127 resultados para Landsat ETM


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Ps-graduao em Geocincias e Meio Ambiente - IGCE

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Ps-graduao em Geocincias e Meio Ambiente - IGCE

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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)

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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)

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Ps-graduao em Agronomia (Energia na Agricultura) - FCA

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Conselho Nacional de Desenvolvimento Cientfico e Tecnolgico (CNPq)

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Este artigo apresenta informaes sobre o meio fsico obtidas por meio da compartimentao fisiogrfica em uma imagem Landsat 7 ETM+, visando o planejamento territorial do Municpio de Canania, no litoral sul do estado de So Paulo. Os compartimentos fisiogrficos foram identificados a partir de diferentes nveis hierrquicos de classificao por meio da anlise dos elementos texturais de relevo e drenagem, posteriormente associados s informaes referentes aos mapeamentos geolgicos e geomorfolgicos j existentes, aliados a trabalho de campo. O produto final, um mapa de Unidades Bsicas de Compartimentao (UBCs), serviu para nortear consideraes referentes aos processo de expanso urbana municipal. A metodologia utilizada mostrou-se com potencial de aplicao em outros estudos relacionados ao meio fsico, sendo necessria apenas a adequao dos dados a serem trabalhados. Palavras-chave: Compartimentao fisiogrfica, planejamento territorial, sensoriamento remoto.

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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)

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The Companhia Energetica de Sao Paulo - CESP owns six hydroelectric dams in the state of So Paulo. The dams, both in its construction and in operation, cause some environmental impacts, most of them negatives, for example, the flooding in regions before not flooded, deviation of the rivers course, among others, bringing harm to flora and fauna of these environments. As a way to compensating these damages, the CESP has acquired a region that was influenced by Srgio Motta Hydroelectric Plant Engineer, or Porto Primavera, and turned it into Reserva Particular do Patrimnio Natural Foz do Rio Aguape. By law it fits in a Conservation Unit, and thus should be contemplate for a management plan, ie, a multidisciplinary technical document which allows, simply, the practice of actions within and around in a sustainably way. This work aimed at developing a land cover map of the reserve for this plan can be made and executed more efficiently. Initially, the project included field visits and meetings with members of the CESP to be specified classes contained on the map. Later, we ran different types of classifications of multispectral images (TM / Landsat 5)... (Complete abstract click electronic access below)

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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)

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Reservoirs are artificial environments built by humans, and the impacts of these environments are not completely known. Retention time and high nutrient availability in the water increases the eutrophic level. Eutrophication is directly correlated to primary productivity by phytoplankton. These organisms have an important role in the environment. However, high concentrations of determined species can lead to public health problems. Species of cyanobacteria produce toxins that in determined concentrations can cause serious diseases in the liver and nervous system, which could lead to death. Phytoplankton has photoactive pigments that can be used to identify these toxins. Thus, remote sensing data is a viable alternative for mapping these pigments, and consequently, the trophic. Chlorophyll-a (Chl-a) is present in all phytoplankton species. Therefore, the aim of this work was to evaluate the performance of images of the sensor Operational Land Imager (OLI) onboard the Landsat-8 satellite in determining Chl-a concentrations and estimating the trophic level in a tropical reservoir. Empirical models were fitted using data from two field surveys conducted in May and October 2014 (Austral Autumn and Austral Spring, respectively). Models were applied in a temporal series of OLI images from May 2013 to October 2014. The estimated Chl-a concentration was used to classify the trophic level from a trophic state index that adopted the concentration of this pigment-like parameter. The models of Chl-a concentration showed reasonable results, but their performance was likely impaired by the atmospheric correction. Consequently, the trophic level classification also did not obtain better results.

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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)

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The objectives of this study were to evaluate land use and occupation of Permanent Preservation Areas (PPA) as well as its use conflicts by TM (Thematic Mapper) image of the 2010 Landsat-5 satellite, according to the Forest Code. For that purpose, Geographic Information Systems in the Ribeiro Paraso watershed, So Manuel, SP were used. The combination of Remote Sensing and Geographic Information System technologies allowed representation of spatial distribution of the landscape and data integration in the diagnosis of geographic interest. The 2010 mapping showed 12 use categories, and the sugar cane crop had the largest land occupation, 48.25% of the area. The areas of permanent preservation amounted to 925.74 ha, which is an ideal value based on the Brazilian legislation. Mapping of land use conflicts showed intensive anthropic actions going 80.13% forward on PPAs, with only 19.87% remaining forests, which highlights their negative impact and illegal situations in these areas.