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.

Check out the step-by-step tutorial How to use OpenLayers

  1. Install the npm package.

  2. Include the CSS file.

    If you have a bundler that can handle CSS, you can import the CSS or include it with a <link> in the head of the document via the CDN

  3. Include the following code in your JavaScript file (Example: main.js).

  1. Replace YOUR_MAPTILER_API_KEY_HERE with your actual MapTiler API key.

  2. 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.

  1. Create GeoJSON source. The following snippet creates GeoJSON source hosted on MapTiler (check out the How to Upload GeoJSON to MapTiler 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(),
   });

  2. 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)',
     }),
   }),
 };

  3. 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()];
 };

  4. Add the vector layer.

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

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

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

  1. Import the new modules needed to add the new functionality.

    
 import VectorLayer from 'ol/layer/Vector.js';
 import VectorSource from 'ol/source/Vector.js';
 import Style from 'ol/style/Style.js';
 import Stroke from 'ol/style/Stroke.js';
 import Fill from 'ol/style/Fill.js';
 import CircleStyle from 'ol/style/Circle.js';
 import GeoJSON from 'ol/format/GeoJSON.js';

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

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

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

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

  4. 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()];
 };

  5. Add the vector layer.

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

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

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