Remote, automated, day/night detection, classification, and tracking of personnel and vehicles is vital to a wide variety of security, law enforcement, and military applications. A practical system must consider cost, power, size, and operational limitations. Video tracking offers the ultimate in definitive identification and tracking capabilities, but also maximizes cost and power consumption. 360 degree views from a single infrared camera maximize the ability to monitor and track targets in a wide area. Other technologies using acoustic, seismic, and magnetic sensing can be used to extend the range or resolution of the system as well as preserving power by performing initial detection of targets to trigger video sensors. A variety of detection, fusion, and tracking algorithms can be applied to monitor targets around these sensors and across a wide area using multiple sensors.