Ara es mostren els items 48-67 de 131

    • 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, ...
    • Ground-based polarimetric SAR interferometry for the monitoring of terrain displacement phenomena-part I: theoretical description 

      Iglesias González, Rubén; Aguasca Solé, Alberto; Fabregas Canovas, Francisco Javier; Mallorquí Franquet, Jordi Joan; Monells Miralles, Daniel; López Martínez, Carlos; Pipia, Luca (2015-03-01)
      Article
      Accés obert
      Ground-based synthetic aperture radar (SAR) (GB-SAR) sensors represent an effective solution for the monitoring of ground displacement episodes. Initially, the most GB-SAR sensors were based on vector network analyzers ...
    • Ground-based polarimetric SAR interferometry for the monitoring of terrain displacement phenomena-part II: applications 

      Iglesias González, Rubén; Aguasca Solé, Alberto; Fabregas Canovas, Francisco Javier; Mallorquí Franquet, Jordi Joan; Monells Miralles, Daniel; López Martínez, Carlos; Pipia, Luca (2015-03-01)
      Article
      Accés obert
      Urban subsidence and landslides are among the greatest hazards for people and infrastructure safety and they require an especial attention to reduce their associated risks. In this framework, ground-based synthetic aperture ...
    • 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 incidence angle diversity on SMOS and sentinel-1 soil moisture retrievals at coarse and fine scales 

      Portal González, Gerard; Vall-Llossera Ferran, Mercedes Magdalena; Piles Guillem, María; Jagdhuber, Thomas; Camps Carmona, Adriano José; Pablos Hernández, Miriam; López Martínez, Carlos; Das, Narendra; Entekhabi, Dara (Institute of Electrical and Electronics Engineers (IEEE), 2022-01-01)
      Article
      Accés obert
      Incidence angle diversity of space-borne radiometer and radar systems operating at low microwave frequencies needs to be taken into consideration to accurately estimate soil moisture (SM) across spatial scales. In this ...
    • Impact of wind-induced scatterers motion on GB-SAR imaging 

      Lort Cuenca, Marc; Aguasca Solé, Alberto; López Martínez, Carlos; Fabregas Canovas, Francisco Javier (Institute of Electrical and Electronics Engineers (IEEE), 2018-08-13)
      Article
      Accés obert
      Ground-based synthetic aperture radar (GB-SAR) sensors represent a cost-effective solution for change detection and ground displacement assessment of small-scale areas in real-time early warning applications. GB-SAR systems ...
    • Implementing the European Space Agency’s SentiNel application platform’s open-source Python module for differential synthetic aperture radar interferometry coseismic ground deformation from Sentinel-1 data 

      Occhipinti, Martina; Carboni, Filippo; Amorini, Shaila; Paltriccia, Nicola; López Martínez, Carlos; Porreca, Massimiliano (Multidisciplinary Digital Publishing Institute (MDPI), 2023-12-21)
      Article
      Accés obert
      Differential SAR Interferometry is a largely exploited technique to study ground deformations. A key application is the detection of the effects promoted by earthquakes, including detailed variations in ground deformations ...
    • Improving the wishart synthetic aperture radar image classifications through deterministic simulated annealing 

      Sánchez Lladó, Francisco Javier; Pajares Martinsanz, Gonzalo; López Martínez, Carlos (2011-11)
      Article
      Accés restringit per política de l'editorial
      This paper proposes the use of Deterministic Simulated Annealing (DSA) for Synthetic Aperture Radar (SAR) image classification for cluster refinement. We use the initial classification provided by the maximum- likelihood ...
    • Improving wishart classification of polarimetric SAR data using the hopfield neural network optimization approach 

      Pajares Martinsanz, Gonzalo; López Martínez, Carlos; Sánchez Lladó, Francisco Javier; Molina, Iñigo (2012-11-19)
      Article
      Accés restringit per política de l'editorial
      This paper proposes the optimization relaxation approach based on the analogue Hopfield Neural Network (HNN) for cluster refinement of pre-classified Polarimetric Synthetic Aperture Radar (PolSAR) image data. We consider ...
    • Influence of speckle filtering of polarimetric SAR data on different classification methods 

      Fang, Cao; Deladalle, Charles-Alban; Nicolas, Jean-Marie; Tupin, Florence; Denis, Loic; Ferro-Famil, Laurent; Pottier, Eric; López Martínez, Carlos (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper analyzes the effects of speckle filtering on polarimetric SAR decomposition and classification. We compared the results of the refined Lee, IDAN and Non-Local Polarimetric filters, and discussed their ALOS/PALSAR ...