Ara es mostren els items 64-83 de 164

    • From field experiments to salinity products: a tribute to the contributions of Jordi Font to the SMOS mission 

      Camps Carmona, Adriano José; Gabarró Prats, Carolina; Vall-Llossera Ferran, Mercedes Magdalena; Blanch Boris, Sebastián; Aguasca Solé, Alberto; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Turiel Martínez, Antonio; Portabella, Marcos; Ballabrera Poy, Joaquim; González Gambau, V.; Martinez, Justino; Villarino Villarino, Ramón; Monerris Belda, Sandra; Bosch Lluís, Xavier; Sabia, Roberto; Talone, Marco; Piles Guillem, Maria; Pablos Hernández, Miriam; Valencia Domènech, Enric (2016-09-01)
      Article
      Accés obert
      This article summarizes some of the activities in which Jordi Font, research professor and head of the Department of Physical and Technological Oceanography, Institut de Ciències del Mar (CSIC, Spanish National Research ...
    • Global L-band vegetation volume fraction estimates for modeling vegetation optical depth 

      Chaparro Danon, David; Jagdhuber, Thomas; Piles Guillem, María; Entekhabi, Dara; Jonard, François; Fluhrer, Anke; Feldman, Andrew F.; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      The attenuation of microwave emissions through the canopy is quantified by the vegetation optical depth (VOD), which is related to the amount of water, the biomass and the structure of vegetation. To provide microwave-derived ...
    • 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 ...
    • High frequency radar cross section of complex objects in real time 

      Rius Casals, Juan Manuel; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 1991)
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      It is shown that real-time RCS (radar cross section) computation is possible with a high-performance graphics workstation. Physical optics (PO) and physical theory of diffraction (PTD) approximation are computed using the ...
    • High frequency RCS graphical processing 

      Rius Casals, Juan Manuel; Cardama Aznar, Ángel; Vall-Llossera Ferran, Mercedes Magdalena (1990)
      Text en actes de congrés
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      The results presented at this workshop have been obtained with a new and original approach: hardware graphical processing. High-frequency RCS of complex radar targets is computed in real time using a 3-D graphic workstation. ...
    • High-Frequency RCS of Perfectly Conducting or Coated Complex Objects in Real Time 

      Rius Casals, Juan Manuel; Vall-Llossera Ferran, Mercedes Magdalena; Cardama Aznar, Ángel (1991)
      Text en actes de congrés
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      This paper present a new and original approach to compute high-freqency radar cross section (RCS) of complex radar targets in real time using a 3-D graphic workstation. The aircraft is modelled with I-DEAS solid modeling ...
    • Hyperspectral-derived indices for soil moisture estimation at very high resolution 

      Sanchez, Nilda; Martinez Fernandez, Jose; Piles Guillem, Maria; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Aguasca Solé, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Hyperspectral indices from the Compact Airborne Spectrographic Imager (CASI 550), together with land surface temperatures from the Thermal Airborne Spectrographic Imager (TASI 600) and brightness temperatures from a L-band ...
    • Ice thickness effects on Aquarius brightness temperatures over Antarctica 

      Pablos Hernández, Miriam; Piles Guillem, Maria; Gonzalez Gambau, Verónica; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (2015-04-01)
      Article
      Accés obert
      The Dome-C region, in the East Antarctic Plateau, is regarded as an ideal natural laboratory for calibration/validation of space-borne microwave radiometers. At L-band, the thermal stability of this region has been confirmed ...
    • Impact of day/night time land surface temperature in soil moisture disaggregation algorithms 

      Pablos Hernández, Miriam; Piles Guillem, Maria; Sánchez, Nilda; Vall-Llossera Ferran, Mercedes Magdalena; Martinez Fernandez, Jose; Camps Carmona, Adriano José (2016-09-15)
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      Accés obert
      Since its launch in 2009, the ESA’s SMOS mission is providing global soil moisture (SM) maps at ~40 km, using the first L-band microwave radiometer on space. Its spatial resolution meets the needs of global applications, ...
    • 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)
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      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 ...
    • Improved MUSIC-based SMOS RFI source detection and geolocation algorithm 

