for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> EARTH SCIENCES (Total: 667 journals)
    - EARTH SCIENCES (469 journals)
    - GEOLOGY (80 journals)
    - GEOPHYSICS (27 journals)
    - HYDROLOGY (24 journals)
    - OCEANOGRAPHY (67 journals)

EARTH SCIENCES (469 journals)                  1 2 3 | Last

Showing 1 - 200 of 371 Journals sorted alphabetically
Acta Geochimica     Hybrid Journal   (Followers: 6)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 2)
Acta Geodaetica et Geophysica Hungarica     Full-text available via subscription   (Followers: 2)
Acta Geophysica     Open Access   (Followers: 10)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3)
Advances in High Energy Physics     Open Access   (Followers: 18)
Advances In Physics     Hybrid Journal   (Followers: 19)
Aeolian Research     Hybrid Journal   (Followers: 6)
African Journal of Aquatic Science     Hybrid Journal   (Followers: 13)
Algological Studies     Full-text available via subscription   (Followers: 1)
Alpine Botany     Hybrid Journal   (Followers: 5)
AMBIO     Hybrid Journal   (Followers: 11)
Anales del Instituto de la Patagonia     Open Access  
Andean geology     Open Access   (Followers: 9)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales UMCS, Geographia, Geologia, Mineralogia et Petrographia     Open Access  
Annals of Geophysics     Open Access   (Followers: 13)
Annals of GIS     Hybrid Journal   (Followers: 20)
Annual Review of Marine Science     Full-text available via subscription   (Followers: 10)
Anthropocene     Hybrid Journal   (Followers: 4)
Anthropocene Review     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Geochemistry     Hybrid Journal   (Followers: 14)
Applied Geomatics     Hybrid Journal   (Followers: 3)
Applied Geophysics     Hybrid Journal   (Followers: 8)
Applied Ocean Research     Hybrid Journal   (Followers: 8)
Applied Petrochemical Research     Open Access   (Followers: 3)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 36)
Arctic Science     Open Access   (Followers: 6)
Arctic, Antarctic, and Alpine Research     Full-text available via subscription   (Followers: 9)
Artificial Satellites : The Journal of Space Research Centre of Polish Academy of Sciences     Open Access   (Followers: 20)
Asia-Pacific Journal of Atmospheric Sciences     Hybrid Journal   (Followers: 19)
Asian Journal of Earth Sciences     Open Access   (Followers: 19)
Asian Review of Environmental and Earth Sciences     Open Access   (Followers: 2)
Atlantic Geology : Journal of the Atlantic Geoscience Society / Atlantic Geology : revue de la Société Géoscientifique de l'Atlantique     Full-text available via subscription   (Followers: 9)
Atmosphere-Ocean     Full-text available via subscription   (Followers: 12)
Atmospheric and Climate Sciences     Open Access   (Followers: 25)
Australian Journal of Earth Sciences: An International Geoscience Journal of the Geological Society of Australia     Hybrid Journal   (Followers: 10)
Boletim de Ciências Geodésicas     Open Access  
Bonorowo Wetlands     Open Access  
Boreas: An International Journal of Quaternary Research     Hybrid Journal   (Followers: 11)
Bragantia     Open Access   (Followers: 2)
Bulletin of Earthquake Engineering     Hybrid Journal   (Followers: 11)
Bulletin of Geosciences     Open Access   (Followers: 8)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Seismological Society of America     Full-text available via subscription   (Followers: 21)
Bulletin of Volcanology     Hybrid Journal   (Followers: 21)
Cadernos de Geociências     Open Access  
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 20)
Carbonates and Evaporites     Hybrid Journal   (Followers: 2)
CATENA     Hybrid Journal   (Followers: 8)
Chemical Geology     Hybrid Journal   (Followers: 23)
Chemie der Erde - Geochemistry     Hybrid Journal   (Followers: 5)
Chinese Geographical Science     Hybrid Journal   (Followers: 5)
Chinese Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 4)
Ciencia del suelo     Open Access   (Followers: 2)
Ciencias Espaciales     Open Access  
Climate and Development     Hybrid Journal   (Followers: 12)
Coastal Management     Hybrid Journal   (Followers: 25)
Cogent Geoscience     Open Access  
Comptes Rendus Geoscience     Full-text available via subscription   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 3)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Contemporary Trends in Geoscience     Open Access   (Followers: 2)
