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Análise das mudanças de uso e cobertura da terra no sudeste de Roraima ? Brasil. Repositório Alice
XAUD, M. R.; EPIPHANIO, J. C. N.; XAUD, H. A. M..
2011
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Remote sensing.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/989273
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Rotação radiométrica para detecção de mudanças na paisagem de tensão ecológica em Roraima. Repositório Alice
PAVANELLI, J. A. P.; MALDONADO, F. D.; SANTOS, J. R. dos; GALVÃO, L. S.; XAUD, M. R.; XAUD, H. A. M..
2015
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Remote sensing.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1029105
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Institutional design and landscape fragmentation: a comparative study of rural colonization projects in the Brazilian Amazon. Repositório Alice
BATISTELLA, M.; CASTRO, F..
2001
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Remote sensing.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/31467
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Remote Sensing Needs and Capabilities In West Africa OceanDocs
Koranteng, K.A.; Opoku-Duah, S..
The greatest advantage of remote sensing over conventional measurements lies in the opportunity to carry out detailed spatio-temporal analysis of land and ocean features on a very frequent basis. This paper analyses the contribution of satellite imagery to atmospheric, geophysical and ocean studies and management in West Africa since the early 1980s. The detailed application of data from optical sensors (e.g. Meteosat, NOAA/AVHRR, SPOT, Landsat TM, etc.) for weather prediction, hydrogeological, landuse/cover and cartographic studies has been acknowledged. However, the use of microwave (e.g. SAR) and optical data for ocean monitoring and studies in the sub-region is still very limited. Even...
Tipo: Conference Material Palavras-chave: Remote sensing.
Ano: 2002 URL: http://hdl.handle.net/1834/654
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Multitemporal spectral mixture analysis for Amazonian land-cover change detection. Repositório Alice
LU, D.; BATISTELLA, M.; MORAN, E..
The complex landscape and environmental conditions in the moist tropical region often result in poor land-cover change detection accuracy using traditional change detection methods. This paper explores linear spectral mixture analysis (LSMA) of multitemporal thematic mapper (TM) images to detect land-cover change in Rondônia, Brazilian Amazon basin. Three image endmembers (shade, green vegetation, and soil) were developed based on a combination of field data and image scatterplots. An unconstrained least-squares solution was used to unmix the multitemporal TM images into three fractions. Then, fraction image differencing results were used to analyze land-cover change/non-change detection. The detailed ?from-to? change detection was implemented using a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Tropical region; Remote sensing.
Ano: 2004 URL: http://www.alice.cnptia.embrapa.br/handle/doc/994980
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Processamento de imagem SAR (Banda L) para detecção histórica de áreas florestais degradadas por incêndios recorrentes em Roraima. Repositório Alice
XAUD, H. A. M.; SANTOS, J. R. dos; MARTINS, F. da S. R. V.; XAUD, M. R..
bitstream/item/171227/1/galoa-proceedings-sbsr-59365-processamento-de1.pdf
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Remote sensing; Forest fire.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1085628
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Comparative assessment of atmospheric correction of Landsat imagery using Modtran and dark object subtraction. Repositório Alice
LOEBMANN, D. G. dos S. W.; VICENTE, L. E.; DE PAULA, S. C.; VICTORIA, D. de C.; ANDRADE, R. G.; SILVA, R. F. B. DA; AGNESE, M. L..
Remote sensing by spectral imaging of the Earth's surface can be widely used, but only when the atmospheric influence is nullified and the data are reduced to surface reflectance units. The atmospheric correction referred to here is an atmospheric "compensation" or "characterization" in which algorithms are used in remote sensing applications for hyper and multispectral images to correct atmospheric propagation effects in measurements taken by airborne and orbital systems. The remission of atmospheric effects guarantees the identification of biophysical properties of the targets and their isonomic relationship with...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Remote sensing; Spectral imaging.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/952219
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Fusion of High Spatial Resolution with Extended Spectral Resolution Bands of CBERS Satellite Sensors for Land Use Survey Ciências Agrárias
Batista, Getulio Teixeira; Catelani, Celso de Souza.
