Method of calculating signal propagation loss and creating a data base therefor

A method of creating a data base used for calculating a propagation loss of a signal transmitting from a transmitter, receiving by a receiver located in proximity of a road, and propagating through a propagation environment, comprising the steps of:

• providing a preliminary data base including at least,
• a location profile of said transmitter,
• a location profile of said receiver,
• an elevation profile of said propagation environment, and
• a road profile of said propagation environment including at least a road density profile and a road classification profile,
• defining an area surrounding location of said receiver located within said propagation environment;
• calculating a road density constant based on said road profile of said area;
• calculating a road constant based on said road classification profile of said road;
• calculating an environmental factor by summing said road density constant, and said road constant;
• and
• modifying said preliminary data base according to said environmental factor to produce said data base.