      Hyuk, Park; Gonzalez Gambau, Verónica; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 2016-03-01)
      Article
      Accés obert
      The European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission has been providing L-band brightness temperature (BT) using its instrument, the Microwave Imaging Radiometer using Aperture Synthesis. In the ...
    • Incidence angle diversity on L-band microwave radiometry and its impact on consistent soil moisture retrievals 

      Portal González, Gerard; Vall-Llossera Ferran, Mercedes Magdalena; Jagdhuber, Thomas; Camps Carmona, Adriano José; Pablos Hernández, Miriam; Piles Guillem, María (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      Incidence angle diversity of space-borne L-band radiometers needs to be taken into account for a consistent estimation of surface soil moisture (SM). In this study, the Land Parameter Retrieval Model (LPRM) is applied to ...
    • Influence of ice thickness on SMOS and Aquarius brightness temperature over Antarctica 

      Pablos Hernández, Miriam; Piles Guillem, Maria; Gonzalez Gambau, Verónica; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      The Dome-C region, in the East Antarctic Plateau, has been used for calibration/validation of satellite microwave radiometers since the 1970's. However, its use as an independent external target has been recently questioned ...
    • Influence of quality filtering approaches in BEC SMOS L3 soil moisture products 

      Pablos Hernández, Miriam; Vall-Llossera Ferran, Mercedes Magdalena; Piles, María; Camps Carmona, Adriano José; González-Haro, Cristina; Turiel, Antonio; Herbert, Christoph Josef; Chaparro Danon, David; Portal González, Gerard (2019)
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      Global Soil Moisture and Ocean Salinity (SMOS) Level 3 (L3) soil moisture (SM) products are being routinely distributed by the Barcelona Expert Centre (BEC). The quality and accuracy of these SM products have been demonstrated ...
    • Inter-comparison of SMOS and aquarius brightness temperatures at L-band over selected targets 

      Pablos Hernández, Miriam; Piles Guillem, Maria; González Gambau, Veronica; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      The spectral window at L-band (1.400 - 1.427 GHz) is reserved for passive microwave remote sensing. This band is well-suited to retrieve soil moisture and ocean salinity due to emissivity of soil and seawater decreases ...
    • Interferometric radiometry and its applications 

      Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena (1999)
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    • L-band aperture synthesis radiometry: hardware requirements and system performance 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena (IEEE Piscataway, 2000)
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      Aperture synthesis radiometry is becoming a feasible concept for imaging applications, especially at low microwave frequencies where it takes clear advantage of the absence of mechanical antenna motion. A 2D interferometric ...
    • L-Band sea surface emissivity: preliminary results of the WISE-2000 campaign and its application to salinity retrieval in the SMOS mission 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria; Torres Torres, Francisco; Villarino Villarino, Ramón; Enrique, L; Julbé, F; Font Capafons, Josep; Julià, A; Gabarró, C; Etcheto, J; Boutin, J; Weill, A; Caselles Costa, Vicent; Rubio, E; Wursteisen, P (2003-06)
      Article
      Accés obert
      Soil moisture and ocean salinity at surface level can be measured by passive microwave remote sensing at L-band. To provide global coverage data of soil moisture and ocean salinity with three-day revisit time, the Earth ...
    • L-Band Sea Surface Emissivity: Preliminary Results Of The WISE-2000 Campaign And Its Application To Salinity Retrieval In the SMOS Mission 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria; Torres Torres, Francisco; Villarino Villarino, Ramón; Enrique, L.; Julbé, F.; Font, Jordi; Julià, A.; Gabarró Prats, Carolina; Etcheto, Jacqueline; Boutin, Jacqueline; Weill, Alain; Caselles, Vicente; Rubio, Eva; Wursteisen, Patrick (2003-06-30)
      Article
      Accés obert
      Soil moisture and ocean salinity at surface level can be measured by passive microwave remote sensing at L-band. To provide global coverage data of soil moisture and ocean salinity with three-day revisit time, the Earth ...
    • L-Band vegetation optical depth for crop phenology monitoring and crop yield assessment 

      Chaparro Danon, David; Piles Guillem, Maria; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Konings, Alexandra G.; Entekhabi, Dara; Jagdhuber, Thomas (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Vegetation Optical Depth (VOD) at L-band is highly sensitive to the water content and above-ground biomass of vegetation. Hence, it has great potential for monitoring crop phenology and for providing crop yield forecasts. ...