Trabalho aceito para apresentação no 2nd. International Conference on Computing, Communication and Control Technologies: CCCT'04
Tipo: Article Palavras-chave: Image Analysis; Remote Sensing.
Ano: 2004 URL: http://hdl.handle.net/2315/147
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Earth-viewing L-band radiometer sensing of sea surface scattered celestial sky radiation - Part I: General characteristics ArchiMer
Tenerelli, Joseph; Reul, Nicolas; Mouche, Alexis; Chapron, Bertrand.
The "galactic glitter" phenomenon at L-band, i.e., the scattering of celestial sky radiation by the rough ocean surface, is examined here as a potential source of error for sea surface salinity (SSS) remote sensing. We begin by considering the transformations that must be applied to downwelling celestial noise in order to compute the eventual impact on the antenna temperature. Then, outside the context of any particular measurement system, we use approximate scattering models along with a model for the equilibrium wind wave spectrum to examine how the scattered signal at the surface might depend on the geophysical conditions and scattering geometry. It is found that, when the specular...
Tipo: Text Palavras-chave: Scattering; Remote sensing; Radiometry.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3922.pdf
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GNSS-R nonlocal sea state dependencies: Model and empirical verification ArchiMer
Chen-zhang, David D.; Ruf, Christopher S.; Ardhuin, Fabrice; Park, Jeonghwan.
Global Navigation Satellite System Reflectometry (GNSS-R) is an active, bistatic remote sensing technique operating at L-band frequencies. GNSS-R signals scattered from a rough ocean surface are known to interact with longer surface waves than traditional scatterometery and altimetry signals. A revised forward model for GNSS-R measurements is presented which assumes an ocean surface wave spectrum that is forced by other sources than just the local near-surface winds. The model is motivated by recent spaceborne GNSS-R observations that indicate a strong scattering dependence on significant wave height, even after controlling for local wind speed. This behavior is not well represented by the...
Tipo: Text Palavras-chave: Waves; Wind; Remote sensing.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00358/46909/46809.pdf
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Study on Remote Sensing of Water Depths Based on BP Artificial Neural Network. OceanDocs
Wang, Yanjiao; Zhang, Peiqun; Dong, Wenjie; Zhang, Ying.
A momentum BP neural network model (MBPNNM) was constructed to retrieve the water depth information for the South Channel of the Yangtze River Estuary using the relationship between the reflectance derived from Landsat 7 satellite data and the water depth information.Results showed that MBPNNM, which exhibited a strong capability of nonlinear mapping, allowed the water depth information in the study area to be retrieved at a relatively high level of accuracy.Affected by the sediment concentration of water in the estuary, MBPNNM enabled the retrieval of water depth of less than 5 meters accurately. However, the accuracy was not ideal for the water depths of more than 10 meters.
Tipo: Journal Contribution Palavras-chave: Remote sensing; Data retrieval.
Ano: 2007 URL: http://hdl.handle.net/1834/5850
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First IOC Training Course on the Applications of Satellite Remote Sensing to Marine Studies, Caracas, Venezuela, 24-28 September 1990. OceanDocs
Supported by IOC for UNESCO.
Tipo: Report Palavras-chave: Remote sensing; Marine sciences.
Ano: 1990 URL: http://hdl.handle.net/1834/5593
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Irrigation performance assessments for corn crop with LANDSAT images in the São Paulo State, Brazil. Repositório Alice
TEIXEIRA, A. H. de C.; HERNANDEZ, F. B. T.; ANDRADE, R. G.; LEIVAS, J. F.; BOLFE, E. L..
