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Journal Article

Evaluating Bias-Corrected AMSR-E Soil Moisture using in situ Observations and Model Estimates

V. Sridhar, W.T.A. Jaksa, Bin Fang, Venkat Lakshmi, Kenneth G. Hubbard, Xin Jin
Published: 01 August 2013
Vadose Zone Journal (2013) 12 (3): vzj2013.05.0093.
DOI: https://doi.org/10.2136/vzj2013.05.0093
...V. Sridhar; W.T.A. Jaksa; Bin Fang; Venkat Lakshmi; Kenneth G. Hubbard; Xin Jin Abstract Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E) soil moisture data products are proven to be useful across various regions around the world. However, numerous studies have suggested...
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View PDF for article title, Evaluating Bias-Corrected <span class="search-highlight">AMSR</span>-<span class="search-highlight">E</span> Soil Moisture using in situ Observations and Model Estimates
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(a) Average AMSR-E, observed, modeled, and scaled AMSR-E based on model and observed data for eight sites (based on 4 yr of data between 2002 and 05 in m3 m−3). Figure shows higher volumetric soil moisture in the eastern sites (YORK, BEAT, REDC, and INDI) and during the growing season (AMJ and JAS) in all sites. (b) Computed RMSE between AMSR-E and Observed, Model and Observed, Scaled (M) and Observed and Scaled (O), and observed for eight sites during 2002–2005. (c) Computed mean percentile error (MPE) for eight sites during 2002–2005. (d) Computed mean absolute error (MAE) for eight sites during 2002–2005.

(a) Average AMSR-E, observed, modeled, and scaled AMSR-E based on model and...

Published: 01 August 2013
Fig. 4. (a) Average AMSR-E, observed, modeled, and scaled AMSR-E based on model and observed data for eight sites (based on 4 yr of data between 2002 and 05 in m 3 m −3 ). Figure shows higher volumetric soil moisture in the eastern sites (YORK, BEAT, REDC, and INDI) and during the growing season
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Overall scatter plots of spatial standard deviation of NLDAS, AMSR-E, and 1-km soil moisture versus the Oklahoma Mesonet and Little Washita Micronet soil moisture observations for all the months.

Overall scatter plots of spatial standard deviation of NLDAS, AMSR-E, and 1...

Published: 01 August 2013
Fig. 10. Overall scatter plots of spatial standard deviation of NLDAS, AMSR-E, and 1-km soil moisture versus the Oklahoma Mesonet and Little Washita Micronet soil moisture observations for all the months.
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Comparison of the estimated soil moisture, AMSR-E and NARR soil moisture data with in situ observations for the Scotty Creek area.

Comparison of the estimated soil moisture, AMSR-E and NARR soil moisture da...

Published: 01 August 2013
Fig. 7. Comparison of the estimated soil moisture, AMSR-E and NARR soil moisture data with in situ observations for the Scotty Creek area.
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Temporal patterns of AMSR-E soil moisture, observed soil moisture data (m3 m−3) and precipitation for eight sites during 2002–2005.

Temporal patterns of AMSR-E soil moisture, observed soil moisture data (m 3...

Published: 01 August 2013
Fig. 3. Temporal patterns of AMSR-E soil moisture, observed soil moisture data (m 3 m −3 ) and precipitation for eight sites during 2002–2005.
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RMSE and R 2 statistics for AMSR-E and in situ soil moisture observation...

Published: 01 August 2013
Table 2. RMSE and R 2 statistics for AMSR-E and in situ soil moisture observations, along with the deviation between interpolated observed vs. AMSR-E, Scaled (M), and Scaled (O) soil moisture. R 2 RMSE Unbiased RMSE Bias Number of points 2003 0.15 0.12 0.11 −0.08 48
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Comparisons of spatial soil moisture pattern between bias-corrected AMSR-E and Variable Infiltration Capacity model (VIC) estimates in June 2004 in southwestern Idaho.

Comparisons of spatial soil moisture pattern between bias-corrected AMSR-E ...

Published: 01 August 2013
Fig. 8. Comparisons of spatial soil moisture pattern between bias-corrected AMSR-E and Variable Infiltration Capacity model (VIC) estimates in June 2004 in southwestern Idaho.
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Comparison of the estimated soil moisture and the AMSR-E soil moisture data with NARR soil moisture for (a) the PAD and (b) the Scotty Creek areas.

