Claudia Durand Alves

Multilevel object-oriented classification of quickbird images for urban population estimates

This paper is committed to explore object-oriented methods for the classification of Quickbird images, aiming to support future urban population estimates. The study area concerns the southern sector of São José dos Campos city, located in the State of São Paulo, Brazil. By means of a multi-resolution segmentation approach and a six-layer hierarchical classification network, homogeneous residential areas were identified in terms of density of occupation and building standards (single dwelling units or high-rise buildings). The classification network was built upon spectral, geometrical and topological features of the objects in each level of segmentation as well as upon their contextual and semantic interrelationships in-between the hierarchical levels. The final classification of homogeneous residential units was subject to validation, using an object-based Kappa statistics.

Dinâmicas de urbanização na hiperperiferia da metrópole de São Paulo: análise dos processos de expansão urbana e das situações de vulnerabilidade socioambiental em escala intraurbana

The objective of this article is to analyze, on an intraurban scale, the interrelations among processes of urban expansion and situations of socioenvironmental vulnerability in a hyperperipheral region of the Sao Paulo Metropolitan Region in recent years (2000 to 2006). This geographical region includes the district of Cidade Tiradentes and its surrounding area, located at the extreme eastern side of the municipality of Sao Paulo. The overall methodology of the study involves the mapping of the use of the soil and of the areas of urban expansion, using satellite images, as well as the identification and characterization of situations (areas) of socioenvironmental vulnerability. To this end, socioenvironmental indicators are constructed and analyzed based on census sectors from the Federal Census of 2000, including socioeconomic, demographic and environmental data. The results show a strong correlation between the processes of urban expansion and growth of substandard settlements and situations of socioenvironmental vulnerability in the hyperperipheral region of Cidade Tiradentes and its surrounding area. It was also seen that there are broad overlappings between social and environmental vulnerabilities, with strong concentration of social and environmental problems and risks in certain areas, as is the case of the census sectors of high socioenvironmental vulnerability in the Cidade Tiradentes region. These areas show irregularity in the use of the soil and widespread presence of substandard settlements such as shantytowns and irregular subdivision projects. There are also extremely critical socioeconomic conditions, with very low levels of income, formal education and sanitation.

Dinámicas de urbanización en la hiperperiferia de la metrópoli de San Pablo: análisis de los procesos de expansión urbana y de las situaciones de vulnerabilidad socioambiental en escala intraurbana

The objective of this article is to analyze, on an intraurban scale, the interrelations among processes of urban expansion and situations of socioenvironmental vulnerability in a hyperperipheral region of the Sao Paulo Metropolitan Region in recent years (2000 to 2006). This geographical region includes the district of Cidade Tiradentes and its surrounding area, located at the extreme eastern side of the municipality of Sao Paulo. The overall methodology of the study involves the mapping of the use of the soil and of the areas of urban expansion, using satellite images, as well as the identification and characterization of situations (areas) of socioenvironmental vulnerability. To this end, socioenvironmental indicators are constructed and analyzed based on census sectors from the Federal Census of 2000, including socioeconomic, demographic and environmental data. The results show a strong correlation between the processes of urban expansion and growth of substandard settlements and situations of socioenvironmental vulnerability in the hyperperipheral region of Cidade Tiradentes and its surrounding area. It was also seen that there are broad overlappings between social and environmental vulnerabilities, with strong concentration of social and environmental problems and risks in certain areas, as is the case of the census sectors of high socioenvironmental vulnerability in the Cidade Tiradentes region. These areas show irregularity in the use of the soil and widespread presence of substandard settlements such as shantytowns and irregular subdivision projects. There are also extremely critical socioeconomic conditions, with very low levels of income, formal education and sanitation.

Dynamics of urbanization in the hyperperiphery of the São Paulo Metropolitan Region: analysis of the processes of urban expansion and the situations of socioenvironmental vulnerability on an intraurban scale

The objective of this article is to analyze, on an intraurban scale, the interrelations among processes of urban expansion and situations of socioenvironmental vulnerability in a hyperperipheral region of the Sao Paulo Metropolitan Region in recent years (2000 to 2006). This geographical region includes the district of Cidade Tiradentes and its surrounding area, located at the extreme eastern side of the municipality of Sao Paulo. The overall methodology of the study involves the mapping of the use of the soil and of the areas of urban expansion, using satellite images, as well as the identification and characterization of situations (areas) of socioenvironmental vulnerability. To this end, socioenvironmental indicators are constructed and analyzed based on census sectors from the Federal Census of 2000, including socioeconomic, demographic and environmental data. The results show a strong correlation between the processes of urban expansion and growth of substandard settlements and situations of socioenvironmental vulnerability in the hyperperipheral region of Cidade Tiradentes and its surrounding area. It was also seen that there are broad overlappings between social and environmental vulnerabilities, with strong concentration of social and environmental problems and risks in certain areas, as is the case of the census sectors of high socioenvironmental vulnerability in the Cidade Tiradentes region. These areas show irregularity in the use of the soil and widespread presence of substandard settlements such as shantytowns and irregular subdivision projects. There are also extremely critical socioeconomic conditions, with very low levels of income, formal education and sanitation.