a deliberate decision seems to have been made to count the pedestrians by the hour. one could assume that it would be possible to choose a different (finer or coarser) interval
historical perspective on census surveys, statistical data on population as a gouvernmental technology?
the unit of observation is defined as person/h. it is defined in absolute numbers. it does not decide between different categories of people (even though technically it could decide between 'adults' and 'children')
the unit of observation is the count of person detected by the devices sensors during one hour