Continental Shelf Research     Hybrid Journal   (Followers: 9)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 12)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 4)
Coral Reefs     Hybrid Journal   (Followers: 18)
Cretaceous Research     Hybrid Journal   (Followers: 11)
Cybergeo : European Journal of Geography     Open Access   (Followers: 5)
Depositional Record     Open Access   (Followers: 1)
Developments in Geotectonics     Full-text available via subscription   (Followers: 2)
Developments in Quaternary Science     Full-text available via subscription   (Followers: 4)
Développement durable et territoires     Open Access   (Followers: 2)
Diatom Research     Hybrid Journal   (Followers: 3)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamics of Atmospheres and Oceans     Hybrid Journal   (Followers: 13)
E&S Engineering and Science     Open Access  
E3S Web of Conferences     Open Access   (Followers: 1)
Earth and Planetary Science Letters     Hybrid Journal   (Followers: 145)
Earth and Space Science     Open Access   (Followers: 14)
Earth Interactions     Full-text available via subscription   (Followers: 12)
Earth Science Frontiers     Full-text available via subscription   (Followers: 6)
Earth Science Research     Open Access   (Followers: 9)
Earth Surface Dynamics (ESurf)     Open Access   (Followers: 7)
Earth Surface Processes and Landforms     Hybrid Journal   (Followers: 20)
Earth System Dynamics     Open Access   (Followers: 7)
Earth System Dynamics Discussions     Open Access   (Followers: 4)
Earth's Future     Open Access   (Followers: 1)
Earth, Planets and Space     Open Access   (Followers: 67)
Earthquake Engineering and Engineering Vibration     Hybrid Journal   (Followers: 9)
Earthquake Science     Hybrid Journal   (Followers: 11)
Earthquake Spectra     Full-text available via subscription   (Followers: 21)
Ecohydrology     Hybrid Journal   (Followers: 9)
Ecological Questions     Open Access   (Followers: 3)
Electromagnetics     Hybrid Journal   (Followers: 8)
Energy Efficiency     Hybrid Journal   (Followers: 10)
Energy Exploration & Exploitation     Hybrid Journal   (Followers: 4)
Environmental Earth Sciences     Hybrid Journal   (Followers: 25)
Environmental Geology     Hybrid Journal   (Followers: 18)
Environmental Geosciences     Full-text available via subscription   (Followers: 5)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
Erwerbs-Obstbau     Hybrid Journal  
Estuaries and Coasts     Hybrid Journal   (Followers: 18)
Estuarine, Coastal and Shelf Science     Hybrid Journal   (Followers: 35)
Estudios Geográficos     Open Access  
European Journal of Mineralogy     Full-text available via subscription   (Followers: 15)
European Journal of Remote Sensing     Open Access   (Followers: 5)
Exploration Geophysics     Hybrid Journal   (Followers: 3)
Facies     Hybrid Journal   (Followers: 10)
Fieldiana Life and Earth Sciences     Full-text available via subscription   (Followers: 1)
Física de la Tierra     Open Access  
Folia Musei rerum naturalium Bohemiae occidentalis. Geologica et Paleobiologica     Open Access  
Folia Quaternaria     Open Access  
Forestry Chronicle     Full-text available via subscription   (Followers: 9)
Frontiers in Earth Science     Open Access   (Followers: 5)
Frontiers in Geotechnical Engineering     Open Access   (Followers: 3)
Frontiers of Earth Science     Hybrid Journal   (Followers: 8)
Fundamental and Applied Limnology / Archiv für Hydrobiologie     Full-text available via subscription   (Followers: 4)
GEM - International Journal on Geomathematics     Hybrid Journal   (Followers: 1)
Geo-Marine Letters     Hybrid Journal   (Followers: 6)
Geoacta     Open Access   (Followers: 2)
Geobiology     Hybrid Journal   (Followers: 8)
Geocarto International     Hybrid Journal   (Followers: 22)
Geochemistry : Exploration, Environment, Analysis     Hybrid Journal   (Followers: 7)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 30)
Geochimica et Cosmochimica Acta     Hybrid Journal   (Followers: 52)
Geochronometria     Hybrid Journal   (Followers: 2)
Geoderma Regional : The International Journal for Regional Soil Research     Full-text available via subscription   (Followers: 4)
Geodinamica Acta     Open Access   (Followers: 2)
Geodynamics & Tectonophysics     Open Access   (Followers: 2)
Geoenvironmental Disasters     Open Access   (Followers: 3)
