I want to know the extent to which sensors (cameras, temperature,
vibration, and other kinds are sensors) are being used worldwide for
whatever purposes.  For example, how many cameras are being used to
track or identy people in various settings.

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Clarification of Question by wanttoknowmore-ga on 18 Aug 2004 23:02 PDT

I want to know how many cameras are being used to track people, e.g.,
at ATM machines, at subways and airports, and at business
establishments.  How many GPS systems are being used wordlwide.  What
about RFIDs?

You have to add more information for your question to get a appropriate answer.
Thanks