Now showing items 1-10 of 10

    • Assessment of multi-scale SMOS and SMAP soil moisture products across the Iberian Peninsula 

      Portal González, Gerard; Jagdhuber, Thomas; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Pablos Hernánez, Miriam; Entekhabi, Dara; Piles, María (Multidisciplinary Digital Publishing Institute (MDPI), 2020-02-01)
      Article
      Open Access
      In the last decade, technological advances led to the launch of two satellite missions dedicated to measure the Earth’s surface soil moisture (SSM): the ESA’s Soil Moisture and Ocean Salinity (SMOS) launched in 2009, and ...
    • 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 ...
    • 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)
      Article
      Open Access
      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 ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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)
      Article
      Open Access
      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 ...
    • Mapping carbon stocks in Central and South America with smap vegetation optical depth 

      Chaparro Danon, David; Duveiller, Gregory; Piles, María; Vall-Llossera Ferran, Mercedes Magdalena; Cescatti, A.; Camps Carmona, Adriano José; Entekhabi, Dara (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference lecture
      Restricted access - publisher's policy
      Mapping carbon stocks in the tropics is essential for climate change mitigation. Passive microwave remote sensing allows estimating carbon from deep canopy layers through the Vegetation Optical Depth (VOD) parameter. ...
    • 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
      Open Access
      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 ...
    • Sensitivity of L-band vegetation optical depth to carbon stocks in tropical forests: a comparison to higher frequencies and optical indices 

      Chaparro Danon, David; Duveiller, Grégory; Piles de la Fuente, María Pilar; Cescatti, Alessandro; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Entekhabi, Dara (2019-10-01)
      Article
      Restricted access - publisher's policy
      Monitoring vegetation carbon in tropical regions is essential to the global carbon assessment and to evaluate the actions oriented to the reduction of forest degradation. Mainly, satellite optical vegetation indices and ...
    • SMAP multi-temporal vegetation optical depth retrieval as an indicator of crop yield trend and crop composition 

      Chaparro Danon, David; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Piles de la Fuente, María Pilar; Konings, Alexandra G.; Entekhabi, Dara (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      Vegetation Optical Depth (VOD) is related to Vegetation Water Content (VWC). This provides new and highly valuable information for ecological and agricultural studies. In this work, VOD from the Soil Moisture Active-Passive ...
    • 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
      Restricted access - publisher's policy
      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 ...