Para acceder a los documentos con el texto completo, por favor, siga el siguiente enlace: http://hdl.handle.net/2117/25115

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
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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 downscaling algorithm is presented as a new ability to obtain multiresolution soil moisture estimates from SMOS using visible-to-infrared remotely sensed observations. This algorithm is applied to combine 2 years of SMOS and MODIS Terra/Aqua data over the Iberian Peninsula into fine-scale (1 km) soil moisture estimates. Disaggregated soil moisture maps are compared to 0-5 cm ground-based measurements from the REMEDHUS network. Three matching strategies are employed: 1) a comparison at 40 km spatial resolution is undertaken to ensure SMOSsensitivity is preserved in the downscaled maps; 2) the spatio-temporal correlation of downscaled maps is analyzed through comparison with point-scale observations; and 3) high-resolution maps and ground-based observations are aggregated per land-use to identify spatial patterns related with vegetation activity and soil type. Results show that the downscaling method improves the spatial representation of SMOS coarse soil moisture estimates while maintaining temporal correlation and root mean squared differences with ground-based measurements. The dynamic range of in situ soil moisture measurements is reproduced in the high-resolution maps, including stations with different mean soil wetness conditions. Downscaled maps capture the soil moisture dynamics of general land uses, with the exception of irrigated crops. This evaluation study supports the use of this downscaling approach to enhance the spatial resolution of SMOS observations over semi-arid regions such as the Iberian Peninsula.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Satèl·lits i ràdioenllaços
Soil moisture--Measurement
Spectroscopic imaging
Dissagregation
downscaling
Moderate resolution Imaging Spectroradiometer (MODIS)
REMEDHUS
Soil Moisture and Ocean Salinity (SMOS)
soil moisture
Validation
Performance
Products
Imagery
Spain
NDVI
Sòls -- Humitat -- Mesurament
Espectroradiòmetres
info:eu-repo/semantics/publishedVersion
Artículo
         

Mostrar el registro completo del ítem

Documentos relacionados

Otros documentos del mismo autor/a

Pablos Hernández, Miriam; Piles Guillem, Maria; Sanchez, Nilda; Gonzalez Gambau, Verónica; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Martinez Fernandez, Jose
Sanchez, Nilda; Martinez Fernandez, Jose; Piles Guillem, Maria; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Aguasca Solé, Alberto
Sanchez, Nilda; Piles Guillem, Maria; Scaini, Anna; Martinez Fernandez, Jose; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena
Sanchez, Nilda; Alonso Arroyo, Alberto; Martinez Fernandez, Jose; Piles Guillem, Maria; Gonzalez Zamora, Angel; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena
Sanchez Ruiz, Sergio; Piles Guillem, Maria; Sanchez, Nilda; Martinez Fernandez, Jose; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José