Ara es mostren els items 39-58 de 131

    • Edge enhancement algorithm based on the wavelet transform for automatic edge detection in SAR images 

      Tello Alonso, Mª Victoria; López Martínez, Carlos; Mallorquí Franquet, Jordi Joan; Salembier Clairon, Philippe Jean (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-01-01)
      Article
      Accés obert
      This paper presents a novel technique for automatic edge enhancement and detection in synthetic aperture radar (SAR) images. The characteristics of SAR images justify the importance of an edge enhancement step prior to ...
    • Estimation of gravimetric vegetation moisture in the western United States using a multi-sensor approach 

      Chaparro Danon, David; Jagdhuber, Thomas; Piles Guillem, María; Jonard, François; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; López Martínez, Carlos; Fluhrer, Anke; Fernández Morán, Roberto; Baur, Martin J.; Feldman, Andrew F.; Entekhabi, Dara (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      Vegetation optical depth (VOD) depends on the water, structure, and biomass of vegetation. Here, we propose a multi-sensor approach to isolate the water component from the VOD and to retrieve gravimetric vegetation moisture ...
    • Estimation of snow pack characteristics by means of polarimetric SAR data 

      Reppucci, Antonio; Banque, Xavier; López Martínez, Carlos; Zhan, Yu; Alonso González, Alberto (SPIE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Characterization of the snow-pack is fundamental for several applications in hydrology, such as modelling and forecasting of snow melt runoff, water resource management and risk analysis. Thanks to its night/day capabilities ...
    • Estimation of vegetation structure parameters from SMAP radar intensity observations 

      Jagdhuber, Thomas; Montzka, Carsten; López Martínez, Carlos; Baur, Martin J.; Link, Moritz; Piles de la Fuente, María Pilar; Das, Narendra Narayan; Jonard, François (Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
      Article
      Accés obert
      In this article, we present a multipolarimetric estimation approach for two model-based vegetation structure parameters (shape A and orientation distribution ψ of the main canopy elements). The approach is based on a reduced ...
    • Evaluation of a bilateral filtering approach for tomographic SAR denoising 

      D'Hondt, Olivier; Guillaso, Stephane; López Martínez, Carlos; Hellwich, Ollaf (VDE-Verlag, 2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This work proposes to evaluate the effects of a spatially adaptive filter called NDSAR-BLF (N-Dimensional SAR Bilateral Filter) on scatterer separation and height estimation from SAR tomograms. We have developed a spatial ...
    • Examen Final 

      Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi; Fabregas Canovas, Francisco Javier; López Martínez, Carlos; Vall-Llossera Ferran, Mercedes Magdalena (Universitat Politècnica de Catalunya, 2021-01-23)
      Examen
      Accés restringit a la comunitat UPC
    • Examen Final 

      Corbella Sanahuja, Ignasi; López Martínez, Carlos; Mallorquí Franquet, Jordi Joan; Vall-Llossera Ferran, Mercedes Magdalena (Universitat Politècnica de Catalunya, 2020-06-09)
      Examen
      Accés restringit a la comunitat UPC
    • Examen Final 

      Corbella Sanahuja, Ignasi; López Martínez, Carlos; Vall-Llossera Ferran, Mercedes Magdalena (Universitat Politècnica de Catalunya, 2021-06-22)
      Examen
      Accés restringit a la comunitat UPC
    • Examen Final 

      Esquerra Llucià, Ignasi; López Martínez, Carlos; Muñoz Medina, Olga; Vilaplana Besler, Verónica; Villares Piera, Nemesio Javier (Universitat Politècnica de Catalunya, 2021-06-03)
      Examen
      Accés restringit a la comunitat UPC
    • Examen Final 

      Corbella Sanahuja, Ignasi; Vall-Llossera Ferran, Mercedes Magdalena; López Martínez, Carlos (Universitat Politècnica de Catalunya, 2022-05-31)
      Examen
      Accés restringit a la comunitat UPC
    • Examen Final 

