Background
• Extended 1-D Kalman filter (EKF) has been
implemented into the catchment model and  was
validated using identical twin experiment in North
America by Jeff Walker
• Ensemble Kalman filter (EnKF) has been implemented
into the  catchchment model and was validated using
identical twin experiement in  North America by Rolf
Reichle
• Currently we are assimilating the soil moisture data
from SMMR into the the catchement model and
validate the above two data assimilation methods using
in-situ measurements in Eurasia and using the new
catchment definitions