Listar Artículos de revista DPIR - LIPS Aldizkari artikuluak por autor "Verhoest, Niko E. C."
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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 ; Baets, Bernard de (Copernicus Publications, 2011) Artículo / ArtikuluaSoil 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 ... -
Error in radar-derived soil moisture due to roughness parameterization: an analysis based on synthetical surface profiles
Lievens, Hans; Vernieuwe, Hilde; Álvarez-Mozos, Jesús ; Baets, Bernard de; Verhoest, Niko E. C. (MDPI, 2009) Artículo / ArtikuluaIn 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 ... -
Influence of surface roughness measurement scale on radar backscattering in different agricultural soils
Martínez de Aguirre Escobar, Alejandro ; Álvarez-Mozos, Jesús ; Lievens, Hans; Verhoest, Niko E. C. (IEEE, 2017) Artículo / ArtikuluaSoil surface roughness strongly affects the scattering of microwaves on the soil surface and determines the backscattering coefficient (σ 0 ) observed by radar sensors. Previous studies have shown important scale issues ... -
Influence of surface roughness sample size for C-band SAR backscatter applications on agricultural soils
Martínez de Aguirre Escobar, Alejandro ; Álvarez-Mozos, Jesús ; Lievens, Hans; Verhoest, Niko E. C.; Giménez Díaz, Rafael (IEEE, 2017) Artículo / ArtikuluaSoil surface roughness determines the backscatter coefficient observed by radar sensors. The objective of this letter was to determine the surface roughness sample size required in synthetic aperture radar applications and ... -
Influence of surface roughness spatial variability and temporal dynamics on the retrieval of soil moisture from SAR observations
Álvarez-Mozos, Jesús ; Verhoest, Niko E. C.; Larrañaga, Arantzazu ; Casalí Sarasíbar, Javier ; González de Audícana Amenábar, María (MDPI, 2009) Artículo / ArtikuluaRadar-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 ... -
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 ; Moran, M. Susan; Mattia, Francesco (MDPI, 2008) Artículo / ArtikuluaSynthetic 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 ...