Multiple sensing network units are deployed overhead in a venue. Each unit supports a video system for detecting a level of activity in the venue, and one or more sensing systems, such as an RFID system for reading RFID tags in the venue and/or an ultrasonic locationing system for locating mobile devices in the venue, in response to the activity level detected by the video system. The performance of the sensing systems is adjusted and optimized in response to the detected activity level.
