*Proceeding Paper*

### **Estimation of Remotely Sensed Actual Evapotranspiration in Water-Limited Mediterranean Agroecosystems for Monitoring Crop (cotton) Water Requirements †**

**Marios Spiliotopoulos 1,\* , Nicolas Alpanakis 1, Georgios A. Tziatzios 1 , Ioannis Faraslis 2 , Pantelis Sidiropoulos 1 , Stavros Sakellariou 2, George Karoutsos 3, Nicolas R. Dalezios 1 and Nicholas Dercas 4**


† Presented at the 7th International Electronic Conference on Water Sciences, 15–30 March 2023; Available online: https://ecws-7.sciforum.net.

**Abstract:** The role of effective irrigation managemen<sup>t</sup> for optimal food production is well recognized and can be partially solved through the improvement of water use efficiency (WUE). To control the quantity of the water applied to actual crops, net irrigation water requirements (NIWR) are needed. The computation of NIWR is based on the estimation of crop water requirements (CWR) and soil water balance, where crop evapotranspiration (ETc) is the main component. Earth observation (EO) using remote sensing (RS) has already become an important tool for the quantification and the detection of spatial and temporal distributions and variability in several environmental variables at different scales. Remotely sensed models are currently considered to be suitable for crop water use estimation in the field and at regional scales.

**Keywords:** ET; crop water requirements; sentinel imagery; cotton