Comparison of the estimated soil moisture and the AMSR-E soil moisture data...

Published: 01 August 2013
Fig. 6. Comparison of the estimated soil moisture and the AMSR-E soil moisture data with NARR soil moisture for (a) the PAD and (b) the Scotty Creek areas.
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Maps of the NLDAS, AMSR-E, and 1-km soil moisture (m3 m−3) from May 22, 2004, July 17, 2005 and August 9, 2005 in Oklahoma.

Maps of the NLDAS, AMSR-E, and 1-km soil moisture (m 3 m −3 ) from May 22,...

Published: 01 August 2013
Fig. 6. Maps of the NLDAS, AMSR-E, and 1-km soil moisture (m 3 m −3 ) from May 22, 2004, July 17, 2005 and August 9, 2005 in Oklahoma.
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Maps of the NLDAS, AMSR-E, and 1-km soil moisture (m3 m−3) from 22 May 2004, 17 July 2005, and 2 August 2005 in Little Washita.

Maps of the NLDAS, AMSR-E, and 1-km soil moisture (m 3 m −3 ) from 22 May ...

Published: 01 August 2013
Fig. 7. Maps of the NLDAS, AMSR-E, and 1-km soil moisture (m 3 m −3 ) from 22 May 2004, 17 July 2005, and 2 August 2005 in Little Washita.
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(a) Overall scatter plots of NLDAS, AMSR-E, and 1-km soil moisture versus the Little Washita Micronet soil moisture observations for all the months. (b) Overall scatter plots of NLDAS, AMSR-E, and 1-km detrended soil moisture versus the Little Washita Micronet soil moisture observations for all the months.

(a) Overall scatter plots of NLDAS, AMSR-E, and 1-km soil moisture versus t...

Published: 01 August 2013
Fig. 9. (a) Overall scatter plots of NLDAS, AMSR-E, and 1-km soil moisture versus the Little Washita Micronet soil moisture observations for all the months. (b) Overall scatter plots of NLDAS, AMSR-E, and 1-km detrended soil moisture versus the Little Washita Micronet soil moisture observations
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(a) The time series of raw AMSR-E soil moisture, observed soil moisture and scaled soil moisture using model and observed data (m3 m−3) from June 2002 to December 2005 for INDI site. (b) Comparison of normalized anomaly between raw and scaled soil moisture computed from model estimated and observed soil moisture for MITC station.

(a) The time series of raw AMSR-E soil moisture, observed soil moisture and...

Published: 01 August 2013
Fig. 5. (a) The time series of raw AMSR-E soil moisture, observed soil moisture and scaled soil moisture using model and observed data (m 3 m −3 ) from June 2002 to December 2005 for INDI site. (b) Comparison of normalized anomaly between raw and scaled soil moisture computed from model
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The relationship between interpolated Observed (Obs) data, AMSR-E, Scaled (M), and Scaled (O) in (top) 2003, (middle) 2004, and (bottom) 2005 for Nebraska (m3 m−3). The spline regularized interpolation function was used to interpolated 37 sites dataset into raster surface. The averages of 34 by 12 pixels were used for statistical analysis and graphical representation.

The relationship between interpolated Observed (Obs) data, AMSR-E, Scaled (...

Published: 01 August 2013
Fig. 7. The relationship between interpolated Observed (Obs) data, AMSR-E, Scaled (M), and Scaled (O) in (top) 2003, (middle) 2004, and (bottom) 2005 for Nebraska (m 3 m −3 ). The spline regularized interpolation function was used to interpolated 37 sites dataset into raster surface
Journal Article

Passive Microwave Soil Moisture Downscaling Using Vegetation Index and Skin Surface Temperature

Bin Fang, Venkat Lakshmi, Rajat Bindlish, Thomas J. Jackson, Michael Cosh, Jeffrey Basara
Published: 01 August 2013
Vadose Zone Journal (2013) 12 (3): vzj2013.05.0089.
DOI: https://doi.org/10.2136/vzj2013.05.0089
...Fig. 10. Overall scatter plots of spatial standard deviation of NLDAS, AMSR-E, and 1-km soil moisture versus the Oklahoma Mesonet and Little Washita Micronet soil moisture observations for all the months. ...
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View PDF for article title, Passive Microwave Soil Moisture Downscaling Using Vegetation Index and Skin Surface Temperature
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Journal Article