      Corbella Sanahuja, Ignasi; Fabregas Canovas, Francisco Javier; López Martínez, Carlos; Vall-Llossera Ferran, Mercedes Magdalena (Universitat Politècnica de Catalunya, 2022-01-19)
      Examen
      Accés restringit a la comunitat UPC
    • Exploitation of the additive component of the polarimetric noise model for speckle filtering 

      Foucher, Samuel; Farage, Grégory; López Martínez, Carlos (2010)
      Text en actes de congrés
      Accés obert
      Ratio filters for speckle noise reduction in SAR imagery are recursive filters where the image structure is iteratively recovered from an initial oversmoothed image. We show that the MBPolSAR filter could be interepreted ...
    • Exploiting polarimetric TerraSAR-X data for sea clutter characterization 

      Makhoul Varona, Eduardo; López Martínez, Carlos; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 2016-01-01)
      Article
      Accés obert
      This paper presents a detailed characterization of sea/ocean clutter returns at X-band, imaged by TerraSAR-X (TSX) mission from the radiometric, statistical, and polarimetric standpoints. Different TSX data takes, covering ...
    • Filtering and segmentation of polarimetric SAR data based on binary partition trees 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE Press. Institute of Electrical and Electronics Engineers, 2012-02)
      Article
      Accés restringit per política de l'editorial
      In this paper,we propose the use of binary partition trees (BPT) to introduce a novel region-based and multi-scale polarimetric SAR (PolSAR) data representation. The BPT structure represents homogeneous regions in the ...
    • Filtering and segmentation of polarimetric SAR images with binary partition trees 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (2010)
      Text en actes de congrés
      Accés obert
      A new multi-scale PolSAR data filtering technique, based on a Binary Partition Tree (BPT) representation of the data, is proposed. Different alternatives for the construction and the exploitation of the BPT for filtering ...
    • Forest parameter estimation in the Pol-InSAR context employing the multiplicative–additive speckle noise model 

      López Martínez, Carlos; Fabregas Canovas, Francisco Javier; Pipia, Luca (2011-09)
      Article
      Accés restringit per política de l'editorial
      This paper addresses the problem of speckle noise on single baseline polarimetric SAR interferometry (Pol-InSAR) on the basis of the multiplicative–additive speckle noise model. Considering this speckle noise model, a novel ...
    • Fuzzy cognitive maps applied to synthetic aperture radar image classifications 

      Pajares Martinsanz, Gonzalo; Sánchez Lladó, Francisco Javier; López Martínez, Carlos (Springer Verlag, 2011-08-08)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper proposes a method based on Fuzzy Cognitive Maps (FCM) for improving the classification provided by the Wishart maximum-likelihood based approach in Synthetic Aperture Radar (SAR) images. FCM receives the ...
    • Global unsupervised assessment of multifrequency vegetation optical depth sensitivity to vegetation cover 

      Olivares Cabello, Claudia Lily; Chaparro Danon, David; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; López Martínez, Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Article
      Accés obert
      Vegetation optical depth (VOD) has contributed to monitor vegetation dynamics and carbon stocks at different microwave frequencies. Nevertheless, there is a need to determine which are the appropriate frequencies to monitor ...
    • Ground topography estimation on over forests considering polarimetric SAR interferometry 

      López Martínez, Carlos; Alonso González, Alberto; Fabregas Canovas, Francisco Javier; Papathanassiou, Kostantinos (2010)
      Text en actes de congrés
      Accés obert
      The work detailed in this paper analyzes the topographic phase retrieval process on forested areas by means of Polarimetric Interferometric SAR data. On the basis of the Random Volume over Ground scattering model, an ...
    • Ground topography retrieval on forested areas based on polarimetric SAR interferometry 

      López Martínez, Carlos; Fabregas Canovas, Francisco Javier; Alonso García, Alberto; Papathanassiou, Kostantinos (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The work shown in this paper analyzes the topographic phase retrieval process on forested areas by means of Polarimetric Interferometric SAR (PolInSAR) data. On the basis of the Random Volume over Ground scattering model, ...