The way of distributing and returning the GPS devices is time
consuming and risky: will all devices be returned? How is a representative
user group selected? A good point is that the collection
of data is during a fixed timespan: all data is collected at
the same dates during the same conditions. The experiment is
fixed in place and time. Another advantage is the easy collection
of (essential) background information.
6.2 Processing
At the moment retrieving and validating the tracks is a time
consuming part of the processing. This part can be optimized by
developing tools for automatically classifying, cleaning and
splitting of tracks and for recognizing stops and destinations.
Manual work has to be reduced to a minimum.