1. A method for determining a location of a wireless device in a communications network, the method comprising the steps of: (a) receiving a request for satellite assistance data from a requesting entity; (b) determining a reference location as a function of the request; (c) identifying one or more characterizing attributes as a function of an environment of the reference location; (d) determining a set of satellites as a function of the reference location; (e) determining whether more than one set of signal measurements should be acquired from one or more satellites in the set of satellites as a function of the identified one or more characterizing attributes; (f) acquiring the one or more sets of signal measurements; and (g) determining a location of the wireless device from the acquired measurements.