Measurements of different thermal satellites are combined into a daily leaf temperature product from which evaporative cooling, sap-flow, and root zone soil moisture conditions are inferred using advanced remote sensing algorithms. The soil moisture from today - in conjunction with weather forecasts for tomorrow – will assess the need to irrigate during the next 24 hours. IrriWatch is the only company using the 4th generation SEBAL model as the core engine. Every field is divided into pixels of 100 m2 each. For each hectare (10,000 m2), 100 pixels will be consulted to decide on required irrigation actions for tomorrow. Irrigation is advised if 20 to 40 % of the pixels have soil moisture that is lower than the so-called critical soil moisture (i.e. threshold value at which crop water stress is triggered).