| 摘要 |
A system and methods enable a mobile communications device to determine the Public Safety Answering Point (PSAP) that serves the device, without disclosing the device's exact location. The device makes a query to its service provider that includes a bounded description of the device's location. The mobile device receives a first set of "edges" corresponding to a set of polygons defined on the earth's service. The mobile device then determines which of the received polygons it is included within by extending an imaginary latitudinal line through the polygon's edges and counting the number of intersections.
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