title: Format MongoDB Query output
body: <p>I'm currently running a MongoDB instance to save collected tweets within a geo-box in realtime. With that, I want to generate a heatmap to show where the most tweets were sent in Amsterdam. To do that I have to query the geo line only. That works with the following line of code:</p>
  
  <pre><code>db.testtweets.find({"geo": { "$ne": null } }, { "geo": 1 });
  </code></pre>
  
  <p>Unfortunately, this returns more info then the Google Maps API needs. Output:</p>
  
  <pre><code>{ "_id" : ObjectId("56fea2cf206e3712f3d1a9bb"), "geo" : { "type" : "Point", "coordinates" : [ 52.3746373, 4.85773855 ] } }
  </code></pre>
  
  <p>What I want as output:</p>
  
  <pre><code>52.3746373, 4.85773855
  </code></pre>
  
  <p>I'm quite new to MongoDB, so would really appreciate any suggestions. </p>