TY - JOUR
T1 - Estimation of root zone soil moisture using apparent thermal inertia with MODIS imagery over a tropical catchment in Northern Thailand
AU - Chang, Tzu Yin
AU - Wang, Yi Chen
AU - Feng, Chen Chieh
AU - Ziegler, Alan D.
AU - Giambelluca, Thomas W.
AU - Liou, Yuei An
N1 - Funding Information:
Manuscript received September 25, 2011; revised December 25, 2011; accepted February 20, 2012. Date of publication April 26, 2012; date of current version June 28, 2012. The work of T.-Y. Chang, Y.-C. Wang, and C.-C. Feng was supported by the National University of Singapore (NUS) grant R-109-000-070-101. The work of A. D. Ziegler and T. W. Giambelluca was supported by the NASA grant NNG04GH59G, the Asia Pacific Network grant ARCP2008-01CMY, and the NUS grant R-109-000-092-133.
PY - 2012
Y1 - 2012
N2 - Understanding the variability of soil moisture content (SMC) is important for studying ecohydrological processes because it provides insights into surface water and energy balances. To comprehend the dynamics of SMC under different land use/cover types in tropical environments, this study proposes an apparent thermal inertia (ATI) approach with the Moderate Resolution Imaging Spectroradiometer (MODIS) imagery for estimating root zone SMC. Root zone SMC at depths of 10 cm, 100 cm, and 200 cm were estimated for seven sites over a northern Thailand catchment from 2005 to 2008, and compared with in situ observations. Pearson correlation coefficient and the Nash-Sutcliffe efficiency coefficient between the ATI-MODIS retrieved SMC and the measurements were respectively 0.80, 0.84, and 0.84, and 0.57, 0.537, and 0.492 for the 10 cm, 100 cm, and 200 cm depths. Root Mean Square Errors were 0.055, 0.025 and 0.029 (m 3m -3) for the three respective depths. Potential issues of the mixed land cover types within the 1 km MODIS pixel were examined; the mixed agricultural land cover types at two of the seven sites with agricultural activities such as irrigation water use might have affected the SMC estimation. Overall, the ATI-MODIS approach performed well, particularly for the 100 cm depth.
AB - Understanding the variability of soil moisture content (SMC) is important for studying ecohydrological processes because it provides insights into surface water and energy balances. To comprehend the dynamics of SMC under different land use/cover types in tropical environments, this study proposes an apparent thermal inertia (ATI) approach with the Moderate Resolution Imaging Spectroradiometer (MODIS) imagery for estimating root zone SMC. Root zone SMC at depths of 10 cm, 100 cm, and 200 cm were estimated for seven sites over a northern Thailand catchment from 2005 to 2008, and compared with in situ observations. Pearson correlation coefficient and the Nash-Sutcliffe efficiency coefficient between the ATI-MODIS retrieved SMC and the measurements were respectively 0.80, 0.84, and 0.84, and 0.57, 0.537, and 0.492 for the 10 cm, 100 cm, and 200 cm depths. Root Mean Square Errors were 0.055, 0.025 and 0.029 (m 3m -3) for the three respective depths. Potential issues of the mixed land cover types within the 1 km MODIS pixel were examined; the mixed agricultural land cover types at two of the seven sites with agricultural activities such as irrigation water use might have affected the SMC estimation. Overall, the ATI-MODIS approach performed well, particularly for the 100 cm depth.
KW - MODIS
KW - soil moisture content
KW - thermal inertia
KW - tropical forest
UR - http://www.scopus.com/inward/record.url?scp=84863526585&partnerID=8YFLogxK
U2 - 10.1109/JSTARS.2012.2190588
DO - 10.1109/JSTARS.2012.2190588
M3 - 期刊論文
AN - SCOPUS:84863526585
SN - 1939-1404
VL - 5
SP - 752
EP - 761
JO - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
JF - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
IS - 3
M1 - 6189062
ER -
