Calibration and evaluation of an optical-passive microwave approach to estimate soil moisture over several land cover types
Language
en
Communication dans un congrès
This item was published in
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
English Abstract
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 ...Read more >
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.Read less <
Keywords
SMOS
calibration
soil moisture
English Keywords
L-band
land surface
Origin
Hal imported