Geofluids     Open Access   (Followers: 4)
Geoforum     Hybrid Journal   (Followers: 25)
Géographie physique et Quaternaire     Full-text available via subscription   (Followers: 1)
Geography and Natural Resources     Hybrid Journal   (Followers: 7)
Geoheritage     Hybrid Journal   (Followers: 1)
Geoinformatica Polonica : The Journal of Polish Academy of Arts and Sciences     Open Access  
Geoinformatics & Geostatistics     Hybrid Journal   (Followers: 11)
Geological Journal     Hybrid Journal   (Followers: 17)
Geological Magazine     Hybrid Journal   (Followers: 16)
Geology Today     Hybrid Journal   (Followers: 28)
Geology, Geophysics and Environment     Open Access   (Followers: 2)
Geomagnetism and Aeronomy     Hybrid Journal   (Followers: 3)
Geomatics, Natural Hazards and Risk     Hybrid Journal   (Followers: 11)
Geomechanics for Energy and the Environment     Full-text available via subscription   (Followers: 1)
GEOmedia     Open Access   (Followers: 1)
Geomorphology     Hybrid Journal   (Followers: 30)
Geophysical & Astrophysical Fluid Dynamics     Hybrid Journal   (Followers: 2)
Geophysical Journal International     Hybrid Journal   (Followers: 34)
Geophysical Prospecting     Hybrid Journal   (Followers: 7)
Geophysics     Full-text available via subscription   (Followers: 20)
GeoResJ     Hybrid Journal  
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards     Hybrid Journal   (Followers: 9)
Geoscience Canada : Journal of the Geological Association of Canada / Geoscience Canada : journal de l'Association Géologique du Canada     Full-text available via subscription   (Followers: 6)
Geoscience Data Journal     Open Access   (Followers: 2)
Geoscience Frontiers     Open Access   (Followers: 9)
Geoscience Letters     Open Access  
Geoscience Records     Open Access  
Geosciences     Open Access   (Followers: 1)
Geosciences Journal     Hybrid Journal   (Followers: 9)
Geoscientific Instrumentation, Methods and Data Systems     Open Access   (Followers: 4)
Geoscientific Model Development     Open Access   (Followers: 2)
Geostandards and Geoanalytical Research     Hybrid Journal   (Followers: 2)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotectonic Research     Full-text available via subscription   (Followers: 4)
Geotectonics     Hybrid Journal   (Followers: 7)
GISAP : Earth and Space Sciences     Open Access   (Followers: 1)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
Global and Planetary Change     Hybrid Journal   (Followers: 16)
Global Biogeochemical Cycles     Full-text available via subscription   (Followers: 18)
Gondwana Research     Hybrid Journal   (Followers: 9)
GPS Solutions     Hybrid Journal   (Followers: 23)
Grassland Science     Hybrid Journal  
Ground Water     Hybrid Journal   (Followers: 36)
Ground Water Monitoring & Remediation     Hybrid Journal   (Followers: 18)
Groundwater for Sustainable Development     Full-text available via subscription   (Followers: 3)
Helgoland Marine Research     Open Access   (Followers: 3)
History of Geo- and Space Sciences     Open Access   (Followers: 1)
Hydrobiologia     Hybrid Journal   (Followers: 18)
Hydrogeology Journal     Hybrid Journal   (Followers: 20)
Hydrological Processes     Hybrid Journal   (Followers: 30)
Hydrology and Earth System Sciences     Open Access   (Followers: 29)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 51)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Indian Geotechnical Journal     Hybrid Journal   (Followers: 4)
Indonesian Journal on Geoscience     Open Access   (Followers: 2)
Interdisciplinary Environmental Review     Hybrid Journal   (Followers: 3)
International Geology Review     Hybrid Journal   (Followers: 14)
International Journal of Advanced Geosciences     Open Access   (Followers: 2)
International Journal of Advanced Remote Sensing and GIS     Open Access   (Followers: 39)
International Journal of Advancement in Earth and Enviromental Sciences     Open Access   (Followers: 5)
International Journal of Advancement in Remote Sensing, GIS, and Geography     Open Access   (Followers: 31)
International Journal of Applied Earth Observation and Geoinformation     Hybrid Journal   (Followers: 34)
International Journal of Coal Geology     Hybrid Journal   (Followers: 3)
International Journal of Disaster Risk Reduction     Hybrid Journal   (Followers: 18)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)

