Comparative Analysis of Satellite-Based Evapotranspiration (ET) Products

Understanding the spatio-temporal variations in actual evapotranspiration (ETa) over irrigated agricultural areas is essential for effective water resource management. Remote sensing methods have been developed to estimate ETa, but selecting a suitable method remains challenging. Satellite-based (ETa) products offer a promising solution, but identifying an adequate product is difficult due to limited validation data. This study aims to evaluate the performance of different satellite-based (ETa) products, addressing the challenge of product selection and contributing to the prudent use of freshwater resources. This study conducts an evaluation and comparison of freely available satellite-based ET products. It presents a case study focused on a selected site in Sindh Pakistan, analyzing these products' spatial and temporal patterns, resolution, and accuracy. The goal was to identify the most suitable ET product for the study area. We have observed significant differences in ET values among the satellite-based products, highlighting the need for a comprehensive evaluation to select the most suitable product for the study area. This research highlights the importance of an in-depth validation of available satellite-derived (ETa) products. Such validation is crucial for making informed decisions in water resource management and assessing crop water productivity effectively within the region. Moreover, understanding these variations can significantly enhance irrigation practices and contribute to the sustainable management of water resources in agriculture.