Exploració per autor "López Martínez, Carlos"
Ara es mostren els items 32-51 de 131
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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 obertThis 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 obertThis 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 obertIn 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 obertMultitemporal 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 obertDeep 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 obertAccurate 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 obertThis 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 obertVegetation 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'editorialCharacterization 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 obertIn 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'editorialThis 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 obertRatio 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 obertThis 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 ...