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European Space Agency (ESA)

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Roles

 AATSR Multimission land and sea surface data, version 2.1
 Emission Spectra Data and Derived Products from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on-board the European Space Agency (ESA) Envisat Satellite
 SCIAMACHY: Global Radiance and Vertical Columns of Trace Gases Data
 AATSR Multimission land and sea surface data, version 2.0
 ESA Synthetic Aperture Radar (SAR) and Advanced-SAR (ASAR) radar backscatter measurements
 World Land Surface Temperature Atlas (WLSTA) for 1992-1993
 Measurement of H2O Absorption Cross-Sections funded by the European Space Agency (ESA)
 Sentinel 2A: High-resolution optical imaging data from the Multispectral Instrument (MSI)
 MEdium Resolution Imaging Spectrometer (MERIS) on-board the European Space Agency (ESA) Envisat Satellite: Global Radiances, Sea Colour, Ocean Chlorophyll Content, Sediment and Cloud Parameters
 Sentinel 1A: C-band Synthetic Aperture Radar (SAR) data
 AATSR Multimission land and sea surface data, version 3
 ATSR-1 Multimission land and sea surface data, version 2.1
 AATSR Multimission land and sea surface data, version 1.1
 ATSR-1 Multimission land and sea surface data, version 3
 ATSR-1 Multimission land and sea surface data, version 1.1
 ATSR-2 Multimission land and sea surface product, version 2.1
 ATSR-2 Multimission land and sea surface data, version 3
 ATSR-2 Multimission land and sea surface data, version 1.1
 ATSR-1 Multimission land and sea surface data, version 2.0
 ATSR-2 Multimission land and sea surface data, version 2.0
 Sentinel 1B: C-band Synthetic Aperture Radar (SAR) data
 Sentinel 3A: Sea and Land Surface Temperature Radiometer (SLSTR) data
 Sentinel 2B: High-resolution optical imaging data from the Multispectral Instrument (MSI)
 Sentinel 5 Precursor: Level 2 data
 Solar and Heliospheric Observatory (SOHO) Project Data
 Sentinel 3B Synthetic Aperture Radar Altimeter (SRAL) Level 1B data
 Sentinel 2A Multispectral Instrument (MSI) Level 1C data
 Sentinel 3A Ocean and Land Colour Instrument (OLCI) Ocean Colour Reduced Resolution (ERR) data
 Sentinel 3A Synthetic Aperture Radar Altimeter (SRAL) Level 2 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): SM mode SLC Level 1 data
 Sentinel 5P: Suomi-NPP VIIRS Clouds level 2 data
 WLSTA: Climatic Land Surface Temperatures over a month and a square half degree grid.
 L1b AVHRR-3 Radiometric imager data onboard MetOp-B
 European Remote Sensing Satellite 1 (ERS-1): Synthetic Aperture Radar (SAR) data
 European Remote Sensing Satellite 2 (ERS-2): Synthetic Aperture Radar (SAR) data
 ENVISAT satellite: Advanced Synthetic Aperture Radar (ASAR) data
 Level1b GOME-2 data onboard MetOp B
 MEdium Resolution Imaging Spectrometer (MERIS): Level 1B reprocessed radiance product
 MIPAS ENVISAT Level 2 data (July 2002 - March 2004) Processor version IPF v4
 AATSR: Multimission land and sea surface data, v1.1
 ATSR-2: Multimission land and sea surface temperature data, v1.1
 ATSR-1: Multimission land and sea surface data, v1.1
 AATSR: Three Band Colour Composite Browse Product (ATS_AST_BP), v2.1
 ATSR-1: Average Surface Temperature (AST) product (AT1_AR__2P), v2.1
 ATSR-1: Three Band Colour Composite Browse Product (AT1_AST_BP) v2.1
