Drought periods are increasing their frequency as consequence of climate change and the agricultural sector is one of the most affected due to the water demand and growing request of agricultural commodities. Thus, water management for a sustainable agriculture is becoming challenging. In this context, the need to estimate soil evapotranspiration (ET) arises because it is critical for crop water stress assessment as well as hydrological modelling, irrigation scheduling, water management and weather forecasting. Since an accurate estimation of ET is difficult to reach across different spatial and temporal scales, a satellite-based product for this type of analysis proves to be very useful.