Envíos recientes

  • Runoff, nutrients, sediment and salt yields in an irrigated watershed in southern Navarre (Spain) 

    Merchán Elena, Daniel Upna; Casalí Sarasíbar, Javier Upna; Valle de Lersundi, Jokin del; Campo Bescós, Miguel Ángel Upna; Giménez, Rafael; Preciado, Beatriz; Lafarga, Alberto (Elsevier, 2018)   Artículo / Artikulua
    The environmental impact of irrigated agriculture on water quality was assessed in Landazuria watershed (Navarre, northeast Spain), a 479.5 ha watershed with 53% of irrigated agricultural land. In the framework of a long-term ...
  • Ayer y hoy de la estela discoidea en Navarra 

    Ukar Muruzábal, Jesús Upna (Gobierno de Navarra. Institución Príncipe de Viana, 1994)   Artículo / Artikulua  OpenAccess
    El presente trabajo analiza y cataloga las estelas discoideales en Navarra.
  • Hallazgo de treintaiséis nuevas estelas de Navarra 

    Ukar Muruzábal, Jesús Upna (Gobierno de Navarra. Institución Príncipe de Viana, 1993)   Artículo / Artikulua  OpenAccess
    El presente estudio describe el hallazgo de 31 nuevas estelas de Navarra.
  • Tipología, tipometría y técnicas escultóricas utilizadas en las estelas de Navarra 

    Ukar Muruzábal, Jesús Upna (Gobierno de Navarra. Institución Príncipe de Viana, 1993)   Artículo / Artikulua  OpenAccess
    Este trabajo pretende diferenciar formalmente una serie de modelos de estelas discoideas, en base a la estructura del disco, del pie, del canto y de las relaciones entre ellos.
  • 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 ...
  • Residual stresses with time-independent cyclic plasticity in finite element analysis of welded joints 

    Lostado Lorza, Rubén; Corral Bobadilla, Marina; Martínez Calvo, María Ángeles; Villanueva Roldán, Pedro Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    Due to the intense concentration of heat in a reduced area when Gas Metal Arc Welding (GMAW) is used to join mechanical components, the regions near the weld bead are subjected to severe thermal cycles. Firstly, the region ...
  • 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 ...
  • 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, ...
  • 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, ...
  • Combined spatial and temporal effects of environmental controls on long-term monthly NDVI in the Southern Africa savanna 

    Campo Bescós, Miguel Ángel Upna; Muñoz Carpena, Rafael; Southworth, Jane; Zhu, Likai; Waylen, Peter; Bunting, Erin (MDPI, 2013)   Artículo / Artikulua  OpenAccess
    Deconstructing the drivers of large-scale vegetation change is critical to predicting and managing projected climate and land use changes that will affect regional vegetation cover in degraded or threated ecosystems. We ...
  • Project management in development cooperation. Non-governmental organizations 

    Montes Guerra, Maricela I.; Romero de Miguel, Aida; Pérez Ezcurdia, Amaya Upna; Gimena Ramos, Faustino Upna; Díez Silva, H. Mauricio (Universidad Nacional de Colombia, 2015)   Artículo / Artikulua  OpenAccess
    Este artículo analiza la adopción de prácticas propias de la gestión de proyectos en las ONG destinadas a la cooperación para el desarrollo, así como su influencia en la ejecución y el impacto de la aplicación de metodologías, ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Multi-criteria evaluation of topographic correction methods 

    Sola Torralba, Ion Upna; González Audicana, María Upna; Álvarez Mozos, Jesús Upna (Elsevier, 2016)   Artículo / Artikulua
    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 ...
  • 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 ...
  • 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 ...
  • 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 ...