Cloud Cover
Mostrando 1-12 de 35 artigos, teses e dissertações.
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1. High-resolution topography for Digital Terrain Model (DTM) in Keller Peninsula, Maritime Antarctica
Abstract High resolution topography (HRT) surveys is an important tool to model landscapes, especially in zones subjected to strong environmental changes, such as Antarctica, where landform is highly influenced by cryoclasty and permafrost melting. The aim of this work was to obtain a high accurate DTM for Keller Peninsula, Maritime Antarctica. The survey st
An. Acad. Bras. Ciênc.. Publicado em: 26/07/2018
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2. TEMPORAL VARIABILITY IN ACTIVE REFLECTANCE SENSOR-MEASURED NDVI IN SOYBEAN AND WHEAT CROPS
ABSTRACT: Optimization of N management is one of the great challenges to be overcome in grain production, as it is directly related to productivity and can also cause environmental damage. Precision agriculture aims to solve this problem by applying nitrogen fertilizer at varying rates. Reflectance sensors are instruments capable of estimating N needs in var
Eng. Agríc.. Publicado em: 2017-08
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3. Influence of seasonal variation on the hydro-biogeochemical characteristics of two upland lakes in the Southeastern Amazon, Brazil
ABSTRACT Limnological characteristics of the Violão and Amendoim lakes, in the Serra dos Carajás, Amazon, were studied interannually (2013-2014). Climate data indicate anomalous conditions during the 2013 rainy period with higher rainfall and lower temperature in the beginning (November). Lake levels were influenced after the first and second hour of each
An. Acad. Bras. Ciênc.. Publicado em: 2016-12
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4. Floristic composition and phytogeography of the tree component of Araucaria Forest fragments in southern Brazil
The present study examined the floristic composition of three fragments of Araucaria Forest (AF) in the Planalto Catarinense region of southern Brazil as well as the floristic contextualization of these areas in relation to other remnant AF sites. Three AF fragments at different altitudes were analyzed in the municipalities of Campos Novos, Lages, and Painel
Braz. J. Bot.. Publicado em: 2012
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5. Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira / TerraSAR-X image for classification the land use and land cover in the southwest portion of the Brazilian Amazon
The objective of this study is to analyze the potential use of images from satellite TerraSAR-X, at StripMap acquisition mode, to map and identify the land use and land cover (LULC) in the southwestern Brazilian Amazon. Classifiers based on statistical functions for maximum likelihood (ML) method and based on frequency-based contextual and neural network cla
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2011
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6. Soy production area estimates in Mato Grosso, Brazil, using MODIS NDVI time series.
Brazil is the second largest soy producer in the world, with an estimated crop of 57 million tons in 2008/2009 season (CONAB). Total planted area accounted for 21.7 million ha, 26% of which is located in Mato Grosso state (MT). Given the large extent of Brazilian soy production and its economical impact for both national and international markets, crop area
MEETING OF THE AMERICAN. Publicado em: 2011
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7. Environmental drivers of leaf phenology in trees of the tropical species Ficus obtusifolia
Vegetative as well as reproductive phenology of tropical trees frequently occur synchronously at the end of the dry season. It has been repeatedly observed on two individuals of the tropical species Ficus obtusifolia growing in Caracas that they lose their entire foliage in a period of 48 h during the dry season and renew it within the next 72 h. In order to
Brazilian Journal of Plant Physiology. Publicado em: 2011
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8. Análise dos dados ALOS/PALSAR (modo de imageamento FBD) para identificação dos tipos de cobertura da terra na região norte do estado do Mato Grosso / Analysis of ALOS/PALSAR data (FDB mode) to identification land cover types in north region of Mato Grosso State
The Amazon forest is the largest rainforest of the planet and concentrates great biodiversity and natural resources. The continuous human impacts are occurring due to the occupation and exploitation of the region, then becoming essential to understand and to monitor the land cover changes. The intense cloud coverage in this region makes the use of optical im
Publicado em: 2009
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9. Assessment of polarimetric ALOS PALSAR data for Amazon land cover classification / Avaliação de dados polarimétricos do sensor ALOS PALSAR para classificação da cobertura da terra da Amazônia
Amazon Forest is considered the largest tropical forest of the planet. It keeps considerable part of the biodiversity and has great importance to the biogeochemistry cycles. The anthropic actions cause destructive processes such as deforestations and burnings, which can provoke unbalances on the ecosystem. This scenario highlights the importance of the monit
Publicado em: 2009
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10. Crop discrimination using harmonic analysis of EVI MODIS time-series data / Discriminação de culturas agrícolas utilizando análise harmônica de séries temporais de dados EVI-MODIS
In the present decade, agriculture has increased worldwide in importance due to sensitive matters such as the current food crisis, biofuels boom, and the land use and land cover changes from savanna/forest areas to agriculture expansion. As a consequence, crop monitoring at regional and national scales has become essential at different levels of knowledge an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/06/2008
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11. The meson cloud and the strange form factors of the proton / A nuvem mesônica e os fatores de forma estranhos do próton
The goal of this work was to include the scalar $\kappa$ meson on the meson cloud of the proton, and then to verify if the strangeness contribution to the electromagnetic properties of the proton could be explained by the meson cloud model. The observables that quantify such a contribution are the electric ($G_E^s$) and magnetic ($G_M^s$) strange form factor
Publicado em: 2008
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12. Análise metodológica do tratamento de dados sar r99b para discriminar incremento de desflorestamento no sudoeste da amazônia brasileira
- The estimate and mapping of deforestation in Brazilian Amazon has been carried out yarly, with the objective to monitor the forest resources, and as a mean for giving support to governmental control actions. This systematic monitoring is executed by the PRODES Digital project, developed by the Brazilian National Institute for Space Research (INPE), using L
Publicado em: 2008