5 research outputs found

    Caracterização de Fitofisionomias Urbanas Usando NDVI em Imagens de Satélite e Software Livre

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    These paper reports applications using satellite images to the identification of vegetation types in the Campo Grande city. This identification allows studies of urban vegetation, palynology and environmental changes. Images from Landsat 8 and Rapideye satellites from the Campo Grande urban area were used. A soil coverage map was done for each one of the seven sub-regions. The Normalized Difference Vegetation Index was applied. In addition, a field survey was carried out to confirm the vegetation types sites through satellite images. Satellite images and in situ data validation allowed the distinction of the following features: water, urban structure, herbaceous, open and dense vegetation. For the identification of urban vegetation, Rapideye images were the most suitable for this type of study. The Rapideye satellite sensor detected 6.55% more dense vegetation area than Landsat 8 images

    Caracterização climática e estudo de tendências nas séries temporais de temperatura do ar e precipitação em Taubaté (SP)

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    Este trabalho tem por objetivos apresentar as principais características da distribuição temporal da precipitação e da temperatura do ar em Taubaté (SP), além de estabelecer uma caracterização do período da estação chuvosa, bem como verificar a ocorrência de tendências nas séries temporais desses dois elementos climáticos por meio do teste não paramétrico sazonal de Mann-Kendall. Devido à relativa variabilidade interanual da precipitação, não se verificaram tendências significativas no seu valor médio anual. Contudo, as análises da série temporal de 1983 a 2005 mostraram tendência de aumento das chuvas no mês de novembro, redução em abril e uma diminuição do número de dias por ano sem precipitação. Observou-se que o início da estação chuvosa em Taubaté ocorre em meados de setembro e o final acontece em meados de abril

    PREVISÕES TRADICIONAIS DE TEMPO E CLIMA NO CEARÁ: O CONHECIMENTO POPULAR À SERVIÇO DA CIÊNCIA / Traditional weather and climate forecasts in Ceará: lay knowledge in the service of science

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    This article examines the meteorological interpretations of phenomenon that are made bycareful observers of nature. The climate forecasts, made by the sertanejos and based onempirical observations, have relevance for the probability-based climate forecasts developedby meteorological institutions. In 1998 research was carried out in six different municípiosand microclimates during the months of January and February. A total of 484 householdinterviews were conducted. One research objective was to better understand the lay methodsinvolved in developing weather and climate forecasts. Both the lay forecasts as well as theinstitutional forecasts are incomplete and constantly improving. Increasing our understandingof how empirically based forecasts are used by the sertanejos is one way to influence the acceptance of other methods of predicting climatic conditions.Keywords
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