The problems of creating GIS "the noise of the city" are dwelled upon in this work. The list of sanitary indicators of the noise fields is given here. The basic rules of creation of mathematical models of noise fields spreading from fixed stationary sources (site, stadium, etc.), from moving objects, and also from objects which reflect noise are defined. An example of calculating noise field level in terms of sanitary indicators for two and more different sources of noise in a given point of observation.