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Ara es mostren els items 21-36 de 36

    • Microwave and optical data fusion for global mapping of soil moisture at high resolution 

      Portal González, Gerard; Vall-Llossera Ferran, Mercedes Magdalena; Piles Guillem, Maria; Camps Carmona, Adriano José; Chaparro Danon, David; Pablos Hernández, Miriam; Rossato, Luciana; Aabouch, Khalid (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      After more than 8 years in orbit the Soil Moisture and Ocean Salinity (SMOS) satellite is still in good health and several algorithms for improving its spatial resolution have been proposed and validated in a variety of ...

    • Modelling forest decline using SMOS soil moisture and vegetation optical depth 

      Chaparro Danon, David; Piles Guillem, Maria; Martínez Vilalta, Jordi; Vall-Llossera Ferran, Mercedes Magdalena; Vayreda, Jordi; Banque, Mireia; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Global change is increasing the risk of forest decline worldwide, impacting carbon and water cycles. Hence, there is an urgent need for predicting forest decline occurrence. To that purpose, this study links forest decline ...

    • Multi-temporal evaluation of soil moisture and land surface temperature dynamics using in situ and satellite observations 

      Pablos Hernández, Miriam; Martínez Fernández, José; Piles Guillem, Maria; Sánchez, Nilda; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José (2016-07-11)
      Article
      Accés obert
      Soil moisture (SM) is an important component of the Earth’s surface water balance and by extension the energy balance, regulating the land surface temperature (LST) and evapotranspiration (ET). Nowadays, there are two ...

    • Multiscale soil moisture retrievals from microwave remote sensing observations 

      Piles Guillem, Maria (Universitat Politècnica de Catalunya, 2010-07-16)
      Tesi
      Accés obert
      La humedad del suelo es la variable que regula los intercambios de agua, energía, y carbono entre la tierra y la atmósfera. Mediciones precisas de humedad son necesarias para una gestión sostenible de los recursos hídricos, ...

    • On the synergy of airborne GNSS-R and landsat 8 for soil moisture estimation 

      Sanchez, Nilda; Alonso Arroyo, Alberto; Martinez Fernandez, Jose; Piles Guillem, Maria; Gonzalez Zamora, Angel; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (2015-08-01)
      Article
      Accés obert
      While the synergy between thermal, optical, and passive microwave observations is well known for the estimation of soil moisture and vegetation parameters, the use of remote sensing sources based on the Global Navigation ...

    • On the synergy of SMOS and Terra/Aqua MODIS: high resolution soil moisture maps in near real-time 

      Piles Guillem, Maria; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Sanchez, Nilda; Martinez Fernandez, Jose; Martinez, Justino; Gonzalez Gambau, Verónica; Riera, R. (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      An innovative downscaling approach to obtain fine-scale soil moisture estimates from 40 km SMOS observations has been developed. It optimally blends SMOS multi-angular and full-polarimetric information with MODIS visible/data ...

    • Predicting the extent of wildfires using remotely sensed soil moisture and temperature trends 

      Chaparro Danon, David; Vall-Llossera Ferran, Mercedes Magdalena; Piles Guillem, Maria; Camps Carmona, Adriano José; Rudiger, Christoph; Riera Tatche, Ramón (Institute of Electrical and Electronics Engineers (IEEE), 2016-06-01)
      Article
      Accés obert
      Recent climate trends evidence a rise of temperatures and an increase in the duration and intensity of droughts which is in turn leading to the occurrence of larger wildfires, which threaten the environment as well as human ...

    • Sensitivity of Aquarius active and passive measurements temporal covariability to land surface characteristics 

      Piles Guillem, Maria; McColl, Kaighin A.; Entekhabi, Dara; Das, Narendra; Pablos Hernández, Miriam (Institute of Electrical and Electronics Engineers (IEEE), 2015-03-16)
      Article
      Accés obert
      Active and passive microwave observations over land are affected by surface characteristics in different ways. L-band radar backscatter and radiometer measurements each have distinct advantages and problematic issues when ...

