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Remote Sens. 2015, 7(11), 15729-15747; doi:10.3390/rs71115729

Evaluation of Satellite and Reanalysis Soil Moisture Products over Southwest China Using Ground-Based Measurements

1
Max Planck Institute for Meteorology, 20146 Hamburg, Germany
2
Department of Geography, University of Munich (LMU), 80333 Munich, Germany
3
College of Urban and Environmental Sciences, Northwest University, Xi’an 710027, China
4
Yunnan Institute of Water Resources and Hydropower Research, Kunming 650228, China
*
Author to whom correspondence should be addressed.
Academic Editors: Nicolas Baghdadi and Prasad S. Thenkabail
Received: 28 September 2015 / Revised: 16 November 2015 / Accepted: 18 November 2015 / Published: 23 November 2015
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Abstract

Long-term global satellite and reanalysis soil moisture products have been available for several years. In this study, in situ soil moisture measurements from 2008 to 2012 over Southwest China are used to evaluate the accuracy of four satellite-based products and one reanalysis soil moisture product. These products are the Advanced Microwave Scanning Radiometer for the Earth observing system (AMSR-E), the Advanced Scatterometer (ASCAT), the Soil Moisture and Ocean Salinity (SMOS), the European Space Agency’s Climate Change Initiative soil moisture (CCI SM), and the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Reanalysis (ERA-Interim). The evaluation of soil moisture absolute values and anomalies shows that all the products can capture the temporal dynamics of in situ soil moisture well. For AMSR-E and SMOS, larger errors occur, which are likely due to the severe effects of radio frequency interference (RFI) over the test region. In general, the ERA-Interim (R = 0.782, ubRMSD = 0.035 m3/m3) and CCI SM (R = 0.723, ubRMSD = 0.046 m3/m3) perform the best compared to the other products. The accuracy levels obtained are comparable to validation results from other regions. Therefore, local hydrological applications and water resource management will benefit from the long-term ERA-Interim and CCI SM soil moisture products. View Full-Text
Keywords: validation; in situ soil moisture; satellite-based soil moisture; reanalysis soil moisture; Southwest China validation; in situ soil moisture; satellite-based soil moisture; reanalysis soil moisture; Southwest China
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Peng, J.; Niesel, J.; Loew, A.; Zhang, S.; Wang, J. Evaluation of Satellite and Reanalysis Soil Moisture Products over Southwest China Using Ground-Based Measurements. Remote Sens. 2015, 7, 15729-15747.

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