Real Surface Observations in the Analysis of Slums Situated on Hilly Terrain
Manoel do Couto Fernandes, Camila da Silva Vieira, Pedro Henrique Ferreira Coura, Renan Ramos da Silva

Abstract
The main goal of this study is to evaluate how area calculations on the real surface differ from the results on a planimetric reference surface, while alternating the analysis of variables in slums located on a mountainous area known as the Tijuca massif in Rio de Janeiro (Brazil). The study area was chosen from disordered urban expansion areas, which resulted in the construction of irregular settlement, known as slums on the massif, usually in steeply sloped areas. Researchers used some information acquired from the Pereira Passos Institute (IPP): data on slums included in the study area; hypsometry and the drainage to the construction of the associated Digital Elevation Model. The results indicated major differences between the real surface observations and the planimetric surface, generating an increase of around 0.79 km², and a reduction of around 2417.25 people/km² and 691.94 homes/km².

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