Ara es mostren els items 21-40 de 131

    • Assessment and estimation of the RVoG model in polarimetric SAR interferometry 

      López Martínez, Carlos; Alonso González, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2014-06-01)
      Article
      Accés restringit per política de l'editorial
      This paper investigates the validity of the random-volume-over-ground (RVoG) scattering model assumption for forest scattering on polarimetric interferometric synthetic aperture radar (PolInSAR) data. The model makes some ...
    • Assessment of L-Band SAOCOM InSAR coherence and its comparison with C-Band: A case study over managed forests in Argentina 

      Ariel Seppi, Santiago; López Martínez, Carlos; Joseau, Marisa Jacqueline (Multidisciplinary Digital Publishing Institute (MDPI), 2022-11-09)
      Article
      Accés obert
      The objective of this work is to analyze the behavior of short temporal baseline interferomet ric coherence in forested areas for L-band spaceborne SAR data. Hence, an exploratory assessment of the impacts of temporal and ...
    • Assessment of L-Band SAR polarimetry for soil and crop monitoring 

      Barber, Matías; López Martínez, Carlos; Grings, Francisco (VDE-Verlag, 2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Near-future L-band fully polarimetric Synthetic Aperture Radar (SAR) missions will provide meaningful and timely information over agricultural lands. In this paper, we evaluate the potential of L-band SAR polarimetry for ...
    • Atmospheric phase screen compensation in ground-based sar with a multiple-regression model over mountainous regions 

      Iglesias González, Rubén; Fabregas Canovas, Francisco Javier; Aguasca Solé, Alberto; Mallorquí Franquet, Jordi Joan; López Martínez, Carlos; Gili Ripoll, José Antonio; Corominas Dulcet, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2014-05-01)
      Article
      Accés restringit per política de l'editorial
      In this paper, a new model-based technique for the compensation of severe height-dependent atmospheric artifacts, using ground-based synthetic aperture radar (SAR) data over mountainous regions, is proposed. The method ...
    • Automatic vessel monitoring with single and multidimensional SAR images in the wavelet domain 

      Tello Alonso, Mª Victoria; López Martínez, Carlos; Mallorquí Franquet, Jordi Joan (ELSEVIER SCIENCE BV, 2006-12-31)
      Article
      Accés obert
      Spaceborne Synthetic Aperture Radar (SAR) techniques constitute an extremely promising alternative compared to traditional surveillance methods thanks to the all-weather and day-and-night capabilities of Radar linked with ...
    • Basic principles of SAR polarimetry 

      López Martínez, Carlos; Pottier, Eric (Springer, 2021)
      Capítol de llibre
      Accés obert
      This chapter critically summarizes the main theoretical aspects necessary for a correct processing and interpretation of the polarimetric information towards the development of applications of synthetic aperture radar (SAR) ...
    • Bilateral distance based filtering for polarimetric SAR data 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean; Deng, Xinping (2013-10-30)
      Article
      Accés obert
      This paper introduces a non-linear Polarimetric SAR data filtering approach able to preserve the edges and small details of the data. It is based on exploiting the data locality in both, the spatial and the polarimetric ...
    • Binary partition tree as a polarimetric SAR data representation in the space-time domain 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE, 2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The aim of this paper is to present a Polarimetric Synthetic Aperture Radar data processing technique on the space-time domain. This approach is based on a Binary Partition Tree (BPT), which is a region-based and multi-scale ...
    • Built-up area mapping using Sentinel-1 SAR data 

      Verma, Abhinav; Bhattacharya, Avik; Dey, Subhadip; López Martínez, Carlos; Gamba, Paolo (Elsevier, 2023-09)
      Article
      Accés restringit per política de l'editorial
      A timely and accurate spatial mapping of built-up areas (BA) is crucial in making cities and human settlements safe, resilient, and sustainable. Synthetic Aperture Radar (SAR) data are useful for BA mapping due to strong ...
    • Burned area prediction in Southern Asia using machine learning with land and atmospheric parameters 

      Irawan, Amir Mustofa; Vall-Llossera Ferran, Mercedes Magdalena; López Martínez, Carlos; Camps Carmona, Adriano José; Chaparro Danon, David; Portal González, Gerard; Pablos Hernández, Miriam (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Comunicació de congrés
      Accés obert
      In the work a random forest model has been implemented as an interpretable machine learning tool in the effort to estimate the burned areas caused by fire outbreaks in India, Pakistan, and Myanmar in April and May 2022. ...
    • Cancellation of scattering mechanisms in PolInSAR: application to underlying topography estimation 

