{"ob_id":39524,"computationComponent":[{"ob_id":39525,"uuid":"28a24e2f4a1e4b50962b3378afabc980","title":"Computation Component: Level 2 Land processing algorithm applied to Sentinel 3 SRAL raw data.","abstract":"There are three main steps in the Level-2 processing chain:\r\n\r\n1. Compute time-derived geophysical/environmental parameters.\r\n2. Perform re-tracking and compute physical parameters.\r\n3. Compute Level-2 altimeter/radiometer geophysical processing. \r\n\r\nComputing time-derived geophysical parameters involves:\r\n\r\n* re-computing altitude, orbital altitude rate, location and Doppler correction, accounting for updated orbit data\r\n* computing ionospheric corrections\r\n*computing non-equilibrium and equilibrium ocean tide heights, tidal loading, solid earth tide height, equilibrium long period ocean tide height and pole tide height (using pole locations)\r\n*computing the height of the mean sea surface above the reference ellipsoid\r\n*computing the mean dynamic topography, the height of the geoid and the ocean depth/land elevation.\r\n\r\nPerforming retracking and computing physical parameters (both SAR and LRM modes) involves:\r\n\r\n*discriminating echoes (ocean/lead, sea-ice, ice sheet margin or ocean/coastal)\r\n*performing retracking (ocean/lead, sea-ice, ice sheet margin or ocean/coastal)\r\n*computing physical parameters\r\n*merging snow depth (ocean/lead and sea-ice only)\r\n*performing a short-arc, along track ocean interpolation (ocean/lead and sea-ice only)\r\n*estimating freeboards (ocean/lead and sea-ice only)\r\n*performing a latitude limit check (ocean/lead and sea-ice only)\r\n\r\n(For SAR mode) performing modified slope correction (ice sheet margin and ocean/coastal only).\r\nLevel-2 altimeter/radiometer geophysical processing involves:\r\n\r\n*inputting and checking Level-1 MWR products\r\n*computing and correcting physical parameters according to platform data\r\n*interpolating MWR data and computing MWR geophysical parameters\r\n*computing altimeter wind speed and rain/ice flags\r\n*computing wind, tropospheric corrections and inverted barometer according to meteorological data\r\n*computing HF fluctuations of the atmospheric effect on the surface (dynamic atmosphere correction)\r\n*computing sea state bias\r\n*computing dual frequency ionospheric corrections\r\n*building and checking Level-2 SRAL/MWR products.","keywords":"","inputDescription":null,"outputDescription":null,"softwareReference":null,"identifier_set":[]}],"acquisitionComponent":[{"ob_id":19015,"independentInstrument":[],"instrumentplatformpair_set":[{"ob_id":10047,"platform":"https://catalogue.ceda.ac.uk/api/v2/platforms/19017/?format=json","instrument":"https://catalogue.ceda.ac.uk/api/v2/instruments/19016/?format=json","relatedTo":{"ob_id":19015,"uuid":"1c1605795ae247c28a64d003c686bdb2","short_code":"acq"}}]}],"identifier_set":[],"responsiblepartyinfo_set":["https://catalogue.ceda.ac.uk/api/v2/rpis/192734/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/192736/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/192735/?format=json"]}