SANTAMARÍA-ARTIGAS, Andrès; MATTAR, Cristian; WIGNERON, Jean-Pierre; OLIVERA-GUERRA, Luis Enrique; DURAN-ALARCON, Claudio

doi:10.1109/IGARSS.2015.7326188

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SANTAMARÍA-ARTIGAS, Andrès
Universidad de Chile = University of Chile [Santiago] [UCHILE]

MATTAR, Cristian
Universidad de Chile = University of Chile [Santiago] [UCHILE]

WIGNERON, Jean-Pierre
Interactions Sol Plante Atmosphère [UMR ISPA]

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IEEE International Geoscience and Remote Sensing Symposium Proceedings, IEEE International Geoscience and Remote Sensing Symposium Proceedings, Geoscience and Remote Sensing Symposium (IGARSS), 2015 IEEE International, 2015-07-26, Milan. 2015

IEEE Geoscience and Remote Sensing Society

Résumé en anglais

Soil moisture is one of the biosphere's most essential climatic variables. However, its periodical monitoring at regional scales using in-situ measurements is complex. In this context, L-band microwaves observations from passive remote sensors appear as an important tool for the periodical estimation of soil moisture at regional scales. In this work, a semi-empirical model to estimate soil moisture values from L-band observation was calibrated and evaluated over several land cover classes in a heterogeneous study area in Chile. For this, 3 years (2010, 2011 and 2012) of brightness temperature data from SMOS, soil temperature and volumetric water content from ERA-Interim, and NDVI from MODIS were used. Results showed an increase in the average r2 when a vegetation index was used in the calibration of the approach. These increases ranged from a 3% for Crops, to a 49% for Closed Shrublands. The ubRMSD showed a decrease in its value of up to 1% m3/m3 for Woodlands, Open Shrublands and Woody Shrublands and of up to 2% m3/m3 for Closed Shrublands.< Réduire

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SMOS

calibration

soil moisture

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L-band

land surface

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Calibration and evaluation of an optical-passive microwave approach to estimate soil moisture over several land cover types

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