Exploració per tema "Ciències de la terra"

Ara es mostren els items 1-20 de 30

    • 3Cat-2: A P(Y) and C/A GNSS-R experimental nano-satellite mission 

      Carreño Luengo, Hugo; Camps Carmona, Adriano José; Perez Ramos, I.; Forte, G.; Onrubia Ibáñez, Raúl; Díez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      3Cat-2 is a 6 U CubeSat mission designed to perform ocean altimetry by means of Global Navigation Satellite Systems Reflectometry (GNSS-R). In this paper 3Cat-2 mission is presented. The main payload is the novel dual-band ...

    • A physical analysis of polarimetric SAR data statistical models 

      Deng, Xinping; López Martínez, Carlos; Varona, Eduardo Makhoul (Institute of Electrical and Electronics Engineers (IEEE), 2016-01-08)
      Article
      Accés obert
      The random walk model is studied with the objective to obtain a physical explanation for the texture of polarimetric synthetic aperture radar (SAR) data. A simulator is designed to imitate the scattering process under ...

    • Adaptive estimation of the stable boundary layer height using combined lidar and microwave radiometer observations 

      Saeed, Umar; Rocadenbosch Burillo, Francisco; Crewell, Susanne (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Article
      Accés obert
      A synergetic approach for the estimation of stable boundary-layer height (SBLH) using lidar and microwave radiometer (MWR) data is presented. Vertical variance of the backscatter signal from a ceilometer is ...

    • Altimetry performance and error budget of the PARIS in-orbit demonstration mission 

      Camps Carmona, Adriano José; Pascual Biosca, Daniel; Hyuk, Park; Martín Alemany, Francisco; Rius, Antonio; Ribó Vedrilla, Serni; Benito, Javier; Andrés, A.; Saameno, Paula; Staton, Gavin; Martín Neira, Manuel; D'Addio, Salvatore; Willemsen, P. (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Reflectometry using Global Navigation Satellite System's signals of opportunity (GNSS-R) was originally conceived for mesoscale altimetry [1], although its applicability to sea state determination, soil moisture, vegetation, ...

    • An efficient method for the azimuth compression of geosynchronous SAR data through sub-apertures processing 

      Belotti, Michele; Broquetas Ibars, Antoni; Leanza, Antonio; Monti Guarnieri, Andrea; Recchia, Andrea; Rocca, Fabio; Ruiz Rodon, Josep; Tebaldini, Stefano (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We propose an efficient method for the azimuth compression and Atmospheric Phase Screen estimation of Geosynchronous SAR data. The method is based on the iterative processing of sub-apertures of increasing size, allowing ...

    • Analysis of correlation and total power radiometer front-ends using noise waves 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Camps Carmona, Adriano José; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Rautiainen, Kimmo; Martín Neira, Manuel; Colliander, Andreas (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-11-30)
      Article
      Accés obert
      A complete and systematic noise analysis of radiometer front-ends, including both total power and correlation measurements, is presented. The procedure uses the concepts of noise waves and S-parameters, widely used in ...

    • Denormalization of visibilities for in-orbit calibration of interferometric radiometers 

      Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Beraza Robledano, Santiago; Gutiérrez, C.; Martín Neira, Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-10-31)
      Article
      Accés obert
      This paper reviews the relative calibration of an interferometric radiometer taking into account the experimental results of the first batch of receivers developed in the frame of the European Space Agency's Soil Moisture ...

    • Dust aerosol radiative effects during summer 2012 simulated with a coupled regional aerosol–atmosphere–ocean model over the Mediterranean 

      Nabat, Pierre; Somot, S; Mallet, Marc; Michou, M; Sevault, F; Driouech, F; Meloni, D; di Sarra, G; di Biagio, C; Formenti, P; Sicard, Michaël; Leon, JF; Bouin, MN (2014-10-02)
      Article
      Accés obert
      The present study investigates the effects of aerosols on the Mediterranean climate daily variability during summer 2012. Simulations have been carried out using the coupled regional climate system model CNRM-RCSM5 which ...

    • EARLINET instrument intercomparison campaigns: overview on strategy and results 

      Wandinger, Ulla; Freudenthaler, Volker; Baars, Holger; Amodeo, Aldo; Engelmann, Ronny; Mattis, Ina; Gross, Silke; Pappalardo, Gelsomina; Giunta, Aldo; D'Amico, Giuseppe; Chaikovsky, Anatoli; Osipenko, Fiodor; Slesar, Alexander; Nicolae, D.; Belegante, Livio; Talianu, Camelia; Serikov, I.; Linné, Holger; Jansen, Friedhelm; Apituley, Arnoud; Wilson, K.; de Graaf, Martin; Trickl, Thomas; Giehl, H.; Adam, Mariana; Comerón Tejero, Adolfo; Muñoz Porcar, Constantino; Rocadenbosch Burillo, Francisco; Sicard, Michaël; Tomás Martinez, Sergio; Lange, Diego; Kumar, Dhiraj; Pujadas Cordero, Manuel; Molero, Francisco; Fernández, Alfonso J.; Alados Arboledas, Lucas; Bravo Aranda, J. A.; Navas Guzmán, Francisco; Guerrero Rascado, Juan Luis; Granados Muñoz, María José; Preissler, J.; Wagner, F.; Gausa, Michael; Grigorov, I. Ivan; Stoyanov, Dimitar Vassilev; Iarlori, M.; Rizi, Vicenzo; Spinelli, N.; Boselli, Antonella; Wang, Xuan; Lo Feudo, Teresa; Perrone, Maria-Rita; De Tomasi, Ferdinando; Burlizzi, Pasquale (2016-03-10)
      Article
      Accés obert
      This paper introduces the recent European Aerosol Research Lidar Network (EARLINET) quality-assurance efforts at instrument level. Within two dedicated campaigns and five single-site intercomparison activities, 21 EARLINET ...

