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    • 2000 days of SMOS at the Barcelona Expert Centre: a tribute to the work of Jordi Font 

      Turiel Martínez, Antonio; Piles Guillem, Maria; González Gambau, V.; Ballabrera Poy, Joaquim; Gabarró Prats, Carolina; Martinez, Justino; Olmedo, Estrella; Portabella, Marcos; Pérez López, Fernando; Solé Ollé, Jordi (2016-09-01)
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      Soil Moisture and Ocean Salinity (SMOS) is the first satellite mission capable of measuring sea surface salinity and soil moisture from space. Its novel instrument (the L-band radiometer MIRAS) has required the development ...

    • A downscaling approach for SMOS land observations: evaluation of high-resolution soil moisture maps over the Iberian Peninsula 

      Piles Guillem, Maria; Sanchez, Nilda; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Martinez Fernandez, Jose; Martinez, Justino; González Gambau, Veronica (2014-09-01)
      Article
      Accés restringit per política de l'editorial
      The ESA's Soil Moisture and Ocean Salinity (SMOS) mission is the first satellite devoted to measure the Earth's surface soil moisture. It has a spatial resolution of similar to 40 km and a 3-day revisit. In this paper, a ...

    • A downscaling approach to combine SMOS multi-angular and full-polarimetric observations with MODIS VIS/IR data into high resolution soil moisture maps 

      Piles Guillem, Maria; Vall-Llossera Ferran, Mercedes Magdalena; Laguna, Laia; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      A downscaling algorithmfor SMOS which combines MODIS Visible/Infrared data and SMOS horizontal brightness temperatures at 42.5◦ incidence angle into high-resolution soil moisture maps has been shown to nicely reproduce ...

    • A new space technology for ocean observation: the SMOS mission 

      Font Ferré, Jordi; Ballabrera Poy, Joaquim; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Durán Martínez, Israel; Emelianov Kolomitski, Mikhail; Enrique González, Luis; Fernández Gallego, Pedro; Gabarró Prats, Carolina; González, Cristina; González, Veronica; Gourrion, J.; Guimbard, S.; Hoareau, N.; Julià, A; Kalaroni, S.; Konstantinidou, Anna; Aretxabaleta, L.; Martínez, Justino; Miranda, Jorge Miguel; Monerris Belda, Alessandra; Montero, Sergio; Mourre, B.; Pablos Hernández, Miriam; Pérez Villar, Fernando; Piles Guillem, Maria; Portabella, M.; Sabia, R.; Salvador, Joaquin; Talone, Marco; Torres Torres, Francisco; Turiel Martínez, Antonio; Vall-Llossera Ferran, Mercedes Magdalena; Villarino Villarino, Ramón (2012)
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      Capability for sea surface salinity observation was an important gap in ocean remote sensing in the last few decades of the 20th century. New technological developments during the 1990s at the European Space Agency led to ...

    • A sensitivity study of land surface temperature to soil moisture using in-situ and spaceborne observations 

      Pablos Hernández, Miriam; Piles Guillem, Maria; Sanchez, Nilda; Gonzalez Gambau, Verónica; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Martinez Fernandez, Jose (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Surface Soil Moisture (SSM) affects the soil surface energy balance and thus affects the Land Surface Temperature (LST), and viceversa. Currently, LST and SSM are remotely sensed using TIR sensors and L-band radiometers, ...

    • Combining SMOS with visible and near/shortwave/thermal infrared satellite data for high resolution soil moisture estimates 

      Sanchez Ruiz, Sergio; Piles Guillem, Maria; Sanchez, Nilda; Martinez Fernandez, Jose; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José (Elsevier, 2014-08-04)
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      Sensors in the range of visible and near-shortwave-thermal infrared regions can be used in combination with passive microwave observations to provide soil moisture maps at much higher spatial resolution than the original ...

    • Comparing surface-soil moisture from the SMOS mission and the ORCHIDEE land-surface model over the Iberian Peninsula 

      Polcher, Jan; Piles Guillem, Maria; Gelati, Emiliano; Barella Ortiz, Anais; Tello Alonso, Marivi (2016-03-01)
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      Accés obert
      The aim of this study is to compare the surface soil moisture (SSM) retrieved from ESA's Soil Moisture and Ocean Salinity mission (SMOS) with the output of the ORCHIDEE (ORganising Carbon and Hydrology In Dynamic EcosystEm) ...

    • Extended triple collocation: estimating errors and correlation coefficients with respect to an unknown target 

      McColl, Kaighin Alexander; Vogelzang, Jur; Konings, Alexandra G.; Entekhabi, Dara; Piles Guillem, Maria; Stoffelen, Ad (2014-09-16)
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      Accés obert
      Calibration and validation of geophysical measurement systems typically require knowledge of the true value of the target variable. However, the data considered to represent the true values often include their own measurement ...

    • From experimental campaigns to BEC - CP34 salinity products: Tribute to the Contributions of prof. 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, Antonio; Portabella, Marcos; Ballabrera-Poy, Joaquim; González-Gambau, Verónica; Martínez, Justino; Villarino Villarino, Ramón; Enrique, Luis; Monerris Belda, Sandra; Bosch, Xavier; Sabia, Roberto; Talone, Marco; Piles Guillem, Maria; Pablos Hernández, Miriam; Valencia, Enric (2016-09-01)
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      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 ...

    • 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 ...

    • How many parameters can be maximally estimated from a set of measurements? 

      Konings, Alexandra G.; McColl, Kaighin Alexander; Piles Guillem, Maria; Entekhabi, Dara (2015-05-01)
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      Accés obert
      Remote sensing algorithms often invert multiple measurements simultaneously to retrieve a group of geophysical parameters. In order to create a robust retrieval algorithm, it is necessary to ensure that there are more ...

    • 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)
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      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 the local oscillator calibration on the SMOS sea surface salinity maps 

      Gabarró Prats, Carolina; González-Gambau, Verónica; Martínez, J.; Guimbard, S.; Gourrion, J.; Piles Guillem, Maria; Portabella, M.; Font, J. (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      The Local Oscillators (LO) of the Microwave Imaging Radiometer using Aperture Synthesis (MIRAS) onboard the Soil Moisture and Ocean Salinity (SMOS) satellite are used to maintain the operating frequency of the 69 receivers. ...

    • 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 ...

    • 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 ...

    • 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. ...

    • L-band vegetation optical depth seasonal metrics for crop yield assessment 

      Chaparro Danon, David; Piles Guillem, Maria; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Konings, Alexandra G.; Entekhabi, Dara (2018-06-01)
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      Accés obert
      Attenuation of surface microwave emission due to the overlying vegetation is proportional to the density of the canopy and to its water content. The vegetation optical depth (VOD) parameter measures this attenuation. VOD ...

    • Low soil moisture and high temperatures as indicators for forest fire occurrence and extent across the Iberian Peninsula 

      Chaparro Danon, David; Vall-Llossera Ferran, Mercedes Magdalena; Piles Guillem, Maria; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      Fires are a concerning topic in Mediterranean areas. They are increasing in number and extension, probably due to the anomalous dry and hot conditions experienced in this region in the last decade. In this study, more than ...