Il sistema informativo geografico come strumento progettuale: il caso di studio del Masterplan della Medina di Costantina

This work shows the experimentation’s results of a projected instrument based on a Geographical Information System, realized by a research group formed by Italians and Algerians, on occasion of the Masterplan of Medina di Costantina. The SIG, formed by the stratification of the collected data allows the synchronous reading of single buildings information and at every level of aggregation, block or urban sector, as for instance the residence density with the number building level or the building typology with the level of degradation. The existence of difference data allows disyncrhronous analysis of information, in order to understand the courses of transformation processes in different time as for example the ones pertinent to the building consistence or the degradation level, useful the definition of urban management. The SIG is very efficient when it is use with the urban and architectonic project. About the urban project, the SIG produces the quality and degradation indexes, that allows to value the single unit level, in accordance with the priority and the classes of the necessary activities. The typology and historic-constructive classes of a district or sector of the city define the units and the ways of the activities, by a process that order and classify the building heritage. About the architectonic project, the SIG produce not only the geometric base within the project must find the real references, but it elaborate also a description of both the territory and the single building, by the formal and typological characterization, supporting the relationships among the single parts.