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Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region

Calibration and validation activities on Soil Moisture and Ocean Salinity (SMOS)-derived soil moisture products have been conducted worldwide since the data became available, but this has not been the case over tropical regions. This study focuses on the setting up of a soil moisture data collection...

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Main Authors:	Kang, C. S., Kanniah, K. D., Kerr, Y. H., Cracknell, A. P.
Format:	Article
Published:	2016
Subjects:	HD Industries. Land use. Labor HD1394-1394.5 Real estate management
Online Access:	http://eprints.utm.my/id/eprint/68823/ http://dx.doi.org/10.1080/01431161.2016.1201229
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id	my.utm.68823
record_format	eprints
spelling	my.utm.688232017-11-20T08:52:18Z http://eprints.utm.my/id/eprint/68823/ Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region Kang, C. S. Kanniah, K. D. Kerr, Y. H. Cracknell, A. P. HD Industries. Land use. Labor HD1394-1394.5 Real estate management Calibration and validation activities on Soil Moisture and Ocean Salinity (SMOS)-derived soil moisture products have been conducted worldwide since the data became available, but this has not been the case over tropical regions. This study focuses on the setting up of a soil moisture data collection network over an agricultural site in a tropical region in Peninsular Malaysia and on the validation of SMOS soil moisture products. The in-situ data over a one-and-a-half-year period was analysed and the validation of the SMOS soil moisture products with this in-situ data was conducted. Bias and root mean square error (RMSE) were computed between the SMOS soil moisture products and the in-situ surface soil moisture collected at the satellite passing times (6 am and 6 pm local time). Due to the known limitations of SMOS soil moisture retrieval over vegetated areas with a vegetation water content higher than 5 kg m−2, an overestimation of SMOS soil moisture products to in-situ data was noticed in this study. The bias ranged from 0.064 to 0.119 m3 m−3 and the RMSE was from 0.090 to 0.158 m3 m−3, when both ascending and descending mode data were measured. This RMSE was found to be similar to those of a number of studies conducted previously at different regions. However, a wet bias was found during the validation, while previous validation activities at other locations showed dry biases. The result of this study is useful to support the continuous development and improvement of the SMOS soil moisture retrieval model, aiming to produce soil moisture products with higher accuracy, especially in tropical regions. 2016 Article PeerReviewed Kang, C. S. and Kanniah, K. D. and Kerr, Y. H. and Cracknell, A. P. (2016) Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region. International Journal of Remote Sensing, 37 (16). pp. 3636-3654. http://dx.doi.org/10.1080/01431161.2016.1201229 DOI:10.1080/01431161.2016.1201229
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	HD Industries. Land use. Labor HD1394-1394.5 Real estate management
spellingShingle	HD Industries. Land use. Labor HD1394-1394.5 Real estate management Kang, C. S. Kanniah, K. D. Kerr, Y. H. Cracknell, A. P. Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region
description	Calibration and validation activities on Soil Moisture and Ocean Salinity (SMOS)-derived soil moisture products have been conducted worldwide since the data became available, but this has not been the case over tropical regions. This study focuses on the setting up of a soil moisture data collection network over an agricultural site in a tropical region in Peninsular Malaysia and on the validation of SMOS soil moisture products. The in-situ data over a one-and-a-half-year period was analysed and the validation of the SMOS soil moisture products with this in-situ data was conducted. Bias and root mean square error (RMSE) were computed between the SMOS soil moisture products and the in-situ surface soil moisture collected at the satellite passing times (6 am and 6 pm local time). Due to the known limitations of SMOS soil moisture retrieval over vegetated areas with a vegetation water content higher than 5 kg m−2, an overestimation of SMOS soil moisture products to in-situ data was noticed in this study. The bias ranged from 0.064 to 0.119 m3 m−3 and the RMSE was from 0.090 to 0.158 m3 m−3, when both ascending and descending mode data were measured. This RMSE was found to be similar to those of a number of studies conducted previously at different regions. However, a wet bias was found during the validation, while previous validation activities at other locations showed dry biases. The result of this study is useful to support the continuous development and improvement of the SMOS soil moisture retrieval model, aiming to produce soil moisture products with higher accuracy, especially in tropical regions.
format	Article
author	Kang, C. S. Kanniah, K. D. Kerr, Y. H. Cracknell, A. P.
author_facet	Kang, C. S. Kanniah, K. D. Kerr, Y. H. Cracknell, A. P.
author_sort	Kang, C. S.
title	Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region
title_short	Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region
title_full	Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region
title_fullStr	Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region
title_full_unstemmed	Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region
title_sort	analysis of in-situ soil moisture data and validation of smos soil moisture products at selected agricultural sites over a tropical region
publishDate	2016
url	http://eprints.utm.my/id/eprint/68823/ http://dx.doi.org/10.1080/01431161.2016.1201229
_version_	1643655976653422592
score	13.222552

Analysis of in-situ soil moisture data and validation of SMOS soil moisture products at selected agricultural sites over a tropical region

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