Publications des scientifiques de l'IRD

Peischl S., Walker J. P., Ye N., Ryu D., Kerr Yann. (2014). Sensitivity of multi-parameter soil moisture retrievals to incidence angle configuration. Remote Sensing of Environment, 143, p. 64-72. ISSN 0034-4257.

Titre du document
Sensitivity of multi-parameter soil moisture retrievals to incidence angle configuration
Année de publication
2014
Type de document
Article référencé dans le Web of Science WOS:000331859700006
Auteurs
Peischl S., Walker J. P., Ye N., Ryu D., Kerr Yann
Source
Remote Sensing of Environment, 2014, 143, p. 64-72 ISSN 0034-4257
This paper focuses on the sensitivity of L-band multi-parameter retrievals across the range of angular measurements available from the SMOS (Soil Moisture and Ocean Salinity) mission. The SMOS core algorithm was used to evaluate two-parameter retrieval scenarios including soil moisture and one of either i) vegetation water content, ii) surface roughness, iii) vegetation temperature, or iv) surface soil temperature. For all pairs a range of parameter value combinations were compiled to run the model in forward mode. Subsequently, the resulting angular brightness temperature simulations with two unknown parameters were compared against the brightness temperature response derived from reference simulations using data from the National Airborne Field Experiment 2005 (NAFE'05) in Australia. This paper showed that the two-parameter retrieval accuracy of soil moisture is strongly affected by the surface moisture conditions, the polarization of the brightness temperature data, and the choice of the secondary ancillary parameter to be retrieved. The synthetic analysis demonstrated a tendency for better retrievals from dual-polarized data at large incidence angles (40-50 degrees). Validation with airborne brightness temperature observations at L-band did not demonstrate such a strong angular dependency, although it confirmed that the simultaneous retrieval of soil moisture and vegetation properties is not preferable as opposed to i) soil moisture and surface roughness or ii) soil moisture and surface soil temperature, especially under dry moisture conditions.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Télédétection [126]
Identifiant IRD
PAR00011490
Contact