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Solving the Privacy Problem
This method produces remarkably detailed data on
human movements without compromising human privacy by:
1) keeping the precise, valuable, data on movements in
public places -- where a precise record of the movements
does not make it possible to identify the person; and,
2) blurring the data on movements in areas that are not
public.
Detailed maps (like those built into portable GPS navigation
units) make it possible to identify public areas. In the language of GIS (Geographic Information Systems), the method involves reverse geocoding using a map with bounday files (e.g. Mapmarker with Parcel Precision from Pitney Bowes Business Insight, PxPoint from CoreLogic, Teleogis' GeoBase Transactional with Navteq Parcel Boundaries).


In effect, the method is a filter -- keeping the useful
data on public movements, and blurring the toxic data on movements
in private places.
The net result is that it is impossible to know from whom
a given track is drawn. The location data is anonymized, and
privacy is protected.
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