====== Indoor positioning systems for Android ======

a comprehensive article on different indoor positioning technologies

http://spectrum.ieee.org/telecom/wireless/new-indoor-navigation-technologies-work-where-gps-cant

THE CHOSEN SYSTEM:
 
===== Red Pin =====

  * [[http://redpin.org/|Red Pin]]
  * **wi-fi fingerprint based**

october 2014 -> ? USING REDPIN

  * [[redpin-server|running redpin.jar]] on the edar server 
  * because of post issues (not able to open access to 8000 outside of epfl network) moved the server to KUCJICA. same process, same database;

MEASUREMENTS

  * december 12, BC building; performed 4 measurements all lasting about 2 minutes. kept track of the movement by hand (noted positions and times on a peace of paper) and compared that to the data the app sent to the server; results can be found here [[http://kucjica.kucjica.org/emperors-vizi/bc-measurements-12-12-14.html|measurement tests 12.12.2014]]

OTHER POSSIBLY USEFUL APPS:

===== Foot Path =====

  * [[http://www.comsys.rwth-aachen.de/research/projects/footpath/|FootPath]]: a project developed at the Aachen University; 
  * **infrastructure-less tracking**: starts from a known point and with a floor plan; uses accelerometer+gyroscope to determine the path taken from the starting point; 
  * **+** doesn't need to be online, doesn't need any additional information about the environment; 
  * **-** needs a map to be pre-uploaded;
  * **-** error adds up;
 TEST:
  * cloned the [[https://github.com/COMSYS/FootPath|github]] project, imported in Eclipse
  * downloaded a map using JOSM (download here and run: java -jar josm-tested.jar)
  * replaced the value in Loader.java, line 200 with the name of the map (epflmap)
  * chmod +x update-revfile.sh, run ./update-revfile.sh
  * restart Eclipse, run the app.
  * it crashes, on all phones, immediately :(
  * there is a version of FootPath in playstore, this one works well enough to test;

===== IDocent =====

  * [[http://www.egr.msu.edu/classes/ece480/capstone/spring11/group02/|IDocent]] developed at Michigan State University, aimed at guiding blind people around buildings, has a text-to-speech engine;
  * uses **wi-fi triangulation** and custom maps;
  * watch video here http://www.youtube.com/watch?v=OV-9OPnu3cM 

TEST

  * dwloaded the [[http://www.egr.msu.edu/classes/ece480/capstone/spring11/group02/documents/iDOCENT.zip|zip file for Android]] 
  * imported the project into Eclipse and set the target Android version
  * run as application on Motorola test phone; 
  * iDocent freezes, then has to quit because it's not responding; :( ([[idocent-error-log|error log]])
===== TeroM IPS =====

  * https://github.com/TeroM/indoor-position-tracker
  * wi-fi fingerprint based
  * fingerprints need to be preset (define points on a map, scan and remember the results); after creating this base/dictionary of positions, it locates the user closest to the defined points;

TEST

  * cloned the project [[git@github.com:TeroM/indoor-position-tracker.git]], loaded to Eclipse
  * run on Motorola, loads and works well!

===== a little bit of microsoft input: RADAR =====

triangulation systems based on signal strength http://research.microsoft.com/en-us/projects/radar/

===== the calculation =====

how to calculate the geographic midpoint for two or more points on the earth's surface; how to calculate the center of minimum distance; how to calculate the average latitude/longitude
http://www.geomidpoint.com/calculation.html

===== MORE =====

  * WIGGLE: a contribution based map of wireless access points. https://wigle.net/

===== conclusions ======

need something closest to the TeroM tool + a general map of the space; map the space out (preset points and scan the db at each point); load all this information in the app (with an option to edit or re-measure db strengths);