ESTIMATION OF EVAPOTRANSPIRATION USING METRIC MODEL WITH HIGH RESOLUTION SATELLITE IMAGERY IN KOREA

One of the most significant elements of the hydrological cycle is evapotranspiration (ET) as it is a functional part of meteorological conditions. The Visualization of Evapotranspiration at high definition with integrated calibrated (METRIC) model is an example of an image-processing tool that involves the utilization of satellite data in order to compute evapotranspiration as a residual to surface energy equilibrium. Therefore, we used the METRIC model to enumerate ET using 30 m high spatial resolution from Landsat 9 scenes for a study period of 2024 over Cheongmicheon flux tower (CFK) site in Korean peninsula. The METRIC estimations were compared with flux tower measurements obtained from a warm continental climate CFK site for the accuracy assessment. The estimated and measured actual evapotranspiration (AET) at daily scale had good agreement with strong coefficient of determination 0.97. In addition, the trend of ET in comparison to the air temperature was also comparable. This evaluation seeks to enhance the understanding of the strength of the model for mapping the energy balance at the regional scale. Additionally, it is a step towards developing a methodology that can be applied to a wide variety of ecosystems that are heterogeneous.