Abstract: A method for encapsulating metadata in a contextual data stream is described. The method may include receiving sensor data from a sensor. The method may include receiving metadata associated with the sensor data, wherein the metadata is defined as a probability vector based on a context set associated with the sensor data. The method may also include combining the sensor data and the metadata into a contextual data stream.

Abstract: A method for determining a location change based on contextual data is disclosed. The method may include gathering contextual data from ambient sensors of a device. The method may include determining a probability value that the device has changed location. The method may include comparing the probability value with a predetermined value. The method may include determining whether the location has changed based on the comparison of the probability value with the predetermined value.