While different paradigms regarding noise mapping are found in the literature, most of them involve considerable investment in sophisticated equipment, considerable human resources and time-consuming measurements, making it difficult to update results, for instance, on an annual basis. The aim of this paper is to introduce and test a new methodology to obtain useful noise information with a minimal cost. The result is a simple mathematical model, comprising a set of adjusted parameters, which allows to estimate with reasonable precision the equivalent sound level at any location not previously measured. For the covering abstract see ITRD E107776.