Multi-Stage Inversion Method to Retrieve Soil Moisture from Passive Microwave Measurements over the Mackenzie River Basin

Naira Chaouch, Robert Leconte, Ramata Magagi, Marouane Temimi, Reza Khanbilvardi
Published: 01 August 2013
Vadose Zone Journal (2013) 12 (3): vzj2012.0134.
DOI: https://doi.org/10.2136/vzj2012.0134
...Fig. 7. Comparison of the estimated soil moisture, AMSR-E and NARR soil moisture data with in situ observations for the Scotty Creek area. ...
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View PDF for article title, Multi-Stage Inversion Method to Retrieve Soil Moisture from Passive Microwave Measurements over the Mackenzie River Basin
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Journal Article

Global Automated Quality Control of In Situ Soil Moisture Data from the International Soil Moisture Network

W.A. Dorigo, A. Xaver, M. Vreugdenhil, A. Gruber, A. Hegyiová, A.D. Sanchis-Dufau, D. Zamojski, C. Cordes, W. Wagner, M. Drusch
Published: 01 August 2013
Vadose Zone Journal (2013) 12 (3): vzj2012.0097.
DOI: https://doi.org/10.2136/vzj2012.0097
.... A validation example of an AMSR-E satellite and a GLDAS-Noah model product showed a small but positive impact of the flagging. On the basis of the positive results of this study we will add the flags as a standard attribute to all soil moisture measurements contained in the ISMN. The International Soil...
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View PDF for article title, Global Automated Quality Control of In Situ Soil Moisture Data from the International Soil Moisture Network
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Non-bias-corrected (NBC), bias-corrected (BC) based cumulative distribution function (CDF) of AMSR-E in comparison with Noah land surface model.

Non-bias-corrected (NBC), bias-corrected (BC) based cumulative distribution...

Published: 01 August 2013
Fig. 2. Non-bias-corrected (NBC), bias-corrected (BC) based cumulative distribution function (CDF) of AMSR-E in comparison with Noah land surface model.
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Weekly moving average values of Advanced Microwave Scanning Radiometer-EOS (AMSR-E) soil moisture at four selected meteorological stations from 2003 to 2011 (inset for 2010).

Weekly moving average values of Advanced Microwave Scanning Radiometer-EOS ...

Published: 01 October 2016
Fig. 15. Weekly moving average values of Advanced Microwave Scanning Radiometer-EOS (AMSR-E) soil moisture at four selected meteorological stations from 2003 to 2011 (inset for 2010).
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Study areas: (a) the Brown (BRW) site in Illinois, (b) the Walnut Creek (WC 11–14) sites in Iowa based on Polarimetric Scanning Radiometer (PSR) and Moderate Resolution Imaging Spectroradiometer (MODIS), and (c) the Lubbock site in Texas based on Advanced Microwave Scanning Radiometer–Earth Observing System (AMSR-E) and MODIS.

Study areas: (a) the Brown (BRW) site in Illinois, (b) the Walnut Creek (WC...

Published: 01 August 2013
–Earth Observing System (AMSR-E) and MODIS.
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Maps of variables used in the soil moisture downscaling algorithm from 21 July 2005 over Oklahoma, MODIS Aqua 1-km land surface temperature (a) during the day and (b) at night; (c) 1/4° spatial resolution AMSR-E soil moisture; (d) 1/8° spatial resolution NLDAS soil moisture; (e) MODIS Aqua 1-km NDVI.

Maps of variables used in the soil moisture downscaling algorithm from 21 J...

Published: 01 November 2013
Fig. 2. Maps of variables used in the soil moisture downscaling algorithm from 21 July 2005 over Oklahoma, MODIS Aqua 1-km land surface temperature (a) during the day and (b) at night; (c) 1/4° spatial resolution AMSR-E soil moisture; (d) 1/8° spatial resolution NLDAS soil moisture; (e) MODIS