Considering the constant process of transformation of urban and rural areas of the municipalities, the Estatuto da Cidade provides that they should be reviewed (evaluated and updated) every ten years. Than the creation of methodologies for analysis, evaluation and updating of Municipal Master Plan is very important. One of the important elements to be reviewed is the role played by the specialization of information. This research was to examine the role played by the spacialization of information in Municipal Master Plans to subsidize management and municipal environmental planning in the Metropolitan Region of Belem (RMB), in Para State. Specifically, it sought to characterize and analyse the use of cartography and geographic information systems as tools and instruments of spacialization of information, and submit proposals for changes in cartography and information tools in Municipal Master Plans to subsidize these tools in the process of updating the plans. The methodology understood reading and interpreting work on analyses of management instruments, such as the Municipal Master Plan, cartography and geographic information systems; semi-structured interviews with technicians and managers of municipal offices of environment, creating arrays of categories for the purpose of analyzing, specialization policies and cartographic elements of thematic maps present in Master Plans of municipalities in the Metropolitan Region of Belem and to check on other Master Plans of the Amazon Region, thematic maps serve as examples. From the analyses was possible to make propositions subsidies as new thematic improvement of cartography used in Master Plans that should be reviewed and updated and to assist the process of preparation of new plans. Concluded through research that even considering their importance, the spacialization of information is little used in environmental management of municipalities of RBM and is not incorporated within the stages of the process of elaboration and implementation of Municipal master plans of RMB.
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