlay to the map using OpenLayers.

1. Copy the following code, paste it into your favorite text editor, and save it as a .html file.

2. Replace YOUR_MAPTILER_API_KEY_HERE with your actual MapTiler API key.

3. The next is up to you. You can center your map wherever you desire (modifying the starting position) and set an appropriate zoom level (modifying the starting zoom) to match your users’ needs. Additionally, you can change the map’s look (by updating the source URL); choose from a range of visually appealing map styles from our extensive MapTiler standard maps, or create your own to truly differentiate your application.

4. Create GeoJSON source. The following snippet creates GeoJSON source hosted on MapTiler Cloud (check out the How to Upload GeoJSON to MapTiler Cloud tutorial). Publish the dataset and copy the link to the geojson. Download the GeoJSON multigeometries sample data.

   
      const geojsonOverlay = new ol.source.Vector({
        url: `https://api.maptiler.com/data/YOUR_MAPTILER_DATASET_ID_HERE/features.json?key=${key}`,
        format: new ol.format.GeoJSON(),
      });
    

5. Create the styles. Create one style for each geometry type: point, line, polygon, etc.

   
    const styles = {
      'Point': new ol.style.Style({
        image: new ol.style.Circle({
          radius: 7,
          fill: new ol.style.Fill({
            color: 'rgb(68, 138, 255)',
          }),
          stroke: new ol.style.Stroke({color: '#fff', width: 4}),
        }),
      }),
      'LineString': new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: 'rgb(68, 138, 255)',
          width: 3,
        }),
      }),
      'MultiLineString': new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: 'rgb(68, 138, 255)',
          width: 3,
        }),
      }),
      'MultiPoint': new ol.style.Style({
        image: new ol.style.Circle({
          radius: 5,
          fill: null,
          stroke: new ol.style.Stroke({color: 'red', width: 1}),
        }),
      }),
      'MultiPolygon': new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: 'rgb(68, 138, 255)',
          width: 3,
        }),
        fill: new ol.style.Fill({
          color: 'rgba(255, 255, 255, 0.4)',
        }),
      }),
      'Polygon': new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: 'rgb(68, 138, 255)',
          width: 3,
        }),
        fill: new ol.style.Fill({
          color: 'rgba(255, 255, 255, 0.4)',
        }),
      }),
      'GeometryCollection': new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: 'rgb(68, 138, 255)',
          width: 3,
        }),
        fill: new ol.style.Fill({
          color: 'rgba(255, 255, 255, 0.4)',
        }),
        image: new ol.style.Circle({
          radius: 5,
          fill: null,
          stroke: new ol.style.Stroke({color: 'red', width: 1}),
        }),
      }),
      'Circle': new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: 'rgb(68, 138, 255)',
          width: 3,
        }),
        fill: new ol.style.Fill({
          color: 'rgba(255, 255, 255, 0.4)',
        }),
      }),
    };
    

6. Create a function that returns the style depending on the type of geometry of the features in the GeoJSON

   
    const styleFunction = function (feature) {
      return styles[feature.getGeometry().getType()];
    };
    

7. Add the vector layer.

   
    const geojsonOverlayLayer = new ol.layer.Vector({
      source: geojsonOverlay,
      style: styleFunction
    });
    map.addLayer(geojsonOverlayLayer); 
    

8. Fit the map view to the bounding box of the data.

   
    geojsonOverlay.once('featuresloadend', function() {
      map.getView().fit(geojsonOverlay.getExtent());
    });
    

Related examples

Point GeoJSON Layer

Example

Show Point data from GeoJSON on the Map: this tutorial shows how to add a Point GeoJSON overlay to the map using OpenLayers.

Polygon GeoJSON Layer

Example

Show Polygon data from GeoJSON on the Map: this tutorial shows how to add a GeoJSON overlay to the map using OpenLayers.

Choropleth GeoJSON

Example

This tutorial shows how to add a styled GeoJSON overlay to the map using OpenLayers, display a popup on click, and create a map legend.

Vector tiles with GeoJSON

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Learn how to display polygon from GeoJSON above vector tiles but bellow labels with OpenLayers using the ol-mapbox-style plugin.