Sar Imagery
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. 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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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
Publicado em: 2010
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3. 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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4. 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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5. Estruturas tectônicas cenozóicas na porção leste da Bacia Potiguar - RN
This thesis encompasses the integration of geological, geophysical, and seismological data in the east part of the Potiguar basin, northeastern Brazil. The northeastern region is located in South American passive margin, which exhibits important areas that present neotectonic activity. The definition of the chronology of events, geometry of structures genera
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. 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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9. Interpretação de dados de sensores remotos e dados aerogeofisicos como ferramenta na analise estrutural da area centro-oeste do sistema transcorrente Carajas (PA) / Remote sensing and aero-geophysical datas interpretation as a tool for structural analysis of the central-western region of the Carajas Strike-Slip System
The central-western region of the Carajás Strike-Slip Fault System comprises several mineral deposits currently under exploitation by the Vale do Rio Doce Mining Company. The geological and structural understanding of this region favors prospective initiatives within the Carajás Mineral Province. Remote sensing imagery, such as JERS-1/SAR, R-99B/SAR and La
Publicado em: 2005
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10. 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
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11. Classificação textural de imagens radarsat-1 para discriminação de alvos agrícolas. / Agricultural targets discrimination by textural classification of radarsat-1 imagery.
As imagens de sensoriamento remoto da faixa do visível e infravermelho do espectro eletromagnético apresentam grande potencial na identificação e discriminação de áreas agrícolas para fins de estimativa de safra. Contudo, a presença de nuvens impede a aquisição deste tipo de imagens. Já as imagens obtidas na faixa espectral de microondas por rada
Publicado em: 2004
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12. Detecção de manchas de óleo na superfície do mar por meio de técnicas de classificação textural de imagens de radar de de abertura sintética (Radarsat-1) / Oil spill detection at the sea surface by textural classification techniques of synthetic aperture radar images (Radarsat-1)
A procura por reservas de petróleo ao longo de plataformas continentais tem sido realizada, ao longo dos anos, em águas cada vez mais profundas, sendo que o petróleo cru e seus derivados são transportados por um número crescente de navios e oleodutos submarinos através dos oceanos. Como resultado destas atividades, o derramamento de óleo se mostra com
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2000