A evapotranspiração (ET) e coeficiente de cultura (Kc) foram modelados em uma fazenda comercial com a cultura do milho irrigada por pivôs centrais para grãos e silagem, no lado noroeste do Estado de São Paulo, Brasil. Para obtenção da ET, o algoritmo SAFER (Simple Algorithm For Evapotranspiration Retrieving) foi aplicado em imagens do satélite Landsat durante os ciclos produtivos (CP) de março a agosto de 2010. Funções polinomiais relacionando o coeficiente de cultura (Kc) com os graus-dias acumulados (GDac) permitiram a estimativa da evapotranspiração em condições potenciais (ETp). Adicionando dados de evapotranspiração de referência (ET0), precipitação (P), irrigação (I) e produtividade (Yp), os desempenhos de irrigação foram analisados. A...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Remote sensing; Evapotranspiration; Crop coefficient.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/986240
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Topographic shadow influence on optical image acquired by satellite in the southern hemisphere. Repositório Alice
FRANÇA, M. M.; FERNANDES FILHO, E. I.; FERREIRA, W. P. M.; LAN, J. L.; SOARES, V. P..
During image acquisition, is usually chosen scenes with a lesser cloud cover to avoid loss of spectral information. However, when training samples are collected for image classification, the user finds shadowed areas. Such situation is similar to the presence of clouds since spectral information of these classes is the same in all optical bands of the sensor. This fact becomes more pronounced in mountainous relief areas due to shadow projection on the terrain, which can vary among all seasons during the solar year. With the goal to obtain images with a lower presence of shadow, it was simulated, under the same relief conditions, shading variation in function of latitude (0º to 40º S). Solar radiation models were processed for the days and times passages of...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Landsat; Remote sensing; Solar radiation.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1108684
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Interpretation of multi-season, multiyear color imagery for a continental-shelf region ArchiMer
Topliss, Bj; Payzant, La; Hurley, Pcf; Miller, Jr; Freemantle, J.
A comparison was made between multi-year, multi-season cruise information from the surface waters of the Scotian shelf and satellite imagery from the Coastal Zone Colour Scanner (CZCS). The colour imagery was able to identify several physical processes on the shelf (such as outflows and upwelling) to approximately the same degree as previously reported with thermal imagery. Because processing CZCS data requires the use of atmospheric and marine models defined by a range of input parameters, the various processing steps and assumptions were evaluated for potential impact on any marine interpretation of the imagery. The shelf waters were not a pure oceanic water mass throughout the year and turbidity levels were found to be the most significant interfering...
Tipo: Text Palavras-chave: SHELF SEA; REMOTE SENSING; TURBIDITY.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00103/21381/18981.pdf
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Evaluation of the surface energy balance system (SEBS) applied to ASTER imagery with flux-measurements at the SPARC 2004 site (Barrax, Spain) Inra
van der Kwast, J.; TIMMERMANS, A.; Gieske, A.; SU, Z.; Olioso, A.; Jia, L.; Elbers, J.; Karssenberg, D.; de Jong, S..
Accurate quantification of the amount and spatial variation of evapotranspiration is important in a wide range of disciplines. Remote sensing based surface energy balance models have been developed to estimate turbulent surface energy fluxes at different scales. The objective of this study is to evaluate the Surface Energy Balance System (SEBS) model on a landscape scale, using tower-based flux measurements at different land cover units during an overpass of the ASTER sensor over the SPARC 2004 experimental site in Barrax (Spain). Additionally, the effect of replacement of empirical roughness functions in the model by field estimates or literature values is investigated. Modelled fluxes...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; ENERGY BALANCE; MODELLING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200914bcdc5e&uri=/notices/prodinra1/2011/02/
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Thermal remote sensing from Airborne Hyperspectral Scanner data in the framework of the SPARC and SEN2FLEX projects: an overview Inra
Sobrino, J.A.; Jiménez-Muñoz, J.C.; Zarco-Tejada, P.J.; Sepulcre-Cantó, G.; de Miguel, E.; Soria, E.; Romaguera, M.; Julien, Y.; Cuenca, J.; Hidalgo, V.; Franch, B.; Mattar, C.; Morales, L.; Gillespie, A.; Sabol, D.; Balick, L.; Su, Z.; Jia, L.; Gieske, A.; Timmermans, W.; Olioso, A.; Nerry, F.; Guanter, L.; Moreno, J.; Shen, Q..
