In the present invention, data of a digital altitude map of a cell in a cellular communication system is compressed in a first node by defining a polygon essentially representing the boundary of the cell. Each polygon corner is defined by a point having two lateral coordinates and an associated altitude...http://www.google.fr/patents/US7676232?utm_source=gb-gplus-shareBrevet US7676232 - Altitude determination and distribution in cellular communication systems
Altitude determination and distribution in cellular communication systems