    • EARLINET: towards an advanced sustainable European aerosol lidar network 

      Pappalardo, Gelsomina; Amodeo, Aldo; Apituley, Arnoud; Comerón Tejero, Adolfo; Freudenthaler, Volker; Linné, Holger; Ansmann, Albert; Bösenberg, Jens; D'Amico, Giuseppe; Mattis, Ina; Mona, Lucia; Wandinger, Ulla; Amiridis, Vassilis; Alados Arboledas, Lucas; Nicolae, D.; Wiegner, M. (2014-08-08)
      Article
      Accés obert
      The European Aerosol Research Lidar Network, EARLINET, was founded in 2000 as a research project for establishing a quantitative, comprehensive, and statistically significant database for the horizontal, vertical, and ...

    • Evaluating the impact of task aggregation in workflows with shared resources environments 

      Giménez de Castro Marciani, Manuel (Universitat Politècnica de Catalunya, 2023-10-20)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Barcelona Supercomputing Center
      We study the relative impact of task aggregation, or wrapping, which is a technique meant for computational workflows that bundles jobs into a single submission to be sent to remote schedulers. Experiments inside the Earth ...

    • Higher order statistics for texture analysis and physical interpretation of polarimetric SAR data 

      Deng, Xinping; López Martínez, Carlos (2016-07-01)
      Article
      Accés obert
      The logarithmic cumulants (log-cumulants for short) of the second and third orders are widely used in the statistical analysis of polarimetric synthetic aperture radar (PolSAR) data. However, both the product model and the ...

    • Impact of scene decorrelation on geosynchronous SAR data focusing 

      Recchia, Andrea; Monti Guarnieri, Andrea; Broquetas Ibars, Antoni; Leanza, Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2016-03-01)
      Article
      Accés obert
      We discuss the effects of the clutter on geosynchronous SAR systems exploiting long integration times (from minutes to hours) to counteract for two-way propagation losses and increase azimuth resolution. Only stable targets ...

    • Multi-scale enhancement of climate prediction over land by increasing the model sensitivity to vegetation variability in EC-Earth 

      Alessandri, Andrea; Catalano, Franco; de Felice, Matteo; van der Hurk, Bart; Doblas-Reyes, Francisco; Boussetta, Souhail; Balsamo, Gianpaolo; Miller, Paul A. (Springer, 2017-08)
      Article
      Accés obert
      The EC-Earth earth system model has been recently developed to include the dynamics of vegetation. In its original formulation, vegetation variability is simply operated by the Leaf Area Index (LAI), which affects climate ...

    • Nodal sampling: a new image reconstruction algorithm for SMOS 

      Gonzalez Gambau, Verónica; Turiel, Antonio; Olmedo Casal, Estrella; Martinez, Justino; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016-04-01)
      Article
      Accés obert
      Soil moisture and ocean salinity (SMOS) brightness temperature (TB) images and calibrated visibilities are related by the so-called G -matrix. Due to the incomplete sampling at some spatial frequencies, sharp transitions ...

    • Object recognition in urban hyperspectral images using binary partition tree representation 

      Valero, Silvia; Salembier Clairon, Philippe Jean; Chanussot, Jocelyn (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, an image representation based on Binary Partition Tree is proposed for object detection in hyperspectral images. The BPT representation defines a search space for constructing a robust object identification ...

    • On-board phase and modulus calibration of large aperture synthesis radiometers: study applied to miras. 

      Torres Torres, Francisco; Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Ferrero Pintor, Roberto (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996-07-01)
      Article
      Accés obert
      On-board calibration of bidimensional aperture synthesis radiometers with a large number of antennas by the standard correlated noise injection method is technologically very critical because of the stringent requirements ...

    • Optimització de la cadena de processat de l'aplicació d'Earth Sciences NMMB/BSC-CTM 

      Yepes Arbós, Xavier (Universitat Politècnica de Catalunya, 2015-01-28)
      Treball Final de Grau
      Accés obert
      [CATALÀ] Aquest document explica les anàlisis i optimitzacions que s'han dut a terme per tal de millorar el temps d'execució de l'etapa de postprocés de l'aplicació NMMB/BSC-CTM. Els resultats obtinguts són favorables, ja ...

    • Optimization of atmospheric transport models on HPC platforms 

      De la Cruz Martinez, Raul; Folch, Arnau; Farré, Pau; Cabezas, Javier; Navarro, Nacho; Cela Espín, José M. (2016-12)
      Article
      Accés obert
      The performance and scalability of atmospheric transport models on high performance computing environments is often far from optimal for multiple reasons including, for example, sequential input and output, synchronous ...

    • Optimizing domain decomposition in an ocean model: the case of NEMO 

      Tintó, Oriol; Acosta, Mario; Castrillo, Miguel; Cortés, Ana; Sanchez, Alicia; Serradell, Kim; Doblas-Reyes, Francisco (Elsevier, 2017)
      Article
      Accés obert
      Earth System Models are critical tools for the study of our climate and its future trends. These models are in constant evolution and their growing complexity entails an incrementing demand of the resources they require. ...