        1 2 3 | Last

Journal Cover Boletim de Ciências Geodésicas
  [SJR: 0.227]   [H-I: 5]   [0 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1413-4853 - ISSN (Online) 1982-2170
   Published by SciELO Homepage  [714 journals]
  • OBJECT-BASED ANALYSIS FOR URBAN LAND COVER MAPPING USING THE INTERIMAGE
           AND THE SIPINA FREE SOFTWARE PACKAGES

    • Abstract: : In this work we introduce an object-based method, applied to urban land cover mapping. The method is implemented with two open-source tools: SIPINA, a data mining software package; and InterIMAGE, an object-based image analysis system. Initially, segmentation, feature extraction and sample selection procedures are performed with InterIMAGE. In order to reduce the time and subjectivity involved to develop the decision rules in InterIMAGE, a data mining step is then carried out with SIPINA. In sequence, the decision trees delivered by SIPINA are analysed and encoded into InterIMAGE decision rules for the final classification step. Experiments were conducted using a subset of a GeoEye image, acquired in January 01, 2013, covering the urban portion of the municipality of Goianésia, Brazil. Five decision tree induction algorithms, available in SIPINA, were tested: ID3, C45, GID3, Assistant86 and CHAID. The TAU and Kappa coefficients were used to evaluate the results. The TAU values obtained were in the range of 0.66 and 0.70, while those for Kappa varied from 0.65 to 0.69.Resumo: Apresentamos neste trabalho um método para o mapeamento do uso do solo urbano, implementado com duas ferramentas de código aberto: SIPINA, um pacote de software de mineração de dados; e o InterIMAGE, um sistema de análise de imagens de sensoriamento remoto baseado em objetos. Inicialmente procedimentos de segmentação, extração de atributos e seleção de amostras são realizados com o InterIMAGE. Com o objetivo de reduzir o tempo e a subjetividade envolvidos na definição de regras de decisão no InterIMAGE, um procedimento de mineração de dados é então realizado com a SIPINA. Na sequência, as árvores de decisão geradas através do SIPINA são analisadas e codificadas em regras de decisão do InterIMAGE para o procedimento final de classificação. Experimentos foram realizados sobre uma imagem GeoEye, recobrindo uma paisagem urbana do município de Goianésia, Brasil. Foram testados cinco algoritmos de indução de árvores de decisão disponíveis no SIPINA: ID3, C45, GID3, Assistant86 e CHAID. Os resultados foram avaliados através dos índices TAU e Kappa. Os valores de TAU obtidos variaram entre 0.66 e 0.70, e os valores de Kappa variaram entre 0.65 e 0.69.
       
  • PRECISE FORMULA FOR VOLUME COMPUTATIONS USING CONTOURS METHOD

    • Abstract: : Except some special cases, commonly used volume computation methods are grids method, contours method and volume computations by utilizing TIN (Triangulated Irregular Network). In this study, to investigate the precisions of these techniques, a grid system is established in an undulating area and volume of the mound is determined by using these three volume computation methods. It is found out that contour method results were not as price as the other two methods. Thus, a precise formula for volume computations using contours method is proposed.Resumo: Exceto em alguns casos especiais, os métodos de cálculo de volume utilizam grids, curvas de nível e volume, por meio de TIN (Triangulated Irregular Network). Neste estudo, para avaliar a precisão destes métodos, um sistema de grid foi estabelecido em uma área e o volume foi calculado utilizando as três formas citadas. Concluiu-se que o método das curvas não obteve resultados tão bons quanto os demais. Assim, propõe-se uma fórmula precisa para cálculo de volume utilizando as curvas.
       
  • MAPPING OF FLOOD SUSCEPTIBILITY IN CAMPINA GRANDE COUNTY - PB: A SPATIAL
           MULTICRITERIA APPROACH

    • Abstract: : The social and economic impacts caused by floods in urban areas are diverse and increase as the land becomes gradually impervious. Due to the increasing urbanization of cities, it is necessary to implement a better planning process and optimize the urban spaces management and occupation. Thus, the government needs to gather reliable and useful data for the decision-making process. Therefore, the GIS plays an important role among urban planning instruments. Given the current situation in Campina Grande County, Paraiba State, Brazil - an area continually facing disturbances caused by occasional and concentrated rainfalls - the current study aims to map the areas seen as the most susceptible to floods, by using a MCDA GIS-based model (Multi-Criteria Decision Analysis). There are five quantitative criteria considered in the analysis: slope, altitude, roads with drainage infrastructure, distance from water bodies and land use. It is a pixel by pixel analysis based on predetermined assumptions. Fuzzy functions were developed and overlay operations were performed. The results were consistent with historical records and with previous studies about the county, thus adding reliability to the model, which can be considered a potential management instrument for the case study area, as well as for cities facing similar issues.Resumo: Os impactos sociais e econômicos que alagamentos podem causar em áreas urbanas são diversos e aumentam à medida que o solo é impermeabilizado. O aumento de urbanização das cidades, torna necessário implementar um melhor processo de planejamento e otimizar a gestão do espaço urbano e sua ocupação. Para isso, as gestões precisam de dados confiáveis e úteis para a tomada de decisão. Assim, os Sistemas de Informação Geográfica (SIG) têm papel importante entre os mecanismos de planejamento urbano. Diante da atual situação do município de Campina Grande, Paraíba - Brasil, palco de transtornos de chuvas esporádicas e concentradas, esse estudo objetivou mapear as áreas mais susceptíveis a ocorrência de alagamentos através de um modelo baseado em SIG e MCDA (Multi-Criteria Decision Analysis). Consideraram-se cinco critérios quantitativos: declividade, altitude, vias com drenagem, distância a corpos hídricos e uso do solo. A análise ocorreu pixel a pixel baseada em premissas pré-determinadas, foram criadas funções de pertinência Fuzzy e efetuadas operações de sobreposição (overlay). Os resultados foram compatíveis com registros históricos, levantamentos oficiais e estudos prévios elaborados para a cidade, agregando confiabilidade ao modelo. Este pode ser considerado como um instrumento de gestão para o caso estudado e para cidades com problemas similares.
       
