Recently, the trend to be increase the intensity and frequency of water hazard has drawing great attention in connection with climate change. Global warming is driving frequent heavy rainfall and large amount of streamflow but we cannot detected them on ungaged drainage area. It is necessary to minimize flood and drought damage, and to reasonable method which is localized hydrological modelling and forecasting system using the satellites, radars and AWS(Automatic Weather System). The NASA GSFC (Goddard Space Flight Center) has producing land surface data for Global(GLDAS), Africa(FLDAS), America(NLDAS) and USA(NCA-LDAS) using the LIS(Land Information System). However Asia do not have standard to produce and provide them yet. Also the GLDAS is not represented each local scale effects.
To solve the problem, we attempted to develop localized system to produce the hydrologic parameter of Asia through technical cooperation joint research with NASA LIS core team. This article describes the retrieval and validation of hydrological parameters of South Korea where has a variety of available data such as in-situ, topographical data and meteorological data observed by AWS (Automatic Weather System), ASOS (Automated Synoptic Observing System), radars and satellites. These data were used to replace the MERRA2 that is input data of the LIS to apply local characteristics. Especially soil moisture and evapotranspiration are required to understand hydrological cycle, to induce streamflow through a hydrological model. Representatively, the two parameters of LIS hydrological data were evaluated via the retrieval accuracy with in-situ of South Korea and GLDAS based on remote sensing. The approach combined with the ASOS presented better accuracy than approach using the MERRA2. This result demonstrates the need for modelling with local detail. We will expand scope of research area through continuous acquire local input data in Asia. This project is able to be utilized to produce hydrological information of inaccessible or ungaged drainage area in Asia, and will contribute to scientific management of irrigation facilities, water resources and water hazard.