• Accuracy of methods for field assessment of rill and ephemeral gully erosion 

      Casalí Sarasíbar, Javier Upna; Loizu Maeztu, Javier Upna; Campo Bescós, Miguel Ángel Upna; Santisteban Comino, Luisa María de; Álvarez Mozos, Jesús Upna (Elsevier, 2006)   Artículo / Artikulua  OpenAccess
      To properly assess soil erosion in agricultural areas, it is necessary to determine precisely the volume of ephemeral gullies and rills in the field by using direct measurement procedures. However, little information is ...
    • The added value of stratified topographic correction of multispectral images 

      Sola Torralba, Ion Upna; González Audicana, María Upna; Álvarez Mozos, Jesús Upna (MDPI, 2016)   Artículo / Artikulua  OpenAccess
      Satellite images in mountainous areas are strongly affected by topography. Different studies demonstrated that the results of semi-empirical topographic correction algorithms improved when a stratification of land covers ...
    • Automatic detection of uprooted orchards based on orthophoto texture analysis 

      Ciriza Labiano, Raquel; Sola Torralba, Ion Upna; Albizua, Lourdes; Álvarez Mozos, Jesús Upna; González Audicana, María Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      Permanent crops, such as olive groves, vineyards and fruit trees, are important in European agriculture because of their spatial and economic relevance. Agricultural geographical databases (AGDBs) are commonly used by ...
    • Clasificación de cultivos en la zona media de Navarra mediante imágenes radar polarimétricas 

      Larrañaga, Arantzazu Upna; Albizua, Lourdes; Álvarez Mozos, Jesús Upna (Universidad Politécnica de Valencia, 2010)   Artículo / Artikulua  OpenAccess
      Navarra lleva años empleando la técnica de clasificación supervisada de imágenes multiespectrales de satélite para la realización de la estadística agraria. La cubierta nubosa, muy habitual en esta zona, limita e incluso ...
    • Desarrollo de productos avanzados para la misión SEOSAT/Ingenio 

      Sabater, N.; Ruiz Verdú, A.; Delegido, J.; Fernández Beltrán, R.; Latorre Carmona, P.; Pla, F.; González Audicana, María Upna; Álvarez Mozos, Jesús Upna; Sola Torralba, Ion Upna; Villa, G.; Tejeiro, J. A.; Miguel, E. de; Jiménez, M.; Molina, S.; Moreno, J. (Universitat Politecnica de Valencia, 2016)   Artículo / Artikulua  OpenAccess
      SEOSAT/Ingenio es la futura misión española de observación de la Tierra en el óptico en alta resolución espacial. Mientras que los productos de imagen a Nivel 1, radiancias geo-referenciadas a nivel de sensor, se encuentran ...
    • Effective roughness modelling as a tool for soil moisture retrieval from C-and L-band SAR 

      Lievens, Hans; Verhoest, Niko E. C.; Keyser, E. de; Vernieuwe, Hilde; Matgen, P.; Álvarez Mozos, Jesús Upna; Baets, Bernard de (Copernicus Publications, 2011)   Artículo / Artikulua  OpenAccess
      Soil moisture retrieval from Synthetic Aperture Radar (SAR) using state-of-the-art backscatter models is not fully operational at present, mainly due to difficulties involved in the parameterisation of soil surface ...
    • Effects of spatial sampling interval on roughness parameters and microwave backscatter over agricultural soil surfaces 

      Barber, Matías Ernesto; Grings, Francisco Matías; Álvarez Mozos, Jesús Upna; Piscitelli, Marcela; Perna, Pablo Alejandro; Karszenbaum, Haydee (MDPI, 2016)   Artículo / Artikulua  OpenAccess
      The spatial sampling interval, as related to the ability to digitize a soil profile with a certain number of features per unit length, depends on the profiling technique itself. From a variety of profiling techniques, ...
    • Error in radar-derived soil moisture due to roughness parameterization: an analysis based on synthetical surface profiles 

      Lievens, Hans; Vernieuwe, Hilde; Álvarez Mozos, Jesús Upna; Baets, Bernard de; Verhoest, Niko E. C. (MDPI, 2009)   Artículo / Artikulua  OpenAccess
      In the past decades, many studies on soil moisture retrieval from SAR demonstrated a poor correlation between the top layer soil moisture content and observed backscatter coefficients, which mainly has been attributed ...
    • Evaluación multitemporal de métodos de corrección topográfica mediante el uso de imágenes sintéticas multiespectrales 

      Sola Torralba, Ion Upna; Álvarez Mozos, Jesús Upna; González Audicana, María Upna; Torres Escribano, José Luis Upna (Asociación Española de Teledetección, 2014)   Artículo / Artikulua  OpenAccess
      En este trabajo se presentan los resultados de la evaluación multitemporal de varios métodos de corrección topográfica (TOC), cuya bondad se determina de forma cuantitativa mediante el uso de imágenes sintéticas multiespectrales ...
    • Evaluation of 2D models for the prediction of surface depression storage using realistic reference values 

