title: How does Google Indoor Navigation work?
body: <p>For a project at my university I have to collect information about Google Indoor Maps. I spent several hours searching information about how Google Indoor Navigation really works. I've found several links on how to create Google Floor Plans like this:</p>
  
  <p><a href="http://support.google.com/gmm/bin/answer.py?hl=en&amp;answer=1685896" rel="noreferrer">http://support.google.com/gmm/bin/answer.py?hl=en&amp;answer=1685896</a></p>
  
  <p>And how you can improve location accuracy with the Google Maps Floor Plan Marker app:</p>
  
  <p><a href="http://support.google.com/gmm/bin/answer.py?hl=en&amp;answer=2667756&amp;topic=1685871&amp;ctx=topic" rel="noreferrer">http://support.google.com/gmm/bin/answer.py?hl=en&amp;answer=2667756&amp;topic=1685871&amp;ctx=topic</a></p>
  
  <p>They say the app collects public broadcast data. But nowhere information about which information is collected and how. Several discussions here and a few articles I found say that google uses wifi-access points and the cellular antennas for indoor positioning. But I couldn't find any official information from Google, which I can use in my project.</p>
  
  <p>Can you suggest me where I can find answers to the following questions:</p>
  
  <ol>
  <li>How does the Google Maps Floor Plan Marker really work? Which information is collected and how? A official technical Google paper would be nice, so I can use that for my work.</li>
  <li>How can I increase the accuracy of the Google indoor navigation, by adding Wifi Access Points, Bluetooth stations or other technology?</li>
  <li>How can I add additional information like Emergency exits and toilets to a floor plan, so the user can navigate with his smartphone to this special points?</li>
  <li>Is it possible to add information about rooms, so the user can tap with the finger on them to get additional information? For Example which department is situated in this room and so on?</li>
  </ol>
  
  <p>I found a lot stuff about indoor positioning and indoor navigation. But nothing about how google uses them.</p>
  
  <p>Thanks in advance.</p>