Estimating soil moisture at the watershed scale with satellite-based radar and land surface models
- 1 October 2004
- journal article
- Published by Taylor & Francis in Canadian Journal of Remote Sensing
- Vol. 30 (5), 805-826
- https://doi.org/10.5589/m04-043
Abstract
Spatially distributed soil moisture profiles are required for watershed applications such as drought and flood prediction, crop irrigation scheduling, pest management, and determining mobility with lightweight vehicles. Satellite-based soil moisture can be obtained from passive microwave, active microwave, and optical sensors, although the coarse spatial resolution of passive microwave and the inability to obtain vertically resolved information from optical sensors limit their usefulness for watershed-scale applications. Active microwave sensors such as synthetic aperture radar (SAR) currently represent the best approach for obtaining spatially distributed surface soil moisture at scales of 10–100 m for watersheds ranging from 1 000 to 25 000 km2. Although SAR provides surface soil moisture, the applications listed above require vertically resolved soil moisture profiles. To obtain distributed soil moisture profiles, a combined approach of calibration and data assimilation in soil vegetation atmosphere tr... Les profils d'humidité du sol spatialement distribués sont nécessaires dans le cadre des applications liées aux bassins versants telles que la prévision des sécheresses et des inondations, la planification des cédules d'irrigation des cultures, la gestion des infestations et la détermination de la mobilité des véhicules légers. L'humidité du sol peut être dérivée des données satellitaires au moyen des capteurs micro-ondes passifs, micro-ondes actifs et des capteurs optiques, bien que la résolution spatiale grossière des capteurs micro-ondes passifs et l'impossibilité d'obtenir une information intégrée verticalement avec les capteurs optiques limitent leur utilité pour les applications à l'échelle du bassin versant. Les capteurs micro-ondes actifs comme le radar à synthèse d'ouverture (RSO) représentent à l'heure actuelle la meilleure alternative pour l'obtention d'information sur l'humidité de surface qui est spatialement distribuée aux échelles de 10–100 m pour les bassins variant en superficie de 1 000 ...Keywords
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