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    • closedAccess   Two-level classifier ensembles for credit risk assessment 

      Marqués Marzal, Ana Isabel; García, Vicente; Sánchez Garreta, Josep Salvador Elsevier (2012)
      Many techniques have been proposed for credit risk assessment, from statistical models to artificial intelligence methods. During the last few years, different approaches to classifier ensembles have successfully been ...

    • openAccess   Open Source Based Deployment of Environmental Data into Geospatial Information Infrastructures 

      Gil, José; Díaz Sánchez, Laura; Granell, Carlos; Huerta, Joaquin IGI Global (2012)
      Today, scientists use local and closed geospatial solutions to run their models and store their results. This may limit their ability to share their models, and results with other interested colleagues. This scenario ...

    • openAccess   Single-pixel digital ghost holography 

      Clemente Pesudo, Pedro Javier; Tajahuerce, Enrique; Torres Company, Víctor; Lancis, Jesús; Durán, Vicente American Physical Society (2012)
      Since its discovery, the “ghost” diffraction phenomenon has emerged as an unconventional technique for optical imaging with very promising advantages. However, extracting the intensity and phase information of a structured ...

    • openAccess   Integración de modelos medioambientales en infraestructuras de datos espaciales: Un caso de uso en predicción de incendios 

      Trilles, Sergio; Juan, Pablo; Díaz Sánchez, Laura; Huerta, Joaquin Institut Cartogràfic de Catalunya (2012-02)
      Hoy en día los incendios forestales son unas de las principales amenazas medioambientales más crecientes a las que nos exponemos [2]. Esto produce la pérdida de bienes humanos y lo que es peor, la destrucción de la parte ...

    • openAccess   Real-time tessellation of terrain on graphics hardware 

      Puig Centelles, Anna; Ripollés Mateu, Oscar Enrique; Ramos, Jose Francisco; Chover, Miguel Elsevier (2012-04)
      Synthetic terrain is a key element in many applications, which can lessen the sense of realism if it is not handled correctly. We propose a new technique for visualizing terrain surfaces by tessellating them on the GPU. ...

    • openAccess   Participative site-specific agriculture analysis for smallholders 

      Huerta, Joaquin; Aragó Galindo, Pau; Granell, Carlos; Molin, Paulo Guilherme Springer (2012-04-27)
      Site-specific agriculture has been adopted in a high-tech context using, for instance, in situ sensors, satellite images for remote sensing analysis, and some other technological devices. However, farmers and smallholders ...

    • openAccess   New classes of spectral densities for lattice processes and random fields built from simple univariate margins 

      Porcu, Emilio; Mateu, Jorge; Gregori, Pablo; Ostoja-Starzewski, Martin Springer-Verlag (2012-05)
      Quasi arithmetic and Archimedean functionals are used to build new classes of spectral densities for processes defined on any d-dimensional lattice Zd and random fields defined on the d-dimensional Euclidean space Rd , ...

    • openAccess   Frequency resolved wavefront retrieval and dynamics of diffractive focused ultrashort pulses 

      Alonso, Benjamín; Borrego Varillas, Rocío; Mendoza-Yero, Omel; Sola, Íñigo Juan; San Román, Julio; Mínguez-Vega, Gladys; Roso, Luis Optical Society of America (2012-08)
      In this work we demonstrate the ability of the spatiotemporal characterization technique STARFISH to retrieve the wavelength dependent wavefront of focused ultrashort laser pulses. The high resolution achievable with this ...

    • closedAccess   Understanding the nesting spatial behaviour of gorillas in the Kagwene Sanctuary, Cameroon 

      Funwi-Gabga, N.; Mateu, Jorge Springer-Verlag (2012-08)
      We use spatial point pattern methods to analyse gorilla nest site data, and to enhance our understanding of the nesting behaviour of the Gorilla gorilla diehli in the Kagwene Sanctuary, Cameroon. Data were split into ...

    • openAccess   Using SWE Standards for Ubiquitous Environmental Sensing: A Performance Analysis 

      Tamayo Fong, Alain; Granell, Carlos; Huerta, Joaquin MDPI AG (2012-08-31)
      Although smartphone applications represent the most typical data consumer tool from the citizen perspective in environmental applications, they can also be used for in-situ data collection and production in varied scenarios, ...

    • closedAccess   Spatial recurrences for pedestrian classification 

      Serra Toro, Carlos; Montoliu Colás, Raul; Traver Roig, Vicente Javier Springer U.S. (2012-09)
      In this work, a framework is proposed for pedestrian classification based on spatial recurrences in the form of recurrence plots. This representation is more general and potentially more discriminative than a histogram of ...