The AHS (Airborne Hyperspectral Scanner) instrument has 80 spectral bands covering the visible and near infrared (VNIR), short wave infrared (SWIR), mid infrared (MIR) and thermal infrared (TIR) spectral range. The instrument is operated by Instituto Nacional de Técnica Aerospacial (INTA), and it has been involved in several field campaigns since 2004.This paper presents an overview of the work performed with the AHS thermal imagery provided in the framework of the SPARC and SEN2FLEX campaigns, carried out respectively in 2004 and 2005 over an agricultural area in Spain. The data collected in both campaigns allowed for the first time the development and testing of algorithms for land surface temperature and emissivity retrieval as well as the estimation of...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; SURFACE TEMPERATURE; INFRARED.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011facebc7d&uri=/notices/prodinra1/2011/02/
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An Assessment of Urban Heat Island Effect using Remote Sensing Data. OceanDocs
Wang, Guiling; Jiang, Weimei; Wei, Ming.
Characteristics of urban heat island (UHI) effect and its cause are investigated by using MODIS data in April 2004. Surface parameters from the MODIS data have surface temperature (ts), albedo(a), and normalized difference vegetation index (NDVI). Their heterogeneities over urban and rural area are analyzed based on land cover classification, and their relations are also presented in order to explain the UHI effect. The results show that there exists obvious the UHI effect. Ts over urban areas are by 10.83 % higher than those over rural area,and NDVI and a over urban area are by 62 % and 18.75 % less than those over rural area, respectively. Surface temperature has significantly negative correlation with NDVI and their correlation coefficient is -0.73....
Tipo: Journal Contribution Palavras-chave: Remote sensing; Albedo; Surface temperature.
Ano: 2008 URL: http://hdl.handle.net/1834/5876
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Spatiotemporal variability of evapotranspiration in Pantanal, Brazil, using satellite images. Repositório Alice
LEIVAS, J. F.; TEIXEIRA, A. H. de C.; ANDRADE, R. G.; VICTORIA, D. de C.; TORRESAN, F. E..
Apesar da importância da evapotranspiração (ET) para o Pantanal, existem poucos estudos sobre o tema. Este estudo tem o objetivo de estimar a evapotranspiração no Pantanal aplicando o modelo agrometeorológico-espectral SAFER (Simple Algorithm For Evapotranspiration Retrieving) e utilizando imagens de satélite e dados de estações meteorológicas para analisar a variabilidade espaçotemporal dessa variável no bioma.Foram utilizadas 46 imagens do satélite MODIS (Moderate Resolution Imaging Spectroradiometer), com resolução espacial de 250 m e temporal de 16 dias, referentes aos períodos chuvoso (outubro de 2011 a março de 2012) e seco (abril a setembro de 2012). Os dados meteorológicos foram agrupados em 16 dias para coincidir com a resolução temporal das...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: MODIS; Patanal; Remote sensing; Evapotranspiration; Solar radiation.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1028819
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Agricultura de precisão para a sustentabilidade de sistemas produtivos do agronegócio brasileiro. Repositório Alice
INAMASU, R. Y.; BERNARDI, A. C. de C.; VAZ, C. M. P.; NAIME, J. de M.; QUEIROS, L. R.; RESENDE, A. V. de; VILELA, M. de F.; JORGE, L. A. de C.; BASSOI, L. H.; PEREZ, N. B.; FRAGALLE, E. P..
2011
Tipo: Capítulo em livro técnico-científico (ALICE) Palavras-chave: Sensoriamento remoto; Precision agriculture; Remote sensing.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/907451
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