Five different population density surfaces were produced as result of the proposed methodology for the
municipality of Marabá, according to the operator used to integrate indicator variables (simple average,
weight average, fuzzy minimum, fuzzy maximum and fuzzy gamma operators).
To analyze the surface results, in the absence of population data distributed in a more detailed spatial unity
as census tract (2000), we took resident population data from the National Institute of Colonization and
Agrarian Reform (INCRA – Instituto Nacional de Colonização e Reforma Agrária) for the official settlement
projects in 2003 (Projetos de Assentamentos - PA) (MDA 2003) as a reference. Figure 6 presents the PAs
limits over the original census tract representation.