    • SMOS and aquarius radiometers: inter-comparison over selected targets 

      Pablos Hernández, Miriam; Piles Guillem, Maria; González Gambau, Veronica; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Martinez, Justino (2014-09-01)
      Article
      Accés restringit per política de l'editorial
      Passive microwave remote sensing at L-band is considered to be the most suitable technique to measure soil moisture and ocean salinity. These two variables are needed as inputs of predictive models, to improve climate and ...

    • SMOS and climate data applicability for analyzing forest decline and forest fires 

      Chaparro Danon, David; Vayreda, Jordi; Martínez Vilalta, Jordi; Vall-Llossera Ferran, Mercedes Magdalena; Banque, Mireia; Camps Carmona, Adriano José; Piles Guillem, Maria (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Forests partially reduce climate change impact but, at the same time, this climate forcing threatens forest's health. In recent decades, droughts are becoming more frequent and intense implying an increase of forest decline ...

    • SMOS CP34 soil moisture and ocean salinity maps 

      Font Ferré, Jordi; Gabarró Prats, Carolina; Ballabrera Poy, Joaquim; Turiel Martínez, Antonio; Martínez, Justino; Umbert, M.; Pérez, Francisco C.; Hoareau, N.; Portabella, M.; González Gambau, Veronica; Gourrion, J.; Guimbard, S.; Piles Guillem, Maria; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (2012)
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      This paper presents the soil moisture and ocean salinity maps from the SMOS mission generated operationally by the Spanish SMOS Level 3 and 4 data processing center (CP34) and experimentally by the SMOS Barcelona Expert ...

    • Spatial patterns of SMOS downscaled soil moisture maps over the remedhus network (Spain) 

      Sanchez, Nilda; Piles Guillem, Maria; Scaini, Anna; Martinez Fernandez, Jose; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      This paper describes the relationships found between remotely sensed soil moisture, in situ observed soil moisture, and spatial distribution of soil and climatic factors. For the comparison between remote and in situ soil ...

    • Surface moisture and temperature trends anticipate drought conditions linked to wildfire activity in the Iberian Peninsula 

      Chaparro Danon, David; Piles Guillem, Maria; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José (2016-01-01)
      Article
      Accés obert
      In this study, drought conditions involving risk of fires are detected applying SMOS-derived soil moisture data and land surface temperature models. Moisture-temperature (SM-LST) patterns studied between 2010 and 2014 were ...

    • Towards improved spatio-temporal resolution soil moisture retrievals from the synergy of SMOS and MSG SEVIRI spaceborne observations 

      Piles Guillem, Maria; Petropoulos, George P.; Sánchez, Nilda; González Zamora, Ángel; Ireland, Gareth (2016-07-01)
      Article
      Accés obert
      Earth Observation (EO) technology is today at a maturity level that allows deriving operational estimates of Surface Soil Moisture (SSM) from a variety of sensors; yet, such products are provided at present at a coarse ...

    • Uncertainty analysis of soil moisture and vegetation indices using aquarius scatterometer observations 

      McColl, Kaighin Alexander; Entekhabi, Dara; Piles Guillem, Maria (Institute of Electrical and Electronics Engineers (IEEE), 2014-07-01)
      Article
      Accés restringit per política de l'editorial
      Simple functions of radar backscatter coefficients have been proposed as indices of soil moisture and vegetation, such as the radar vegetation index, i.e., RVI, and the soil saturation index, i.e., m(s). These indices are ...

    • Validation of SMOS L2 and L3 soil moisture products over the Duero basin at different spatial scales 

      Gonzalez Zamora, Angel; Sanchez, Nilda; Gumuzzio, Angela; Piles Guillem, Maria; Olmedo, Edson; Martinez Fernandez, Jose (International Society for Photogrammetry and Remote Sensing (ISPRS), 2015)
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      An increasing number of permanent soil moisture measurement networks are nowadays providing the means for validating new remotely sensed soil moisture estimates such as those provided by the ESA's Soil Moisture and Ocean ...