  • ERRORS MEASUREMENT OF INTERPOLATION METHODS FOR GEOID MODELS: STUDY CASE
           IN THE BRAZILIAN REGION

    • Abstract: : The geoid is an equipotential surface regarded as the altimetric reference for geodetic surveys and it therefore, has several practical applications for engineers. In recent decades the geodetic community has concentrated efforts on the development of highly accurate geoid models through modern techniques. These models are supplied through regular grids which users need to make interpolations. Yet, little information can be obtained regarding the most appropriate interpolation method to extract information from the regular grid of geoidal models. The use of an interpolator that does not represent the geoid surface appropriately can impair the quality of geoid undulations and consequently the height transformation. This work aims to quantify the magnitude of error that comes from a regular mesh of geoid models. The analysis consisted of performing a comparison between the interpolation of the MAPGEO2015 program and three interpolation methods: bilinear, cubic spline and neural networks Radial Basis Function. As a result of the experiments, it was concluded that 2.5 cm of the 18 cm error of the MAPGEO2015 validation is caused by the use of interpolations in the 5'x5' grid.Resumo: O geoide é a superfície equipotencial de referência altimétrica para levantamentos cartográficos e, portanto, apresenta diversas finalidades práticas para o engenheiro. Nas últimas décadas a comunidade geodésica tem concentrado esforços no desenvolvimento de modelos geoidais altamente acurados por meio de modernas técnicas. Esses modelos são fornecidos por meio de grades regulares das quais os usuários necessitam realizar interpolações. Todavia pouca informação pode ser obtida a respeito do método de interpolação mais adequado para extrair informação da malha regular de modelos geoidais. A utilização de um interpolador que não representa adequadamente a superfície geoidal pode prejudicar a qualidade das ondulações geoidais e consequentemente a conversão de altitudes. Este trabalho tem como objetivo quantificar a magnitude do erro proveniente da interpolação de malhas regulares de modelos geoidais. As análises consistiram na comparação entre os resultados obtidos com a interpolação do programa MAPGEO2015 e os interpoladores: bilinear, spline cúbica e redes neurais Radial Basis Function. De acordo com os experimentos realizados, concluiu-se que 2.5 cm dos 18 cm de erro obtido na validação do MAPGEO2015 é causado pelo uso dos interpoladores na grade 5'x5'.
       
  • MAPVOICE: COMPUTATIONAL TOOL TO AID IN LEARNING CARTOGRAPHY FOR THE
           VISUALLY IMPAIRED

    • Abstract: : In Brazil, the LDB - Law of Guidelines and Bases nº. 9394(Brazil, 1996) and the PCN - National Curricular Parameters, determines that the Geography discipline is recognized as autonomous and should not be understood as a complement to other disciplines. In this way, the improvement in Geography teaching passes through cartographic literacy. The focus is on offering the student the capacity to carry out the appropriation, analysis, reflection and criticism on geographical space. In this way, this paper presents a resource that consisted of the development of the application called MapVoice. The purpose of the software is to enable Blind or visually impaired students, from basic education, in the learning of Cartography in Geography classes. MapVoice provides the understanding and interpretation of physical environments transformed into thematic maps based on data from the 2010 Brazilian Demographic Census executed by IBGE. The software used sound and image resources developed for Windows environment. The research concludes that it is necessary to prepare the infrastructure of the schools for the reception of these students, but mainly the continuing training of teachers and teaching assistants. Mapvoice was tested at the Institute of the Blind for validation, achieving a satisfactory result and making enthusiasm for the development of new researches.Resumo: No Brasil, o LDB Lei de Diretrizes e Bases nº. 9394(Brazil, 1996) e o PCN - Parâmetros Curriculares Nacionais, determina que a disciplina de Geografia é reconhecida como autônoma e não deve ser entendida como complemento de outras disciplinas. Desta forma, a melhoria do ensino da Geografia passa pela alfabetização cartográfica. O foco é oferecer ao aluno a capacidade de realizar a apropriação, análise, reflexão e crítica sobre o espaço geográfico. Desta forma, este artigo apresenta um recurso que consistiu no desenvolvimento do aplicativo chamado MapVoice. O objetivo do software é habilitar os estudantes cegos ou deficientes visuais, da educação básica, na aprendizagem de cartografia em aulas de Geografia. MapVoice fornece a compreensão e interpretação de ambientes físicos transformados em mapas temáticos com base nos dados do Censo Demográfico Brasileiro de 2010 executado pelo IBGE. O software usou recursos de som e imagem desenvolvidos para o ambiente Windows. A pesquisa conclui que é necessário preparar a infra-estrutura das escolas para a recepção desses alunos, mas principalmente a formação contínua de professores e auxiliares de ensino. O Mapvoice foi testado no Instituto de Cegos para validação, conseguindo um resultado satisfatório e entusiasmando o desenvolvimento de novas pesquisas.
       
