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Description

This dataset is produced by the Ocean and Sea Ice Satellite Application Facility (OSI SAF) from the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) instrument onboard the Meteosat Second Generation (MSG-1), Meteosat-8 satellite (launched on 28 August 2002). The dataset covers the Indian Ocean region with latitude of 60S-60N and longitude of 101.5E-18.5W. Level-3C SST, in the NetCDF format recommended by Group for High Resolution Sea Surface Temperature (GHRSST), is identical to Level-2P GHRSST products, 3 refers to gridded products and C to the fact that hourly products result from compositing 15 minutes (MSG) or 30 minutes (GOES-E) data.
The European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), OSI SAF is producing SST products in near real time from MSG/SEVIRI. SEVIRI level 1.5 data are acquired at Meteo-France/Centre de Meteorologie Spatiale (CMS) through the EUMETSAT/EUMETCAST system. SST is retrieved from the SEVIRI infrared channels (10.8 and 12.0 micrometer) using a multispectral algorithm. Atmospheric profiles of water vapor and temperature from a numerical weather prediction model, together with a radiatiave transfer model, are used to correct the multispectral algorithm for regional and seasonal biases due to changing atmospheric conditions. Every 15 minutes slot is processed at full satellite resolution. The operational products are then produced by remapping over a 0.05-degree regular grid (60S-60N and 135W-15W) SST fields obtained by aggregating all 15-minute SST data available in one-hour time, and the priority being given to the value the closest in time to the product nominal hour. The product format is compliant with the GHRSST Data Specification (GDS) version 2.

Product Summary

Platforms
MSG
Instruments
SEVIRI
Spatial Extent

N: 60 S: -60 E: 101.5 W: -18.5

Spatial Resolution
0.05 Decimal Degrees x 0.05 Decimal Degrees
Geographic Region
INDIAN OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2017-03-28
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC) ,
European Meteorological Satellite Organisation (EUMETSAT)
Concept ID
C2036877550-POCLOUD
Data State
ACTIVE
Number of Files/Granules
75787
Processing Level
3
Published
Updated
Science Keywords
Sea Surface Temperature

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

OSISAF. (2017). GHRSST Level 3C Indian-Ocean (IO) sub-skin Sea Surface Temperature from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) on MSG1 in GDS2 format produced by OSISAF [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/GHSIO-3CO01 Date Accessed: 2025-12-14

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
adi_dtime_from_sst Difference in hours between the ADI and SST data hour byte -128 -127 to 127 0.1
dt_analysis The difference between this SST and the previous day's SST analysis kelvin byte -128 -127 to 127 0.1
l2p_flags These flags are important to properly use the data. N/A int N/A 0 to 15 1
lat geographical coordinates, WGS84 projection degrees_north float N/A -90 to 90 1
lon geographical coordinates, WGS84 projection degrees_east float N/A -180 to 180 1
or_latitude Original latitude of the SST value degrees_north short -32768 -9000 to 9000 0.01
or_longitude Original longitude of the SST value degrees_east short -32768 -18000 to 18000 0.01
quality_level These are the overall quality indicators and are used for all GHRSST SSTs N/A byte -128 0 to 5 1
satellite_zenith_angle The satellite zenith angle at the time of the SST observations. angular_degree byte -128 -90 to 90 1
sea_ice_fraction Fractional sea ice cover from OSISAF ice product byte -128 0 to 100 0.01
sea_surface_temperature Temperature of the subskin of the ocean kelvin short -32768 -300 to 4500 0.01
solar_zenith_angle The solar zenith angle at the time of the SST observations. angular_degree byte -128 -90 to 90 1
sources_of_adi This variable provides a pixel by pixel description of where aerosol optical depth were derived from. N/A byte -128 0 to 2 1
sses_bias Bias estimate derived using the techniques described at http://www.ghrsst.org/SSES-Description-of-schemes.html kelvin byte -128 -127 to 127 0.01
sses_standard_deviation Standard deviation estimate derived using the techniques described at http://www.ghrsst.org/SSES-Description-of-schemes.html kelvin byte -128 -127 to 127 0.01
sst_dtime time plus sst_dtime gives seconds after 00:00:00 UTC January 1, 1981 seconds int -2147483648 -2147483647 to 2147483647 1
time reference time of sst file seconds since 1981-01-01 00:00:00 int N/A N/A 1
wind_speed These wind speeds were created by the ECMWF and represent winds at 10 metres above the sea surface. m s-1 byte -128 0 to 127 1
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