 ATSR-2: Gridded Surface Temperature (GST) Product (AT2_NR__2P), v2.1
 ATSR-2: Gridded Brightness Temperature/Reflectance (GBTR) Product (AT2_TOA_1P), v2.1
 ATSR-1: Gridded Surface Temperature (GST) Product (AT1_NR__2P), v2.1
 AATSR: Sea Surface Temperature Meteo Product (ATS_MET_2P), v2.1
 AATSR: L2P Product (AATSR L2P) sea surface temperature values, v2.1
 ATSR-1: L3U Product (ATSR-1 L3U) sea surface temperature values, v2.1
 AATSR: Averaged Surface Temperature (AST) product (ATS_AR__2P), v2.1
 ATSR-2: L3U Product (ATSR-2 L3U) sea surface temperature values, v2.1
 ATSR-2: Sea Surface Temperature Meteo Product (AT2_MET_2P), v2.1
 SCIAMACHY: Level 1b radiance products version 7.04
 AATSR: Level 2 University of Leicester Land Surface Temperature (LST) product (UOL_LST_2P), v2.1
 ATSR-2: Average Surface Temperature (AST) Product (AT2_AR__2P), v2.1
 ATSR-2: L2P Product (ATSR-2 L2P) sea surface temperature values, v2.1
 ATSR-1: Gridded Brightness Temperature/Reflectance (GBTR) product (AT1_TOA_1P), v2.1
 ATSR-1: Sea Surface Temperature Meteo Product (AT1_MET_2P) v2.1
 AATSR: Gridded Brightness Temperature/Reflectance (GBTR) product (ATS_TOA_1P), v2.1
 SCIAMACHY: Level 2 vertical columns of trace gases products version 5.02
 ATSR-2: Three Band Colour Composite Browse Product (AT2_AST_BP), v2.1
 AATSR: Gridded Surface Temperature (GST) product (ATS_NR__2P), v2.1
 ATSR-1: L2P Product (ATSR-1 L2P) sea surface temperature values, v2.1
 AATSR: L3U Product (AATSR L3U) sea surface temperature values, v2.1
 WLSTA: Decadal Full Resolution (1 km) of the Land Surface Temperature fields over Europe
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Single Look Complex (SLC) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Single Look Complex (SLC) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Stripmap (SM) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Stripmap (SM) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Stripmap (SM) mode Ground Range Detected (GRD) Full Resolution (FR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): SM mode SLC Level 1 data
 MIPAS ENVISAT Level 1b data (July 2002 up to April 2012) IPF v7 data
 MIPAS ENVISAT Level 1b data (July 2002 up to April 2012) IPF v5 data
 MIPAS ENVISAT Level 1b data (July 2002 up to April 2012) IPF v4 data
 Sentinel 3A Synthetic Aperture Radar Altimeter (SRAL) Level 1B data
 Sentinel 3A Ocean and Land Colour Instrument (OLCI) Ocean Colour Full Resolution (EFR) data
 Sentinel 3A Sea and Land Surface Temperature Radiometer (SLSTR) Level 2 data
 MEdium Resolution Imaging Spectrometer (MERIS): Level 2 reprocessed retrieved parameters products
 AATSR: Multimission land and sea surface data, v2.0
 ATSR-1: Multimission land and sea surface data, v2.0
 ATSR-2: Multimission land and sea surface temperature data, v2.0
 ATSR-1: Multimission land and sea surface removal data, v2.1
 ATSR-2: Multimission land and sea surface removal data, v2.1
 MEdium Resolution Imaging Spectrometer (MERIS): Level 1B reprocessed radiance product, Version 3
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Single Look Complex (SLC) Level 1 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 2B Multispectral Instrument (MSI) Level 1C data
 Sentinel 5P: TROPOspheric Monitoring Instrument (TROPOMI) Radiance level 1b data.
