Rainfall is one of the most important input data of hydrologic models. Rain gage is used to estimate
areal rainfall for hydrologic models using several interpolation method such as Thiessen polygon, Inverse Distance
Squared(IDS) and Kriging. However, it is still difficult to derive actual spatial distribution of the rainfall using the
aforementioned approaches. On the other hand, radar can offer a significant analytic improvement for rainfall
analysis by providing directly more representative of the true spatial distribution of rainfall. In this study, In this
study, spatial distributions of rainfall derived form rain gages using IDS and Kriging and rainfall from radar are
compared. As results, it is found that using radar can provide actual spatial distribution than rain gages.
Keywords : Inverse Distance Squared, Kriging, Radar, Spatial distribution