Papers by Cláudia Durand Alves

Este estudo tem como objetivo o desenvolvimento de uma metodologia para a classificação automátic... more Este estudo tem como objetivo o desenvolvimento de uma metodologia para a classificação automática de áreas urbanas contínuas e dispersas que caracterizam a urbanização dispersa, de regiões do Estado de São Paulo com altos índices de urbanização. Busca-se desenvolver uma metodologia que permita repetir o procedimento em outras regiões do país, com o aumento da exatidão do mapeamento, assim como com a redução do tempo e a subjetividade. Para este fim utilizou-se a classificação Orientada a Objeto em imagens LANDSAT do município de São José dos Campos, relativas a 1985 e 1999. Este procedimento consiste na segmentação multiresolução das imagens e na classificação baseada na lógica fuzzy. Considerando a resolução espacial das imagens utilizadas e o tipo de relevo da área de estudo, a classificação orientada a objeto teve um bom desempenho no mapeamento de áreas urbanas. Os resultados obtidos mostram que a metodologia desenvolvida pode ser replicada em outras áreas urbanas. Palavras-chave: Análise orientada a objeto; Áreas urbanas; Sensoriamento Remoto.

Labor e Engenho, 2012
The present work intends to identify the areas which have appropriate environment for the procrea... more The present work intends to identify the areas which have appropriate environment for the procreation of the disease vector in the northern part of Labrea municipality, in the state of Amazonas. The environmental conditions found in the study region are highly favorable to the elevate density of mosquitoes and to their procreation in the larvae phase, as it is known that the ideal environment considered to its procreation is the aquatic one, where occurs around ¾ of the mosquito life cycle. The digital image processing techniques have been considered as an important tool to identify these areas and have aided the decision making in the public health segment. In order to achieve the purpose of this work, two approaches were made: the object-oriented analysis classification of an optical image and the proposal of a new methodological approach for the terrain description, resulting from the application of the algorithm called HAND. In this approach, the purpose is to characterize both the water bodies identified during the image classification and the possible flood regions, thus, favorable for the procreation of the Anopheles vector. In the spatial analysis stage, a local spatial regression model was used. As a result, it was concluded that de descriptor terrain model in the flood areas of the study region is an explanatory factor of the malaria incidence in the northern part of Labrea.
Multilevel object-oriented classification of quickbird images for urban population estimates
Proceedings of the 15th annual ACM international symposium on Advances in geographic information systems, 2007
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
Revista Brasileira de Estudos de População, 2010

Revista Brasileira de Cartografia, Feb 16, 2011
Este estudo tem como objetivo o desenvolvimento de uma metodologia de classificação automática de... more Este estudo tem como objetivo o desenvolvimento de uma metodologia de classificação automática de áreas urbanizadas contínuas e dispersas que seja replicável em diferentes regiões do Brasil. Com essa metodologia busca-se o aumento da exatidão do mapeamento bem como reduzir a subjetividade e o tempo empregado no procedimento. Para este fim, aplicou-se, usando o software Definiens, a classificação baseada em Objeto em imagem LANDSAT da região de Piracicaba, Limeira e Rio Claro, do estado de São Paulo, obtida em 2007. Este procedimento consiste na segmentação multiresolução das imagens e na classificação baseada na lógica fuzzy. Na avaliação dos resultados foram utilizadas imagens de alta resolução, disponíveis no Google Earth. O bom desempenho obtido na classificação automática da área de estudo (índice global de 0,94 e Kappa de 0,72) indica a viabilidade do método aplicado para outras áreas urbanizadas.

Revista Brasileira de Cartografia
Land use/cover change (LUCC) is a cross-disciplinary research field in which remote sensing and g... more Land use/cover change (LUCC) is a cross-disciplinary research field in which remote sensing and geographic information systems (GIS) techniques have played an important role. Sugarcane expansion - a major LUCC process in Brazil - has been monitored by INPE's CANASAT project since 2003 (http://www.dsr.inpe.br/canasat/). In this study, an assessment of land use/cover conversion is presented in a region of important sugarcane expansion, the município of Barretos, in São Paulo State, in the 2003-2009 period. Detection of land use/cover changes is performed by classification of 2003 land use/cover and comparing 2003 classes with 2009 CANASAT maps. Land use/cover classification uses Landsat TM, and MODIS EVI2 time series, and two different techniques, segmentation followed by supervised classification, and object-based image analysis (OBIA) combining remotely sensed imagery and ancillary data. Results show that at least 40% of the increases in sugarcane area were due to conversion of ...