 Sentinel 5P: Total Column Ozone (O3) level 2 data
 Sentinel 5P: Nitrogen Dioxide (NO2) Total Column level 2 data
 Sentinel 5P: Carbon Monoxide (CO) Total Column level 2 data
 Sentinel 5P: Cloud level 2 data
 Sentinel 5P: Ultraviolet (UV) Aerosol Index level 2 data
 Sentinel 5P: TROPOspheric Monitoring Instrument (TROPOMI) level 1b Irradiance product UVN module data.
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ocean (OCN) Level 2 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ocean (OCN) Level 2 data
 Sentinel 3B Sea and Land Surface Temperature Radiometer (SLSTR) Level 1B radiances and brightness temperature data
 Sentinel 3B Ocean and Land Colour Instrument (OLCI) Ocean Colour Full Resolution (EFR) data
 Sentinel 5P: Sulphur Dioxide (SO2) Total Column level 2 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Wave (WV) mode Ocean (OCN) Level 2 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Wave (WV) mode Ocean (OCN) Level 2 data
 Sentinel 5P: Methane (CH4) Total Column level 2 data
 ESA Water Visible Absorption Cross-Section measurements
 Advanced Visible and Near InfraRed Radiometer type 2 (AVNIR 2) UK data
 Advanced Land Observing Satellite (ALOS) Phased Array type-L band Synthetic Aperture Radar (PALSAR) UK imagery
 Solar and Heliospheric Observatory (SOHO) Project Data
 ENVISAT Advanced Synthetic Aperture Radar (ASAR) UK imagery

 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global ocean colour data products gridded on a sinusoidal projection (All Products), Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): 8-day global ocean colour data products gridded on a sinusoidal projection (All Products), Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Monthly global ocean colour data products gridded on a sinusoidal projection (All Products), Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global chlorophyll-a data products gridded on a sinusoidal projection, Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global attenuation coefficient for downwelling irradiance (Kd490) gridded on a sinusoidal projection, Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global remote sensing reflectance gridded on a sinusoidal projection, Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global remote sensing reflectance gridded on a geographic projection, Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global attenuation coefficient for downwelling irradiance (Kd490) gridded on a geographic projection, Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global dataset of inherent optical properties (IOP) gridded on a geographic projection, Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global chlorophyll-a data products gridded on a geographic projection, Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Yearly global ocean colour data products gridded on a geographic projection (All Products), Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Monthly global ocean colour data products gridded on a geographic projection (All Products), Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): 8-day global ocean colour data products gridded on a geographic projection (All Products), Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean Colour CCI): Daily global ocean colour data products gridded on a geographic projection (All Products), Version 1.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global ocean colour data products gridded on a sinusoidal projection (All Products), Version 2.0.
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a geographic projection, Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global dataset of inherent optical properties (IOP) gridded on a geographic projection, Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global chlorophyll-a data products gridded on a sinusoidal projection, Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a sinusoidal projection, Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global chlorophyll-a data products gridded on a geographic projection, Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global remote sensing reflectance gridded on a sinusoidal projection, Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global remote sensing reflectance gridded on a geographic projection, Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global ocean colour data products gridded on a geographic projection (All Products), Version 2.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global dataset of inherent optical properties (IOP) gridded on a sinusoidal projection, Version 2.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Gravimetric Mass Balance Gridded product, v1.1