  • CLASSIFICATION OF LIDAR DATA OVER BUILDING ROOFS USING K-MEANS AND
           PRINCIPAL COMPONENT ANALYSIS

    • Abstract: : The classification is an important step in the extraction of geometric primitives from LiDAR data. Normally, it is applied for the identification of points sampled on geometric primitives of interest. In the literature there are several studies that have explored the use of eigenvalues to classify LiDAR points into different classes or structures, such as corner, edge, and plane. However, in some works the classes are defined considering an ideal geometry, which can be affected by the inadequate sampling and/or by the presence of noise when using real data. To overcome this limitation, in this paper is proposed the use of metrics based on eigenvalues and the k-means method to carry out the classification. So, the concept of principal component analysis is used to obtain the eigenvalues and the derived metrics, while the k-means is applied to cluster the roof points in two classes: edge and non-edge. To evaluate the proposed method four test areas with different levels of complexity were selected. From the qualitative and quantitative analyses, it could be concluded that the proposed classification procedure gave satisfactory results, resulting in completeness and correctness above 92% for the non-edge class, and between 61% to 98% for the edge class.Resumo: A classificação é uma importante etapa na extração de primitivas geométricas sobre dados LiDAR. Normalmente, a classificação é utilizada para identificar os pontos amostrados sobre primitivas de interesse. Na literatura são encontrados vários trabalhos que exploram o uso dos autovalores para classificar os pontos LiDAR em diferentes estruturas ou classes, tais como: quina, borda, e plano. Entretanto, alguns trabalhos desenvolvidos se baseiam em parâmetros obtidos a partir de uma geometria ideal, que pode fornecer resultados não adequados quando a amostragem for insuficiente ou quando da presença de ruídos. Para contornar esta limitação, é proposto o uso de métricas estimadas a partir de autovalores e do uso do método k-médias. O conceito de análise de componentes principais é utilizado para determinar os autovalores e algumas métricas derivadas, enquanto que o método k-médias é aplicado para agrupar os pontos de telhados em duas classes: borda e não borda. Para avaliar a metodologia foram selecionadas quatro áreas teste com diferentes níveis de complexidade. A partir dos resultados, foi possível concluir que o procedimento de classificação apresentou resultados satisfatórios, obtendo-se nível de acerto e completeza acima de 92% para os pontos da classe não borda e entre 61% e 98% para a classe borda.
       
