To draw cartographic maps one depends on a system of localization with longitudes and latitudes, a scale, a projection and symbols. In the cartography, the maps have specific characteristics they classify that them, and represent selected elements of one definitive geographic space, of reduced form, using symbology and cartographic projection. For the cartographers, it writes Loch (2006, p.33), the maps are vehicles of transmission of the knowledge that can amplest and be varied possible or most restricted and objective possible and affirms that ' each map has its author, a question and a subject, exactly the maps of general reference, topographical or cadastrais'. The elaboration of thematic maps encloses the following stages: it collects of data, analysis, interpretation and representation of the information on a map base that generally, is extracted of the letter topographical. The thematic maps are elaborated with the use of techniques that objectify the best visualization and communication, distinguishing themselves essentially from the topographical ones, for representing phenomena of any nature, geographically distributed on the terrestrial surface. The phenomena can in such a way be of physical nature as, for example, the annual average of temperature or precipitation on an area, of abstract nature, human being or of another characteristic any, as the tax of development, social pointers, profile of a population as changeable such as sex, color and age, amongst others. Each map possesss a specific objective, in accordance with the intentions of its elaboration, therefore, different types of maps exist. The thematic map must fulfill its function, that is, to say what, where e, as definitive geographic phenomenon occurs, using graphical symbols especially planned to facilitate the understanding of differences, similarities and to make possible the visualization of correlations for the user. The fact of the thematic maps not to possess a historical inheritance of fixed conventions, the example of the topographical ones, if must to the thematic variations and the aspects of the reality that represent, being necessary adaptations differentiated to each situation.