ECMWF – European Centre for Medium-Range Weather Forecasts

The ECMWF (European Centre for Medium-Range Weather Forecasts) is an international organization providing global numerical weather predictions and atmospheric reanalysis data. In geodesy, ECMWF products are widely used to model atmospheric effects on space-geodetic observations, such as tropospheric delays in GNSS and VLBI, atmospheric loading deformation, and mass redistribution within the atmosphere. These models are essential for improving the accuracy of positioning, reference frame realization, gravity field determination, and Earth system monitoring.

More info: https://www.ecmwf.int/