Now showing items 1-20 of 38

  • 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)
    Article
    Open Access
    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 ...
  • 3Cat-3/MOTS nanosatellite mission for optical multispectral and GNSS-R Earth Observation: concept and analysis 

    Castellví Esturi, Jordi; Camps Carmona, Adriano José; Corbera Fauria, Jordi; Alamús, Ramón (Multidisciplinary Digital Publishing Institute (MDPI), 2018-01-06)
    Article
    Open Access
    The 3Cat-3/MOTS (3: Cube, Cat: Catalunya, 3: 3rd CubeSat mission/Missió Observació Terra Satèl·lit) mission is a joint initiative between the Institut Cartogràfic i Geològic de Catalunya (ICGC) and the Universitat Politècnica ...
  • 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
    Restricted access - publisher's policy
    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 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)
    Conference report
    Restricted access - publisher's policy
    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, ...
  • Caracterització de Crostes. Evolució de la impedància mecànica respecte la humitat del sòl 

    Corretja March, Ignasi; Miras de Mena, Carlota (Universitat Politècnica de Catalunya, 2012-01)
    Master thesis (pre-Bologna period)
    Open Access
    El treball final de carrera següent pretén analitzar la relació entre la resistència mecànica a la penetració i la humitat del sòl de les crostes generades. Els sòls al rebre l’impacte de les gotes de pluja i/o per la ...
  • Combining SMOS with visible and near/shortwave/thermal infrared satllite 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)
    Article
    Restricted access - publisher's policy
    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)
    Article
    Open Access
    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) ...
  • Dual-polarization GNSS-R interference pattern technique for soil moisture mapping 

    Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Aguasca Solé, Alberto; Forte Veliz, Giuseppe Francesco; Monerris Belda, Alessandra; Rudiger, Christoph; Walker, Jeffrey; Hyuk, Park; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl (2014-05-01)
    Article
    Restricted access - publisher's policy
    The interference pattern technique (IPT) consists of the coherent addition of the direct and reflected global navigation satellite systems (GNSS) signals in the receiving antenna. The detected power oscillates (fading), ...
  • Estudio de la medida de la humedad del suelo mediante reflectometría GPS 

    Castro Nuñez, Victor de (Universitat Politècnica de Catalunya, 2013-11-26)
    Master thesis (pre-Bologna period)
    Open Access
    Following the advance in climate change on our planet, appears the need to study accurately the weather of Earth. In this PFC, Soil Moisture (SM) has been the focus of study , which is one of the fundamental parameters to ...
  • Evaluación de las medidas de humedad de suelo generadas con datos disgregados de satélite a escala de parcela agrícola 

    Fontanet Ambrós, Mireia; Fernández García, Daniel; Ferrer, Fernado; Rodrigo, G (2017)
    Conference report
    Open Access
    El interés de medir la humedad de suelo a escala de parcela de cultivo mediante teledetección ha aumentado debido a la fácil disponibilidad de los datos y, que a diferencia de los sensores de humedad de suelo, no es necesario ...
  • 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)
    Article
    Open Access
    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 ...
  • Geolocalizing SMOS RFI sources on the densely populated East Asia 

    Hyuk, Park; Camps Carmona, Adriano José; Gonzalez Gambau, Verónica (2015)
    Conference report
    Restricted access - publisher's policy
    In the SMOS measurements, the negative effect of RadioFrequency Interference (RFI) is clearly present, deteriorating the Brightness Temperature (BT) images. RFI sources have to be monitored and accurately geolocated in ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Impact of amplitude calibration errors on SMOS global images 

    Durán Martínez, Israel; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Oliva, Roger; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Restricted access - publisher's policy
    Some of the artifacts observed in SMOS brightness temperature images are originated in an inconsistency between correlation and antenna temperature calibration errors, which produces a multiplicative bias that scales with ...
  • Impact of day/night time land surface temperature in soil moisture disaggregation algorithms 

    Pablos Hernánez, Miriam; Piles Guillem, Maria; Sánchez, Nilda; Vall-Llossera Ferran, Mercedes Magdalena; Martinez Fernandez, Jose; Camps Carmona, Adriano José (2016-09-15)
    Article
    Open Access
    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 soil moisture on crop yields over Brazilian semiarid 

    Rossato, Luciana; Alvalá Célia dos Santos, Regina; Marengo Antônio, José; Zeri, Marcelo; Cunha M. do Amaral, Ana Paula; Pires Bassi Marinho, Luciana; Barbosa Alves, Humberto (2017-11-07)
    Article
    Open Access
    The objective of this work was to investigate the relationship between soil water content and rainfall with rice, beans, cassava and corn yields in the semiarid region of Northeast Brazil. Precipitation and modeled soil ...
  • Impact of soil moisture over Palmer Drought Severity Index and its future projections in Brazil Avaliação da umidade do solo e do Índice de Severidade de Seca de Palmer no Brasil e suas projeções futuras 

    Rossato, Luciana; Marengo, Jose Antonio; Frederico de Angelis, Carlos; Marinho Pires, Luciana Bassi; Mario Mendiondo, Eduardo (2017-06-22)
    Article
    Open Access
    Soil moisture is a main factor for the study of drought impacts on vegetation. Drought is a regional phenomenon and affects the food security more than any other natural disaster. Currently, the monitoring of different ...
  • Impact of the local oscillator calibration rate on the SMOS measurements and retrieved salinities 

    Gabarró Prats, Carolina; Gonzalez Gambau, Verónica; Corbella Sanahuja, Ignasi; Torres Torres, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2013-09-02)
    Article
    Restricted access - publisher's policy
    The local oscillators (LOs) of the Soil Moisture and Ocean Salinity mission payload are used to shift the operating frequency of the 72 receivers to an optimal intermediate frequency needed for the signal processing. ...
  • 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
    Open Access
    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 ...
  • 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)
    Conference lecture
    Restricted access - publisher's policy
    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 ...