—Soil moisture is a key component of the hydrology
meteorology, climatology, and agriculture management in
terms of interaction between land surface and atmosphere.
Understanding energy and water cycles processes is needed to
accurately monitor spatial and temporal variability of soil
moisture. In this study, we conducted validation study of active
microwave satellite soil moisture data by comparing and
evaluating with in-situ soil moisture measured from South
Korea and Brazil. The satellite data are derived from the
advanced Scatterometer (ASCAT) on board the Metop (VV
polarization C-band to 5.255 GHz) satellite, called as Soil Water
Index (SWI). We will focus on growing season from May
through September in 2012, to avoid any effect on soil moisture
data quality due to the severe wintry weather. The comparison
results of this validation task were expressed in three statistical
values: Correlation coefficient (R), Bias and Root Mean Square
Error (RMSE). The results showed that the ASCAT SWI
products have reliable agreements with ground measurements
in Korea and Brazil.
—ASCAT, remotely sensed soil moisture, in situ
soil moisture, soil water index.
Eunsang Cho is with Department of Civil and Environmental Engineering,
Hanyang University, Seoul 133-791, Republic of Korea (e-mail:
Gabriel Alves Vasconcelos is with the Department of Civil Engineering,
University of Brasília, Distrito Federal, Brazil (e-mail:
Minha Choi is with Water Resources and Remote Sensing Laboratory,
School of Civil, Architectural, and Environmental Engineering,
Cite: Eunsang Cho, Gabriel Alves Vasconcelos, and Minha Choi, "Validation Study of Active Microwave Soil Moisture
Products in Korea and Brazil," International Journal of Engineering and Technology vol. 7, no. 3, pp. 219-222, 2015.