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The collection covers data for the ERS-1, ERS-2 and Envisat missions, and is built upon a new processing of Level 0 data, incorporating numerous improvements in terms of algorithms, flagging procedures, and corrections.\r\rCompared to existing datasets, the Radiometry FDR demonstrates notable improvements in several aspects:\r\rNew solutions for instrumental effects (ERS Reflector loss, Skyhorn, and Sidelobe corrections)\rNative sampling rate of 7Hz with enhanced coverage\rThe FDR4ALT products are available in NetCDF format. Free standard tools for reading NetCDF data can be used.\rInformation for expert altimetry users is also available in a dedicated NetCDF group within the products.\rPlease consult the _$$FDR4ALT Product User Guide$$ https://earth.esa.int/eogateway/documents/d/earth-online/fdr4alt-products-user-guide before using the data.\rThe FDR4ALT datasets represent the new reference data for the ERS/Envisat altimetry missions, superseding any previous mission data. Users are strongly encouraged to make use of these datasets for optimal results.", "sci:citation": "European Space Agency, 2023, FDR4ALT Fundamental Data Records for Radiometry. 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