The present disclosure provides an apparatus and a method for computing data for guiding unmanned aerial vehicles (UAVs) in a three-dimensional (3D) air space. Stored network data including location data of network nodes as well as current network data including current connectivity data of the network nodes are acquired. By correlating the stored and current network data, current 3D coverage data indicating current network coverage along three dimensions in the 3D flight area (e.g. a handover probability or an interference caused by a UAV) are determined. The techniques of the present disclosure enable modeling and predicting a current coverage and connectivity state of 3D air space and facilitates control and operation of UAV air traffic.