Theoretical and Empirical Researches in Urban Management, 2016
The unplanned urbanisation causes severe environmental, economic and social impacts to a region a... more The unplanned urbanisation causes severe environmental, economic and social impacts to a region and its surroundings. Without providing adequate infrastructure, peri-urban areas might turn into dispersing and disorganised urban sprawls. The concept of sustainability already confirms the need of integrated urban and water resources management. For that, policymakers and planners need to be aware of the impacts caused by land use and land cover changes while urbanising a region. Remote sensing techniques and GIS frameworks provide tools to process and achieve data in a less expensive, time-efficient and accurate way. In addition, hydrological models simulate the effects of different land use change scenarios on the basin runoff or discharge. For such assessment, the runoff curve number method is widely used due to requiring a few parameters, such as land use and land cover classes and hydrological soil groups. However, for the determination of hydrological soil groups, the saturated h...

Revista Brasileira de Cartografia, 2009
Este trabalho dedica-se a explorar métodos cognitivos de classificação de imagens QuickBird, visa... more Este trabalho dedica-se a explorar métodos cognitivos de classificação de imagens QuickBird, visando detectar áreas residenciais homogêneas. A área de estudo localiza-se em um setor sul da cidade de São José dos Campos, São Paulo. Por meio de uma abordagem baseada em segmentação multinível e de uma rede hierárquica de classificação com seis níveis, identificaram-se áreas residenciais homogêneas em termos de densidade de ocupação e de grau de aproveitamento do terreno por parte das edificações, isto é, residências unifamiliares ou edifícios. A rede de classificação utilizou atributos espectrais, geométricos e topológicos dos objetos (ou regiões) em cada nível de segmentação, bem como suas características contextuais e semânticas de relacionamento entre os distintos níveis hierárquicos. A classificação final de unidades residenciais homogêneas foi submetida a um processo de validação, utilizando-se um índice de concordância Kappa baseado em objetos.

Caracterização socioeconômica do espaço residencial construído utilizando imagens de alta resolução espacial e análise orientada a objeto
Neste trabalho foi analisado o espaco residencial da cidade de Sao Jose dos Campos, a partir de u... more Neste trabalho foi analisado o espaco residencial da cidade de Sao Jose dos Campos, a partir de um mapa tematico de cobertura do solo intra-urbano contendo as classes : vegetacao, tipos de telhados (metalico, concreto amianto, telha cerâmica, etc.), piscinas, sombra, asfalto e solo. O mapa tematico foi obtido por meio da segmentacao multiresolucao e classificacao utilizando-se a analise orientada a objetos em uma imagem QUICKBIRD, com 0,61m de resolucao espacial, no software e-Cognition 4.0. A partir das amostras de quadras residenciais foi realizada a analise dos atributos das classes de cobertura do solo que mais bem caracterizavam as classes de interesse. A limiarizacao da area relativa das classes de cobertura nas amostras permitiu a elaboracao de um conjunto de descritores para a classificacao das quadras residenciais como areas de ocupacao de populacao de baixa, media e alta renda. Os resultados obtidos foram avaliados estatisticamente atraves da matriz de confusao e do calcul...

Detection of Potato Plantation Areas with Medium Resolution Images: Case of Bueno Brandão, MG
In the city of Bueno Brandão, South of Minas Gerais State, Brazil, the Watershed of Rio das Antas... more In the city of Bueno Brandão, South of Minas Gerais State, Brazil, the Watershed of Rio das Antas is located prior to the public water supply and is susceptible to hydro-degradation due to the intensive agricultural activities developed in the area. The potato plantation is the most significant cropping in the city. Because of the possibility of interfering in the preservation areas, mainly the ones surrounding water courses and springs, it is very important to do the assessment of the plantation sites, in order to avoid the risk of water contamination. The procedures adopted by the agro activity farmers generally present the following features: intensive use of agro-chemicals, cropping in places with slopes which are higher than 20%, close to or in permanent preservation areas. The scope of this study was to develop the proper methodology for the assessment of the plantation areas, regarding the short time of procedure, as the period between the plantation and the harvest occurs in...
Análise Orientada a Objeto No Mapeamento De áreas Urbanas Com Imagens Landsat
Boletim de Ciências …, 2009
Uso do Sensoriamento Remoto e do Cálculo do Índice de GINI para a estimativa da desigualdade social com a expansão da área urbana: caso de Bueno Brandão, MG

