title: How to specify the projection for GeoJSON in openlayers3?
body: <p>My intention is to load GeoJSON data and display it on the map. Coordinates of the features specified in GeoJSON are normal lon/lat. For some reason openlayers is rendering them using the projection used by the map and without converting them.</p>
  
  <pre><code>// Underlying sat layer.
  var world = new ol.layer.Tile({
      source: new ol.source.MapQuest({layer: 'sat'})
  });
  
  // GeoJSON data.
  var geojsonObject = {
      'type': 'FeatureCollection',
      'features': [
          {
              'type': 'Feature',
              'geometry': {
                  'coordinates': [ 50.07539747, 19.76809501 ], 
                  'type': 'Point'
              },
          }
      ]
  };
  
  var vectorSource = new ol.source.Vector({
      features: (new ol.format.GeoJSON()).readFeatures(geojsonObject)
  });
  
  var vectorLayer = new ol.layer.Vector({
      source: vectorSource
  });
  
  // Map.
  map = new ol.Map({
      target: 'map',
      layers: [world, vectorLayer],
      view: new ol.View({
          center: ol.proj.transform([37.41, 8.82], 'EPSG:4326', 'EPSG:3857'),
          zoom: 2
      })
  });
  </code></pre>
  
  <p>The point is being rendered in the middle of the map. By placing multiple points I determined that they are in fact moved relative to each other but by a small amount which leads me to believe the for some reason the map uses a different coordinate system for them.</p>
  
  <p>What I tried:
  Setting <code>crs</code> in GeoJSON, providing <code>defaultDataProjection</code> option to format. I use openlayers v3.8.2 and all solutions I found online are very outdated (and as far as I can see the API used to be way better, maybe I should just switch to an old version).</p>