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Ice velocity time series for Pine Island Glacier, Antarctica, 2014-2016, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Drygalski, Cook, Ninnis and Mertz Glaciers, Antarctica, 1996 - 2017, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Evans and Rutford Glaciers, Antarctica, 1995 - 2016, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Fleming and Larsen Glaciers, Antarctica, 1995 - 2016, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Getz Glacier, Antarctica, 1996-2017, v2.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Jutulstraumen, Nivlisen & Belgium Glaciers, Antarctica, 1994 - 2016, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Lambert and West Ice Shelf Glaciers, Antarctica, 1996 - 2016, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Slessor Glacier, Antarctica, 1995-2016, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Denman and Totten Glaciers, Antarctica, 1996/2015, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Sulzberger Glacier, Antarctica, 1996/2016, v2.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Ross and Byrd Glaciers, Antarctica, 2011- 2017, v1.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Gravimetric Mass Balance Basin products, v1.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global dataset of inherent optical properties (IOP) gridded on a sinusoidal projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global ocean colour data products gridded on a geographic projection (All Products), Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global chlorophyll-a data products gridded on a geographic projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a geographic projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global dataset of inherent optical properties (IOP) gridded on a geographic projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global remote sensing reflectance gridded on a geographic projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global remote sensing reflectance gridded on a sinusoidal projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a sinusoidal projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global chlorophyll-a data products gridded on a sinusoidal projection, Version 3.1
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global ocean colour data products gridded on a sinusoidal projection (All Products), Version 3.1
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Ferringo, Pine Island, Thwaites, Smith, Kohler and Pope Glaciers, Antarctica, 1995-2017, v2.0
 ESA Antarctic Ice Sheet Climate Change Initiative (Antarctic_Ice_Sheet_cci): Grounding Line Locations for the Ferringo, Pine Island, Thwaites, Smith, Kohler and Pope Glaciers, Antarctica, 1995-2017, v2.0 (CCI subset)
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global remote sensing reflectance gridded on a sinusoidal projection, Version 4.0
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global remote sensing reflectance gridded on a sinusoidal projection, Version 4.2
 ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global remote sensing reflectance gridded on a sinusoidal projection, Version 5.0

 Sentinel 2A Multispectral Instrument (MSI) Level 1C data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Stripmap (SM) mode Ground Range Detected (GRD) Full Resolution (FR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): SM mode SLC Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Single Look Complex (SLC) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Stripmap (SM) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Single Look Complex (SLC) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Stripmap (SM) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 3A Sea and Land Surface Temperature Radiometer (SLSTR) Level 1B radiances and brightness temperature data
 ESA Sea Ice CCI: Ice Concentration products
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Single Look Complex (SLC) Level 1 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ground Range Detected (GRD) High Resolution (HR) Level 1 data
 Sentinel 3A Sea and Land Surface Temperature Radiometer (SLSTR) Level 2 data
 Sentinel 2B Multispectral Instrument (MSI) Level 1C data
 Sentinel 5P: TROPOspheric Monitoring Instrument (TROPOMI) Radiance level 1b data.
 Sentinel 5P: Total Column Ozone (O3) level 2 data
 Sentinel 5P: Nitrogen Dioxide (NO2) Total Column level 2 data
 Sentinel 5P: Carbon Monoxide (CO) Total Column level 2 data
 Sentinel 5P: Cloud level 2 data
 Sentinel 5P: Ultraviolet (UV) Aerosol Index level 2 data
 Sentinel 5P: TROPOspheric Monitoring Instrument (TROPOMI) level 1b Irradiance product UVN module data.
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ocean (OCN) Level 2 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Interferometric Wide (IW) mode Ocean (OCN) Level 2 data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): SM mode SLC Level 1 data
 Sentinel 3A Synthetic Aperture Radar Altimeter (SRAL) Level 1B data
 Sentinel 3B Sea and Land Surface Temperature Radiometer (SLSTR) Level 1B radiances and brightness temperature data
 Sentinel 1B C-band Synthetic Aperture Radar (SAR): Wave (WV) mode Ocean (OCN) Level 2 data
 Sentinel 1A C-band Synthetic Aperture Radar (SAR): Wave (WV) mode Ocean (OCN) Level 2 data
 Sentinel 5P: Methane (CH4) Total Column level 2 data
 Sentinel 5P: Sulphur Dioxide (SO2) Total Column level 2 data
 Sentinel 3A Synthetic Aperture Radar Altimeter (SRAL) Level 2 data
 Sentinel 5P: Suomi-NPP VIIRS Clouds level 2 data
 Sentinel 3B Synthetic Aperture Radar Altimeter (SRAL) Level 1B data