Area Descriptor File - ADF synchronization is a bit more advanced. Essentially, the Tango platform takes the area learning data and compresses it down into a few key points. We will call these points anchors. The area descriptor file contains the data necessary for a Tango device to visually recognize an anchor as well as where the anchor is relative to the original scan. This in turn creates a consistent coordinate frame that Tango devices can position themselves within when they detect an anchor. Consequently, if this file is shared among multiple devices, they will actually report their position in a common coordinate frame!