Fundamental Data Records for Altimetry [ALT_FDR___] EARTH SCIENCE>ATMOSPHERE EARTH SCIENCE>OCEANS EARTH SCIENCE>OCEANS>BATHYMETRY/SEAFLOOR TOPOGRAPHY EARTH SCIENCE>OCEANS>MARINE GEOPHYSICS EARTH SCIENCE>OCEANS>OCEAN CIRCULATION EARTH SCIENCE>OCEANS>OCEAN WAVES EARTH SCIENCE>OCEANS>SEA SURFACE TOPOGRAPHY EARTH SCIENCE>CRYOSPHERE EARTH SCIENCE>CRYOSPHERE>SNOW/ICE ERS-1 ERS-2 ENVISAT RA MWR RA-2 Atmosphere Oceans Bathymetry and Seafloor Topography Marine Geophysics Ocean Circulation Ocean Waves Sea Surface Topography Cryosphere Snow and Ice Sun-synchronous 800 km 5 - 1150 km Radar Altimeters Imaging Spectrometers/Radiometers ERS-1 ERS-2 Envisat RA MWR RA-2 DIF10 This dataset is a Fundamental Data Record (FDR) resulting from the _$$ESA FDR4ALT project$$ https://www.fdr4alt.org/ . The Fundamental Data Record for Altimetry V1 products contain Level 0 and Level 1 altimeter-related parameters including calibrated radar waveforms and supplementary instrumental parameters describing the altimeter operating status and configuration through the satellite lifetime. The data record consists of data for the ERS-1, ERS-2 and Envisat missions for the period ranging from 1991 to 2012, and bases on the Level 1 data obtained from previous ERS REAPER and ENVISAT V3.0 reprocessing efforts incorporating new algorithms, flags, and corrections to enhance the accuracy and reliability of the data. For many aspects, the Altimetry FDR product has improved compared to the existing individual mission datasets: New neural-network waveform classification, surface type classification, distance to shoreline and surface flag based on GSHHG Instrumental calibration information directly available in the product Improved Orbit solutions Correction of REAPER drawbacks (i.e., time jumps and negative waveforms) The FDR4ALT products are available in NetCDF format. Free standard tools for reading NetCDF data can be used. Information for expert altimetry users is also available in a dedicated NetCDF group within the products. Please consult the _$$FDR4ALT Product User Guide$$ https://earth.esa.int/eogateway/documents/d/earth-online/fdr4alt-products-user-guide before using the data. The 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. 2024-04-22T00:00:00.00Z series FDRforAltimetry eng -90.0 -180.0 90.0 -180.0 90.0 180.0 -90.0 180.0 -90.0 -180.0 Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions. https://earth.esa.int/eogateway/documents/20142/1564626/Terms-and-Conditions-for-the-use-of-ESA-Data.pdf