And what exactly is wrong or illegal about what Google did?  There is no expectation of privacy in public.   There is no expectation of privacy from a broadcasting transmitter.  So I do not know what Google collected with its drive by photos, but I suspect it noted any wifi in the area, certainly the SSID and what type of protocol / frequencies were being used along with encryption present or open.  And it's GPS location where detected.  Maybe signal strength from the street.  If it was open it might have tried to access the connection and acquire further connection data...but I assume all of this would occur over a matter of seconds as the Google vehicle drove past.  It could also make note of any other broadcasting devices in the area (bluetooth devices, cell phone, laptops, etc.).  I'm sure the government wants the data.  And want to make sure their broadcasting equipment wasn't logged as vehicles drove past their gates.