  • A STUDY ON THE EFFECTS OF VIEWING ANGLE VARIATION IN SUGARCANE RADIOMETRIC
           MEASURES

    • Abstract: : Remote Sensing techniques, such as field spectroscopy provide information with a large level of detail about spectral characteristics of plants enabling the monitoring of crops. The aim of this study is to analyze the influence of viewing angle in estimating the Bidirectional Reflectance Distribution Function (BRDF) for the case of sugarcane. The study on the variation of the spectral reflectance profile can help the improvement of algorithms for correction of BRDF in remote sensing images. Therefore, spectral measurements acquired on nadir and different off-nadir view angle directions were considered in the experiments. Change both anisotropy factor and anisotropy index was determined in order to evaluate the BRDF variability in the spectral data of sugarcane. BRDF correction was applied using the Walthall model, thus reducing the BRDF effects. From the results obtained in the experiments, the spectral signatures showed a similar spectral pattern varying mainly in intensity. The anisotropy factor which showed a similar pattern in all wavelengths. The visual analysis of the spectral reflectance profile of sugarcane showed variation mainly in intensity at different angles. The use of Walthall model reduced the BRDF effects and brought the spectral reflectance profiles acquired on different viewing geometry close to nadir viewing. Therefore, BRDF effects on remote sensing data of vegetation cover can be minimized by applying this model. This conclusion contributes to developing suitable algorithms to produce radiometrically calibrated mosaics with remote sensing images taken by aerial platforms.Resumo: Técnicas de Sensoriamento Remoto, como a espectroscopia de campo fornecem informações mais detalhadas das características espectrais das plantas permitindo um melhor acompanhamento da cultura. O objetivo deste trabalho é analisar a influência do ângulo de visada na estimativa da Função de Distribuição de Reflectância Bidirecional (FDRB) no caso da cana-de-açúcar. Nesse sentido, foram avaliadas as variações decorrentes da mudança no ângulo de visada e conforme a região do espectro eletromagnético. O estudo da variação das curvas espectrais permite auxiliar o desenvolvimento de algoritmos para correção da FDRB em imagens de sensoriamento remoto. Portanto, as medições espectrais em ângulos no nadir e fora do nadir foram consideradas nos experimentos. O fator de anisotropia e o índice de anisotropia foram determinados com o objetivo de avaliar a variabilidade do BRDF nos dados espectrais da cana-de-açúcar. Aplicou-se o modelo de correção da FDRB de Walthall para reduzir os efeitos da FDRB nas curvas espectrais. Os resultados obtidos demonstraram que as assinaturas espectrais apresentaram forma similar variando principalmente a magnitude. O fator de anisotropia evidenciou um comportamento similar em todos os comprimentos de onda, assim como na análise visual das curvas espectrais da cana-de-açúcar, apresentando principalmente variação na intensidade nos diferentes ângulos de visada. Utilizando modelos como o de Walthall é possível reduzir o efeito da FRDB nas curvas espectrais aproximando as curvas para o nadir. Portanto, os efeitos da FRDB que ocorrem nos dados de sensoriamento remoto da vegetação podem ser minimizados pelo modelo. Esta conclusão contribui para o desenvolvimento de algoritmos adequados para produzir mosaicos calibrados radiometricamente a partir de imagens de sensoriamento remoto adquiridas por plataformas aéreas.
       
  • COMPARATIVE ANALYSIS OF BIOGAS GENERATION FOR THE SOLID WASTE SECTOR USING
           UNMANNED AERIAL VEHICLE WITH THE BRAZILIAN MODEL OF GREENHOUSE GAS
           EMISSIONS IN AREAS WITH NO OPERATIONAL HISTORY

    • Abstract: : The city of Volta Redonda, located in the state of Rio de Janeiro, has a controlled landfill of municipal solid waste (MSW) which was partially recovered in 2008. This disposal site has no data on the amount of waste volume landfilled. An Unmanned Aerial Vehicle (UAV) was used to capture images of the study area and through Geographic Information Systems (GIS) the biogas generation was determined. By overlaying the georeferenced images the contour lines were determined which enabled the creation of the 3D Digital Terrain Model (DTM) of the area with a resolution of 0.296349 m / pix. The DTM provided the determination of the volume of waste landfilled (535.755,79 m3) and the real surface area (36.770,96 m2) of the controlled landfill. These parameters allowed obtainment the maximum flow rate of methane generation of 16.539,82 m3 for 2007. The Brazilian model used to determination biogas generation in waste sector achieve a maximum flow rate of methane generation of 126.599,4 m3 for the year 2007. A significant difference between biogas generation in the two models was observed mainly due to the amount of waste determined in both models.Resumo: A cidade de Volta Redonda, localizada no estado do Rio de Janeiro, possui um aterro controlado de Resíduos Sólidos Municipais (RSM) que foi parcialmente recuperado em 2008. Este sítio de disposição não possui dados sobre a quantidade de volume de resíduos aterrados. Um veículo aéreo não tripulado (VANT) foi usado para capturar imagens da área de estudo e através de Sistemas de Informação Geográfica (GIS), foi determinada a geração de biogás. Ao sobrepor as imagens georreferenciadas foram determinadas as curvas de nível que possibilitaram a criação do Modelo Digital de Terreno 3D (MDT) da área com uma resolução de 0,296349 m / pix. O MDT proporcionou a determinação do volume de resíduos aterrados (535.755,79 m3) e da área de superfície real (36.770,96 m2) do aterro controlado. Estes parâmetros permitiram a obtenção da taxa de fluxo máximo de geração de metano de 16.539,82 m3 para 2007. O modelo brasileiro utilizado para a determinação da geração de biogás atingiu uma taxa de fluxo máximo de geração de 126.599,4 m3 para o ano de 2007. Uma diferença significativa entre a geração de biogás nos dois modelos foi observada, devido principalmente à quantidade de resíduos estimada nos dois modelos.
       