      Giménez Díaz, Rafael Upna; Mezkiritz Barberena, Irantzu; Campo-Bescós, Miguel Upna; Álvarez-Mozos, Jesús Upna; González-Audicana, María Upna; Martínez de Aguirre Escobar, Alejandro Upna; Casalí Sarasíbar, Javier Upna (Wiley, 2016)   Artículo / Artikulua  OpenAccess
      Depression storage (DS) is the maximum storage of precipitation and runoff in the soil surface at a given slope. The DS is determined by soil roughness that in agricultural soils is largely affected by tillage. The direct ...
    • Evaluation of surface roughness parameters in agricultural soils with different tillage conditions using a laser profile meter 

      Martínez de Aguirre Escobar, Alejandro Upna; Álvarez Mozos, Jesús Upna; Giménez Díaz, Rafael Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      Surface roughness crucially affects the hydrological and erosive behaviours of soils. In agricultural areas surface roughness is directly related to tillage, whose action strongly affects the key physical properties of ...
    • Evaluation of TOPLATS on three Mediterranean catchments 

      Loizu Maeztu, Javier Upna; Álvarez Mozos, Jesús Upna; Casalí Sarasíbar, Javier Upna; Goñi Garatea, Mikel Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      Physically based hydrological models are complex tools that provide a complete description of the different processes occurring on a catchment. The TOPMODEL-based Land-Atmosphere Transfer Scheme (TOPLATS) simulates water ...
    • Factors controlling sediment export in a small agricultural watershed in Navarre (Spain) 

      Giménez Díaz, Rafael Upna; Casalí Sarasíbar, Javier Upna; Grande Esteban, Ildefonso Upna; Díez Beregaña, Javier; Campo-Bescós, Miguel Upna; Álvarez-Mozos, Jesús Upna; Goñi Garatea, Mikel Upna (Elsevier, 2012)   Artículo / Artikulua  OpenAccess
      It is recognised that the hydrological and erosion processes in watersheds are very much conditioned by the (inter)action of a number of variables. This paper covers a 15-year period of studying those factors that have ...
    • Influence of surface roughness spatial variability and temporal dynamics on the retrieval of soil moisture from SAR observations 

      Álvarez Mozos, Jesús Upna; Verhoest, Niko E. C.; Larrañaga, Arantzazu Upna; Casalí Sarasíbar, Javier Upna; González Audicana, María Upna (MDPI, 2009)   Artículo / Artikulua  OpenAccess
      Radar-based surface soil moisture retrieval has been subject of intense research during the last decades. However, several difficulties hamper the operational estimation of soil moisture based on currently available ...
    • Multi-criteria evaluation of topographic correction methods 

      Sola Torralba, Ion Upna; González Audicana, María Upna; Álvarez Mozos, Jesús Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      In the last decades, several topographic correction methods (TOC) have been proposed, but there is not an agreement on the best method. Furthermore, different evaluation criteria have been used in the past, and there is ...
    • On the added value of quad-pol data in a multi-temporal crop classification framework based on RADARSAT-2 imagery 

      Larrañaga, Arantzazu Upna; Álvarez Mozos, Jesús Upna (MDPI, 2016)   Artículo / Artikulua  OpenAccess
      Polarimetric SAR images are a rich data source for crop mapping. However, quad-pol sensors have some limitations due to their complexity, increased data rate, and reduced coverage and revisit time. The main objective of ...
    • On the assimilation set-up of ASCAT soil moisture data for improving streamflow catchment simulation 

      Loizu Maeztu, Javier Upna; Massari, Christian; Álvarez Mozos, Jesús Upna; Tarpanelli, Angelica; Brocca, Luca; Casalí Sarasíbar, Javier Upna (Elsevier, 2018)   Artículo / Artikulua
      Assimilation of remotely sensed surface soil moisture (SSM) data into hydrological catchment models has been identified as a means to improve stream flow simulations, but reported results vary markedly depending on the ...
    • On the soil roughness parameterization problem in soil moisture retrieval of bare surfaces from synthetic aperture radar 

      Verhoest, Niko E. C.; Lievens, Hans; Wagner, Wolfgang; Álvarez Mozos, Jesús Upna; Moran, M. Susan; Mattia, Francesco (MDPI, 2008)   Artículo / Artikulua  OpenAccess
      Synthetic Aperture Radar has shown its large potential for retrieving soil moisture maps at regional scales. However, since the backscattered signal is determined by several surface characteristics, the retrieval of soil ...
    • Synthetic images for evaluating topographic correction algorithm 

      Sola Torralba, Ion Upna; González Audicana, María Upna; Álvarez Mozos, Jesús Upna; Torres Escribano, José Luis Upna (IEEE, 2013)   Artículo / Artikulua  OpenAccess
      In the last years, many topographic correction (TOC) methods have been proposed to correct the illumination differences between the areas observed by optical remote sensors. Although the available number of TOC methods is ...
    • Validation of a simplified model to generate multispectral synthetic images 

      Sola Torralba, Ion Upna; González Audicana, María Upna; Álvarez Mozos, Jesús Upna (MDPI, 2015)   Artículo / Artikulua  OpenAccess
      A new procedure to assess the quality of topographic correction (TOC) algorithms applied to remote sensing imagery was previously proposed by the authors. This procedure was based on a model that simulated synthetic scenes, ...