{ "extent": { "spatial": {"bbox": [[ -180, -90, 180, 90 ]]}, "temporal": {"interval": [[ "2008-04-01T00:00:00.000Z", "2008-04-30T23:59:59.999Z" ]]} }, "stac_version": "1.0.0", "sci:doi": "10.5270/esa-2d07033", "keywords": [ "DIF10", "EARTH SCIENCE>ATMOSPHERE", "ERS-1", "ERS-2", "ENVISAT", "RA", "MWR", "RA-2", "Atmosphere", "Sun-synchronous", "800 km", "5 - 1150 km", "Radar Altimeters", "Imaging Spectrometers/Radiometers", "Envisat" ], "created": "2024-04-22T00:00:00.00Z", "description": "This is the Atmospheric Thematic Data Product (TDP) V1 resulting from the _$$ESA FDR4ALT project$$ https://www.fdr4alt.org/ and containing Total Column Water Vapour (TCWV), Cloud Liquid Water Path (LWP), Atmospheric Attenuation of the altimeter backscattering coefficient at Ku-band (AttKu), and Wet Tropospheric Correction (WTC), retrieved from observations of the Microwave Radiometer (MWR) instruments flown on-board the ERS-1, and ERS-2, and Envisat satellites.\r\rCompared to existing datasets, the Atmospheric TDP demonstrates notable improvements in several aspects:\r\rImproved temporal coverage, especially for ERS-2\rImproved L0 -> 1 processing\rTwo different corrections are provided based on a neural network retrieval or on a 1D-VAR approach\r\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 Atmospheric Thematic Data Product. 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