  • LANDSLIDE HAZARD MAPPING NEAR THE ADMIRAL ÁLVARO ALBERTO NUCLEAR COMPLEX,
           RIO DE JANEIRO, BRAZIL.

    • Abstract: : Technological accidents can be vast in scope and require a rapid response to evacuate the affected region. Access routes to nuclear power stations are essential for the preparation of emergency plans in the event of technological disasters. The Admiral Álvaro Alberto Nuclear Power Plant (Central Nuclear Almirante Álvaro Alberto - CNAAA) in Angra dos Reis, Brazil, is located in a region with high rainfall and rugged terrain. This article presents digital image processing and geoprocessing procedures for mapping landslide-susceptible areas and landslide scars associated with the CNAAA access routes. Digital Elevation Models and their derivations were used to identify landslide-susceptible areas, and LANDSAT images were used to map the land cover. The information was superimposed, and the hazard areas and potential landslide scars were mapped. Most of the study area is medium or high risk for landslide events. Landslides scars mapping achieved over 50% of accuracy representing a potential methodology for the risk assessment and landslides monitoring in the study area. The results demonstrate that further and detailed studies must be performed in the areas in order to maintain the access roads available for eventual evacuations in a technological disaster event.Resumo: Acidentes tecnológicos podem ter vasta abrangência e necessitam rápida resposta para evacuação da região afetada. As vias de acesso para centrais nucleares são fundamentais para elaboração de planos emergenciais em caso de desastres tecnológicos. Na Central Nuclear Almirante Álvaro Alberto (CNAAA) em Angra dos Reis (RJ), as vias de acesso e sua própria estrutura localizam-se em região com altos índices de precipitação e relevo bastante acidentado. Este artigo visa apresentar procedimentos de processamento digital de imagens e geoprocessamento para o mapeamento de áreas de risco e de cicatrizes de deslizamento associadas às vias de acesso do CNAAA. Modelos Digitais de Elevação e suas derivações foram utilizados para a identificação de áreas de risco, por meio de classificação baseada em objeto. Imagens LANDSAT foram utilizadas para o mapeamento da cobertura do solo. As informações foram sobrepostas e as áreas de risco e as potenciais cicatrizes de deslizamento foram mapeadas. Os resultados apresentam um diagnóstico sobre a susceptibilidade à escorregamentos na área de estudo e das potenciais áreas de risco. As informações apresentadas sobre as áreas associadas às principais vias de acesso evidenciam o risco de ocorrência de escorregamentos que pode afetar a evacuação da região em caso de acidente tecnológico.
       
  • SPATIAL DEPENDENCE INDEX FOR CUBIC, PENTASPHERICAL AND WAVE SEMIVARIOGRAM
           MODELS

    • Abstract: : This study aims to propose a spatial dependence index (and its classification), from the concept of spatial correlation areas, for the Cubic, Pentaspherical and Wave models. The index, called Spatial Dependence Index (SDI), covers the following parameters: the range (a), the nugget effect (C 0 ) and the contribution (C 1 ), beyond considering the maximum distance (MD) between sampled points and the model factor (MF). The proposed index, unlike the most used in the literature, considers the influence of the range parameter to describe the spatial dependence, highlighting the importance of this formulation. The spatial dependence classification, based on the observed asymmetric behavior in the SDI, was performed considering categorizations from the median and the 3rd quartile of the index. We obtain the spatial dependence classification in terms of weak, moderate, and strong, just as it is usually described in literature.Resumo: Este estudo tem como objetivo propor um índice de dependência espacial (e sua classificação), a partir do conceito de áreas de correlação espacial, para os modelos Cúbico, Pentaesférico e Wave. O índice, denominado Índice de Dependência Espacial (IDE), abrange os seguintes parâmetros: o alcance (a), o efeito pepita (C 0 ) e contribuição (C 1 ), além de considerar a distância máxima entre pontos amostrados (MD) e o fator modelo (FM). O índice proposto, ao contrário do mais utilizado na literatura, considera a influência do parâmetro alcance para descrever a dependência espacial, destacando a importância desta formulação. A classificação de dependência espacial, construída com base no comportamento assimétrico observado no IDE, foi realizada considerando categorizações da mediana e do 3º quartil do índice. Obtemos a classificação de dependência espacial em termos de fraca, moderada e forte, tal como é normalmente descrito na literatura.
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 54.162.121.80
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-