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This paper proposes a methodology for Geographic Data Modeling and Decisions Making(MODAGE), with an application oriented to volcanological studies and decision making; due to the existence ofdata of international concern for the volcanological studies and to the importance of natural disasters provocatedby the volcanic activity.This methodology conduces the user through three logic levels until the previous implantation stage of its project,planned for a Geographic Information System (GIS). The levels are built from maps, photogeological maps, aer-ial photographs, satellite images, and other entries, which can be models of spatial representation of the reality,done by the matter expert. Consequently, as a starting point, the methodology requires such model.Level 0, is the basic level (first step), of representation. Where the designer will show just the present graphic elementsand their centroids, the centers of the graphics objects. Level 1, the external influences of other systems will be shown,this means, its environments. The systems that interact with the project to model will be represented. Level 2, the char-acteristics of the objects are defined and their spatial relations with other objects, its importance with respect to the haz-ards, crisis on natural disasters. At least, the detailed description of each modeled object is proposed by mean of a datadictionary. With the level 2. the system documentation is finished, and the project is ready to be implanted using a GIS.MODAGE is a methodology that has been designed with two purposes. First, the general character that documentsthe GIS database, describing the graphics objects and their attributes, and second, its helps to the poor structureddecision making process during the occurrence of natural disaster or crisis, specialty those of volcanological type.MODAGE, is a new flexible tool, which leave open proposals for future research in this field.

Metodologia para el modelaje de datos geograficos y toma de decisiones (MODAGE): una aplicacion a estudios vulcanologicos