      López Martínez, Carlos; Papathanassiou, Kostantinos (IEEE Press. Institute of Electrical and Electronics Engineers, 2013-02)
      Article
      Accés restringit per política de l'editorial
      This paper investigates the polarimetric dependence of the interferometric complex correlation and proposes amethodology for cancelling individual scattering mechanisms, in terms of the complex correlation coefficient ...
    • Chapter 1.6: Early warning signals of Earth system tipping points 

      Boulton, Chris A.; Buxton, Joshua E.; Arellano Nava, Beatriz; Bathiany, Sebastian; Blaschke, Lana; Boers, Niklas; Dakos, Vasilis; Dylewsky, Daniel; Kéfi, Sonia; López Martínez, Carlos; Parry, Isobel; Ritchie, Paul; van der Bolt, Bregje; van der Laan, Larissa; Weinans, Els (University of Exeter, 2023)
      Capítol de llibre
      Accés obert
      This chapter focuses on the methods used to predict the movement of parts of the Earth system towards tipping points. It begins by introducing the theory of critical slowing down (CSD), a general phenomenon of slowing ...
    • Coastline detection based on Sentinel-1 time series for ship- and flood-monitoring applications 

      Pelich, Ramona; Chini, Marco; Hostache, Renaud; Matgen, Patrick; López Martínez, Carlos (2020-10)
      Article
      Accés obert
      This letter addresses the use of the Sentinel-1 time series with the aim of proposing an automatic and unsupervised coastline detection method that averages the dynamical variations of coastal areas over a limited period ...
    • Coherence estimation in synthetic aperture radar data based on speckle noise modeling 

      López Martínez, Carlos; Pottier, Eric (Optical Society of America, 2007-02-28)
      Article
      Accés obert
      In the past we proposed a multidimensional speckle noise model to which we now include systematic phase variation effects. This extension makes it possible to define what is believed to be a novel coherence model able to ...
    • Crop classification of multitemporal PolSAR based on 3-D attention module with ViT 

      Yin, Qiang; Lin, Zhiyuan; Hu, Wei; López Martínez, Carlos; Ni, Jun; Zhang, Fan (Institute of Electrical and Electronics Engineers (IEEE), 2023-04-26)
      Article
      Accés obert
      Multitemporal polarimertic SAR is considered to be very effective in crop classification and cultivated land detection, which has received much attention from researchers. Currently, for most multitemporal polarimetric SAR ...
    • Differential SAR interferometry with orbital, airborne and ground-based sensors 

      Monells Miralles, Daniel; Mallorquí Franquet, Jordi Joan; Aguasca Solé, Alberto; Broquetas Ibars, Antoni; Fabregas Canovas, Francisco Javier; López Martínez, Carlos; Alonso González, Alberto; Iglesias González, Rubén; Centolanza, Giuseppe (2011)
      Comunicació de congrés
      Accés obert
      • Introduction to Differential Interferometry • Orbital Sensors: ERS, ENVISAT, RADARSAT2, TerraSAR-X. • Airborne Sensors: DLR’s E-SAR • Ground-Based Sensors: UPC’s GB-SAR • Conclusions
    • DNN-based PolSAR image classification on noisy labels 

      Ni, Jun; Xiang, Deliang; Lin, Zhiyuan; López Martínez, Carlos; Hu, Wei; Zhang, Fan (2022-04-22)
      Article
      Accés obert
      Deep neural networks (DNNs) appear to be a solution for the classification of polarimetric synthetic aperture radar (PolSAR) data in that they outperform classical supervised classifiers under the condition of sufficient ...
    • Dual-polarimetric descriptors from Sentinel-1 GRD SAR data for crop growth assessment 

      Bhogapurapu, Narayanarao; Dey, Subhadip; Bhattacharya, Avik; Mandal, Dipankar; López Sánchez, Juan Manuel; McNairn, Heather; López Martínez, Carlos; Rao, Yalamanchili S. (2021-08)
      Article
      Accés obert
      Accurate and high-resolution spatio-temporal information about crop phenology obtained from Synthetic Aperture Radar (SAR) data is an essential component for crop management and yield estimation at a local scale. Crop ...
    • 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 ...