Location Signatures That You Don't See: Highlights from the IEEE Signal Processing Cup 2016 Student Competition [SP Education]

When thinking about using technologies to find one?s location, many of us may consider satellite-based global navigation systems, such as the U.S. global positioning system (GPS). Smartphones today use GPS type signals and cellular network signals to determine the phone user's current location and offer a broad range of location-related services. But when there was no such real-time connection and signal to analyze, for example, having only a piece of video or voice recording as an evidence of a news story or from child exploitation investigations (which have become an important global issue being addressed by the United Nation's UNICEF organization), are we out of luck?