Copernicus Global Land Service launches new global evapotranspiration product based on the WaPOR-ETLook model

In December 2025, the Copernicus Global Land Monitoring Service (CLMS) released a new global evapotranspiration (ET) product at 300 meter resolution, incorporating the WaPOR-ETLook model as one of its core methodologies. The product is the result of a long-term collaboration between the Copernicus programme and  the Water Productivity through Open access of Remotely sensed derived data (WaPOR) project, implemented by the Food and Agriculture Organization of the United Nations (FAO). 

The WaPOR team welcomes the integration of the WaPOR-ETLook methodology into the CLMS global suite of products and looks forward to further exploring how the CLMS offering complements existing WaPOR capabilities. This will enable the team to better support users who work across both platforms, helping them leverage the strengths of each product for different scales and applications.

The CLMS evapotranspiration product is based on two scientifically validated approaches: the WaPOR-ETLook model, developed by FAO to produce WaPOR ET data, as well as the Sen-ET framework using the Two-Source Energy Balance - Priestley-Taylor (TSEB-PT) model. In addition to providing one dataset for each approach, the CLMS also offers an ensemble product by combining outputs from both models.

The new ET product is available at 300 m resolution globally, in 10-day (dekadal) composites, with near-real-time delivery within two days after each dekad. In addition to the total evapotranspiration, the CLMS also offers the breakdown into its main components soil evaporation (E) and the canopy transpiration (T). 

The WaPOR-ETLook model contributes essential capabilities to this global product through its two-source energy balance approach that separates evaporation from soil and transpiration from canopy, its land surface temperature-vegetation cover trapezoid method for deriving root-zone and top-soil moisture, and its approach to adjusting ET estimates based on available soil moisture. 

The release of this new global ET product broadens access to essential water monitoring capabilities, a core goal of the WaPOR portal and project. It thereby supports applications ranging from regional water accounting, to national drought monitoring systems, and international climate change assessments.