    • openAccess   Hierarchical clustering of spatially correlated functional data 

      Giraldo, Ramón; Delicado, Pedro; Mateu, Jorge John Wiley & Sons (2012-11)
      Classification problems of functional data arise naturally in many applications. Several approaches have been considered for solving the problem of funding groups based on functional data. In this paper we are interested ...

    • openAccess   Web 2.0 Broker: A standards-based service for spatio-temporal search of crowd-sourced information 

      Díaz Sánchez, Laura; Granell, Carlos; Huerta, Joaquin; Gould, Michael Elsevier (2012-11)
      Recent trends in information technology show that citizens are increasingly willing to share information using tools provided by Web 2.0 and crowdsourcing platforms to describe events that may have social impact. This is ...

    • closedAccess   Pinpointing spatio-temporal interactions in wildfire patterns 

      Juan, Pablo; Mateu, Jorge; Sáez Zafra, Marc Springer-Verlag (2012-12)
      The spatial and spatio-temporal patterns of wildfire incidence and their relationship to various geographical and environmental variables are analyzed. Such relationships may be treated as components in particular point ...

    • openAccess   On-axis non-linear effects with programmable Dammann lenses under femtosecond illumination 

      Pérez Vizcaíno, Jorge; Mendoza-Yero, Omel; Borrego Varillas, Rocío; Mínguez-Vega, Gladys; Vázquez de Aldana, Javier R.; Lancis, Jesús Optical Society of America (2013)
      We demonstrate the utilization of Dammann lenses codified onto a spatial light modulator (SLM) for triggering non-linear effects. With continuous wave illumination Dammann lenses are binary phase optical elements that ...

    • closedAccess   Reply to Ollinger et al.: Remote sensing of leaf nitrogen and emergent ecosystem properties (Letter) 

      Latorre Carmona, Pedro; Knyazikhin, Yuri; Lewis, Philip; Disney, Mathias I.; Mõttus, Matti; Stenberg, Pauline; Rautiainen, Miina; Kaufmann, Robert K.; Marshak, Alexander; Schull, Mitchell A.; Vanderbilt, Vern; Davis, Anthony B.; Baret, Frédéric; Jacquemoud, Stéphane; Lyapustin, Alexei; Yang, Yan; Myneni, Ranga B. National Academy of Sciences (2013)
      Various physical, chemical, and physiological processes, including canopy structure, impact surface reflectance. Remote sensing aims to derive ecosystem properties and their functional relationships, given these impacts. ...

    • openAccess   Integration of Environmental Models in Spatial Data Infrastructures: A Use Case in Wildfire Risk Prediction 

      Trilles, Sergio; Juan, Pablo; Díaz, Laura; Aragó Galindo, Pau; Huerta, Joaquin Institute of Electrical and Electronics Engineers (IEEE) (2013)
      Achieving sustainable growth in our society implies monitoring our environment in order to measure human impact and detect relevant changes and detrimental driving factors such as wildfires and desertification. In order ...

    • openAccess   Effect of Denoising in Band Selection for Regression Tasks in Hyperspectral Datasets 

      Latorre Carmona, Pedro; Martínez Sotoca, José; Pla, Filiberto; Bioucas-Dias, José; Julià Ferré, Carme Institute of Electrical and Electronics Engineers (IEEE) (2013)
      This paper presents a comparative analysis of six band selection methods applied to hyperspectral datasets for biophysical variable estimation problems, where the effect of denoising on band selection performance has ...

    • openAccess   Femtosecond digital lensless holographic microscopy to image biological samples 

      Mendoza-Yero, Omel; Calabuig Barroso, Alejandro; Tajahuerce, Enrique; Lancis, Jesús; Andrés, Pedro; García Sucerquia, Jorge Optical Society of America (2013)
      The use of femtosecond laser radiation in digital lensless holographic microscopy (DLHM) to image biological samples is presented. A mode-locked Ti:Sa laser that emits ultrashort pulses of 12 fs intensity FWHM, with 800 ...

    • openAccess   Compressive holography with a single-pixel detector 

      Clemente Pesudo, Pedro Javier; Durán, Vicente; Tajahuerce, Enrique; Andrés, Pedro; Climent, Vicent; Lancis, Jesús Optical Society of America (2013)
      This Letter develops a framework for digital holography at optical wavelengths by merging phase-shifting interferometry with single-pixel optical imaging based on compressive sensing. The field diffracted by an input object ...