Qual É a Eficácia Das Ferramentas De Planejamento Ambientais No Processo De Urbanização Da Bacia Do Rio Juqueriquerê, Em Caraguatatuba, SP?
Revista Brasileira de Gestão e Desenvolvimento Regional, Oct 27, 2015
In the beginning of this study, it was possible to comprehend the urban expansion of Juqueriquere... more In the beginning of this study, it was possible to comprehend the urban expansion of Juqueriquere River Basin in Caraguatatuba, Northern Coastline of Sao Paulo State, Brazil, from 1986 to 2010. Remote sensing techniques were used to obtain information about the urbanization process in a multi-temporal analysis. In this period, mainly in this area, the urban development scenery completely changed because of the governmental project called Pre-Salt, which provided massive investments into gas exploration. This basin was previously vulnerable to irregular housing and flooding. However, some technical components, such as local outcomes of the environmental licensing process at the state or national level, were not considered. Thus, the political and normative components were not in the scope of public hearings. The purpose of this study was to verify the urbanization process, which occurred in the expansion area, and which determined whether this technical component should have been considered during the licensing process of the megaprojects for the effectiveness of environmental-planning tools.
In the beginning of this study, it was possible to comprehend the urban expansion of Juqueriquere... more In the beginning of this study, it was possible to comprehend the urban expansion of Juqueriquere River Basin in Caraguatatuba, Northern Coastline of Sao Paulo State, Brazil, from 1986 to 2010. Remote sensing techniques were used to obtain information about the urbanization process in a multi-temporal analysis. In this period, mainly in this area, the urban development scenery completely changed because of

In this study orbital remote sensing data were processed in a GIS for the verification of urban e... more In this study orbital remote sensing data were processed in a GIS for the verification of urban expansion between 2000 and 2007 in the county of Bueno Brandão, state of Minas Gerais. The reason for choosing this period was that in the last decade, there was a growth of rural evasion in the city, due to the available governmental habitation programs. Although there was a significant and visible expansion, there was no available data of the current area covering the urban settlements. The classification of TM5-Landsat images was done by the use of an object-based approach, applied in the the Definiens 7 software. Spectral, relational and textural attributes were used for the definition of classes, including the Normalized Difference Vegetation Index (NDVI), which allows the separability of the vegetation class, and also, the textural homogeneity, which was used through specific fuzzy functions for the urban and bare soil classes, making it possible to reduce the confusion in the proce...

This work analyzed the residential area of the city São José dos Campos using a thematic map cont... more This work analyzed the residential area of the city São José dos Campos using a thematic map containing the following intra-urban classes: vegetation, types of roofs (metal, concrete, asbestos, ceramic tiles, etc.), swimming pools, shadow, asphalt, bare soil. The thematic map was obtained by a multi scale segmentation and object-oriented classification of a QuickBird image with 0.61 m spatial resolution using software e- Cognition 4.0. Samples of residential blocks were obtained and the attributes of the land cover classes were analyzed to characterize the final classes of interest. A threshold of each intra-urban class in the sample was used to create the description of the blocks occupied by low, medium and high income population. The results were statistically evaluated through the error matrix and the calculation of Kappa coefficient using as reference a map thematic obtained through visual interpretation and field research. It was observed that there is high correlation between...
In the beginning of this study, it was possible to comprehend the urban expansion of Juqueriquerê... more In the beginning of this study, it was possible to comprehend the urban expansion of Juqueriquerê River Basin in Caraguatatuba, Northern Coastline of São Paulo State, Brazil, from 1986 to 2010. Remote sensing techniques were used to obtain information about the urbanization process in a multi-temporal analysis. In this period, mainly in this area, the urban development scenery completely changed because of
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Papers by Cláudia Durand Alves