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Indoor and underground       orientation and       navigation       by using the barometer       sensor       Elizaveta Ka...
Overview      1. Problem statement for indoor orientation & navigation      2. Application example: (Berlin) Underground  ...
Problem statement for indoor orientation       Do you need an (outdoor) navigator?       1992: no       2012: yes      ...
Application example: (Berlin) Underground       Undergrounds are used by        million people every day       Many are ...
Approach with Barometer          Cell-id Positioning in Undergrounds allows to define the line           and a position b...
Data-collection                                                                       Specialized app to                  ...
Analysis: Characteristics I       Multiple underground train stations with filter                                  Sensor...
Analysis: Characteristics II                                                               Underground Station            ...
Conclusion       Cellid positioning offers the underground line and an interval        between 4-6 stations, which is not...
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droidcon 2012: Indoor orientation in underground based on barometer, Roland Wagner, Beuth Hochschule für Technik Berlin

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Indoor orientation and navigation in buildings and underground public transport is still a challenge. A key problem is the determination of the levels, e.g. floors and platforms, especially in environments with large amount of balconies and more or less levitating escalators, lifts and stairs. Another desired application is navigation or at least orientation in public undergrounds, which is missing due to missing common available sensors. GPS is not available in tunnels. Wifi cells are very unusual at least in the Berlin underground environment. Infrastructure based sensors and communication would be able to solve a personal navigation, but requires investments. With the introduction of barometer as a sensor in the Android 2.3 API and the first available Android mobile phones with build-in barometer sensors (Xoom and Galaxy Nexus), pressure can be used to calculate altitudes or even more relevant to measure pressure differences, e.g. between building levels and stations. This talk is intended to give and get a feeling about the given accuracy and robustness in relation to indoor positioning for buildings and undergrounds and should report about the ongoing, but already promising experiments.

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droidcon 2012: Indoor orientation in underground based on barometer, Roland Wagner, Beuth Hochschule für Technik Berlin

  1. 1. Indoor and underground orientation and navigation by using the barometer sensor Elizaveta Karpakova, 3. Sem. Geoinformation Master mit Kaatz, Richter und Zimmermann (Geoality GbR), … und Prof. Dr. Roland-M. WagnerDroidcon 2012, Berlin, Urania, 14.3.2012
  2. 2. Overview 1. Problem statement for indoor orientation & navigation 2. Application example: (Berlin) Underground 3. Approach with Barometer 4. Data-collection 5. Analysis 6. ConclusionBeuth Hochschule für Technik Berlin – University of Applied Sciences 2
  3. 3. Problem statement for indoor orientation  Do you need an (outdoor) navigator?  1992: no  2012: yes  GPS is not usable for indoor orientation and positioning, other sensors are needed  Challenge: Change!  More Change in indoor environment, e.g. fairs, cons  Some privacy aspects, e.g. indoormaps only for welcomed visitors and not for everybody in the net; => local infrastructure  Additional indoor information needed, e.g. pics, contact, time, location => e-flyer  An early project is: openfloormap.orgBeuth Hochschule für Technik Berlin – University of Applied Sciences 3
  4. 4. Application example: (Berlin) Underground  Undergrounds are used by million people every day  Many are tourists and need permanent orientation & navigation  Orientation needed also between stairs and stations  Frequent users might be interested e.g. for a wake- up app  Only a few underground CC-At-By Ingo http://www.flickr.com/photos/30184910@N06 operators offer an (open) interfaceBeuth Hochschule für Technik Berlin – University of Applied Sciences 4
  5. 5. Approach with Barometer  Cell-id Positioning in Undergrounds allows to define the line and a position between 4-6 stations  Underground stations have different altitudes due to crossings and surface  Barometer / pressure measurement is robust and does not require much energy  Moving train pressure change for station counting  Only deltas are needed  Absolute altitude calculation with weather serviceBeuth Hochschule für Technik Berlin – University of Applied Sciences 5
  6. 6. Data-collection Specialized app to capture the context Which line? Which direction Walking / Stairs Train movement Capturing of all smartphone available sensor data https://play.google.com/store/apps/details?id=de.geoality.activitysBeuth Hochschule für Technik Berlin – University of Applied Sciences 6
  7. 7. Analysis: Characteristics I  Multiple underground train stations with filter Sensor Pressure Filtered PressureBeuth Hochschule für Technik Berlin – University of Applied Sciences 7
  8. 8. Analysis: Characteristics II Underground Station Pressure changes due to tunnel effectsBeuth Hochschule für Technik Berlin – University of Applied Sciences 8
  9. 9. Conclusion  Cellid positioning offers the underground line and an interval between 4-6 stations, which is not suficient  Acceleration and pressure changes are characteristic enough to count stations  Pressure Delta between (multiple) stations can additional be used for absolute positioning  Very robust for determination of levels (underground stairs, buildings)  Currently only two android devices available (Xoom, Galaxy Nexus)  Apps, Data and Bachelor Thesis availableBeuth Hochschule für Technik Berlin – University of Applied Sciences 9

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