In an embodiment, a data processing method provides an improvement in personal tracking and comprises, using a server computer, obtaining a plurality of personal calendar records, wherein each of the calendar records comprises a location value specifying a geographical location of an event, and a start time value specifying a start time of an event at the location; using the server computer, obtaining a plurality of present location updates, wherein each of the present location updates comprises a geo-location value indicating a then-current location of a computing device; using the server computer, creating and storing polygon data that defines a polygon in geographical space that contains a final set of the plurality of location values; using the server computer, determining a street address that is contained in the polygon; creating and storing a database record that associates a particular calendar record with the street address.
