Radar Imagery
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. Use of hydrogeophysical data to determine the role of faults in the geometry of the Barreiras Aquifer, Brazil
Abstract Characterizing the geometry of an aquifer is fundamental for determining the locations of more productive wells. Commonly, flow and hydraulic parameters, such as transmissivity, are related to the thickness of the aquifer, which emphasizes the importance of regional hydrogeophysical characterization. Shuttle radar imagery, well profiles and geoelect
Braz. J. Geol.. Publicado em: 27/06/2019
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2. Multi-channel azimuth processing in SAR images with emphasis on channel balancing alternatives.
Due to the widespread acceptance of Synthetic Aperture Radar (SAR) imagery by the scientific community in recent years, SAR system design faces ever increasing demands for wide coverage of high resolution images. This represents a challenging task, since conventional monostatic SAR system are inherently subject to a compromise between the achievable resoluti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/12/2010
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3. Multi-channel azimuth processing in SAR images with emphasis on channel balancing alternatives.
Due to the widespread acceptance of Synthetic Aperture Radar (SAR) imagery by the scientific community in recent years, SAR system design faces ever increasing demands for wide coverage of high resolution images. This represents a challenging task, since conventional monostatic SAR system are inherently subject to a compromise between the achievable resoluti
Publicado em: 2010
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4. Non-parametric edge detection in speckled imagery
This thesis proposes a non-parametric technique for boundary detection in speckled imagery. Synthetic Aperture Radar (SAR), sonar, B-ultrasound and laser imagery is corrupted by a signal-dependent non-additive noise called speckle. Several statistical models have been proposed to describe such a noise, thus of specialized techniques for image improvement and
Publicado em: 2008
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5. Modeling synthetic aperture radar image data
In this thesis we study maximum likelihood estimation (MLE) of the roughness parameter of the G 0 A distribution for speckled imagery (Frery et al., 1997). We discover that when a certain criteria is satisfied by the sample moments, the likelihood function is monotone and MLE estimates are infinite, implying an extremely homogeneous region. We implement four
Publicado em: 2008
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6. Evaluation of digital terrain model extracted from SAR data in X-Band of SAR R-99B / Avaliação do Modelo Digital do Terreno Extraído de Dados SAR Interferométricos na Banda X do SAR R-99B
In the Brazilian territory there are several areas with no topographic mapping coverage and the existent maps are not updated due to the continuous land use and land cover changes. The Sistema de Prote¸cao da Amazonia (SIPAM) uses airplanes with synthetic aperture radar which allows to image in several conditions. This radar was designed for recoinassance t
Publicado em: 2007
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7. Caracterização e estimativa de biomassa em fitofisionomias de terra-firme da amazônia central por inventário florístico e por textura de imagens simulação do mapsar (Multi-Application Purpose SAR) / Phytophysionomic characterization and biomass estimation of a central amazon upland forest from floristic inventory and texture of images from simulated mapsar (Multi-Application Purpose SAR)
Sob a premissa de que nas florestas de terra firme da Amazônia Central a variação florística e estrutural sofrem influência do relevo e da proximidade da rede de drenagem, este estudo teve o objetivo de: 1) descrever a composição florística e a estrutura horizontal e vertical ao longo da toposequência; 2) desenvolver modelos preditivos de biomassa a
Publicado em: 2007
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8. Geomorphological and physiographical characterization of João Pessoa Chart - 1: 100.000 / Caracterização geomorfológica e do meio físico da folha João Pessoa - 1:100.000
This work encompasses an extensive physiographical characterization of the João Pessoa Chart 1: 100.000, wherein the landforms, although linked to other natural components, represent the main focus of the thesis. From the geomorphological perspective, the study area lies on the coastal tablelands (Tabuleiros) and coastal lowlands of Northeastern Brazil, bei
Publicado em: 2007
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9. Rainfall estimation in tropical regions using GOES-12 satellite imagery / Estimativa de precipitação em regiões tropicais utilizando imagens do satelite GOES 12
Das variáveis que compõem o balanço hídrico, a precipitação é, certamente, o fator natural determinante da produção agrícola no país. A deficiência hídrica afeta praticamente todos os aspectos relacionados ao desenvolvimento e produtividade das culturas agrícolas. Por outro lado, o excesso de precipitação também pode influenciar negativament
Publicado em: 2006
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10. Avaliação de modelos digitais de elevação gerados a partir de sensores remotos orbitais ópticos (ASTER) e radar (RADARSAT-1, SRTM): um estudo para a região da Serra dos Carajás (PA) / Evaluation of digital elevation models generated from optical (ASTER) and radar (radarsat-1, SRTM) orbital remote sensors: a study for the area of the montain of Carajás (PA)
Grandes áreas do território Brasileiro ainda apresentam falta de informação planialtimétrica nas escalas de semidetalhe (1:100.000) e de detalhe (1:50.000), principalmente nas regiões Norte e Nordeste. Além disso, quando disponíveis as cartas topográficas estão desatualizados e com uma pobre qualidade altimétrica. Modelos Digitais de Elevação (D
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2005
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11. Segmentação multi-níveis e multi-modelos para imagens de radar e ópticas / Multi-levels and multi-models segmentations for radar and optical images
This research presents an innovative automatic segmentation method (SegSAR) designed for radar and optical satellite imagery. The design of SegSAR is innovative because it encompasses (i) several common segmentation techniques such as region growing and merging, edge detection, and minimum area and homogeneity test, which are integrated in a pyramidal compre
Publicado em: 2005
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12. Classificação textural de imagens radarsat-1 para discriminação de alvos agrícolas. / Agricultural targets discrimination by textural classification of radarsat-1 imagery.
Remote sensing images from the visible and infrared regions of the electromagnetic spectrum have demonstrated a great potential to identify and discriminate agricultural areas for crops estimation. However, cloud cover is an obstruction for this type of image acquisition. On the other hand, Synthetic Aperture Radar (SAR) images acquired in the microwave regi
Publicado em: 2004