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Since 2005, ECMWF has generated model-simulated satellite images out to five days from the 00 UTC and 12 UTC  cycles of the operational HRES forecast for all operational geostationary satellites (i.esatellites operated by EUMETSAT (e.g., Meteosat-7, Meteosat-10, MTSAT-2, GOES-13 and GOES-15/8/9/10), NOAA (e.g., GOES-8/10/11/12/13/15) and JMA (e.g., MTSAT-1R/2). The simulated images are archived in MARS as GRIB edition 1 files and have been presented on the ECMWF website as image files. The forecast-generated satellite images have been based on the resolution of the HRES global model with 3-hourly output from T+0 to T+48 and 6-hourly output to T+120.

Up to and including IFS cycle 41r1, the satellite images in both the atmospheric window and water vapour

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regions were simulated over each of the 5 geostationary satellite’s disk.

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Simulated brightness temperatures at a number of wavelengths/bands were calculated using the same radiative transfer algorithm (e.g., RTTOV-11) as in the operational data assimilation and using the relevant atmospheric model profiles (temperature, specific humidity, ozone mass mixing ratio, cloud cover, specific cloud liquid water content, specific cloud ice water content, specific rain water content, specific snow water content) and the relevant surface parameters (skin temperature, 10m u and v wind components, 2m temperature and 2m dewpoint temperature, volumetric soil water layer 1, convective available potential energy).

Errors in simulated satellite images can derive from errors in the NWP parameters, on which the simulation is based, the resolution of the model and RTTOV model performance.

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• Global satellite images capturing detailed cloud and/or humidity features
  The new simulated satellite data product shows the high-resolution ECMWF forecasts as a weather satellite will would see it (e.g. Meteosat-10). The new simulated satellite image product includes latitudes greater than 60° north and south, extending the geostationary-type imagery over high-latitude regions. This is an enhancement with respect to the previous satellite image product which was limited to the Meteosat-10 disk domain.

• Nadir view for every model grid point
  The new simulated satellite data assume a nadir view for every model grid point so the effect of looking slantwise through the atmosphere is neglected. Consequently the atmosphere appears less opaque than with the old simulated images and so lower lying clouds and other features are better presented.
  
  
• Produced in post-processing within the IFS, with no mapping on satellite grid
  This is a technical advantage of the new simulated satellite data being now produced in the post-processing within the IFS and being part of the research tests for operational release. This is an enhancement with respect to the previous product generated only in the early delivery cycles of the operational suite as they can be now used routinely in ECMWF Research Department experiments to validate model developments which affect the temperature and moisture fields.
  
  
• Availability of the simulated satellite data in MARS
  The new simulated satellite data products are archived in MARS in GRIB edition 2 and are available at every post-processing step, out to 240 hours: 3 hourly from T+0 to T+48,  144 and 6 hourly from T+54 150 to T+120 and  then 12 hourly from T+132 to T+240. This is an enhancement with respect to the previous satellite image product available in GRIB edition 1, out to T+120 only.
  
  
• Availability of the simulated satellite data in ECMWF Catalogue and dissemination
  The timeliness of delivery is optimal for dissemination. The new simulated satellite data products will be added to the list of products that can be requested in dissemination.

For the time being only MeteosatAt present only Meteosat-10-like simulated satellite data will be made available. The central wavelength of the channels on other platforms is quite close like simulated satellite data are available. The central wavelength of the channels on other geostationary platforms is quite close to those selected to be produced, archived and disseminated.

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Animation of 10 day global simulated Meteosat-10 SEVIRI imagery at 10.8 μm (channel 9) from the ECMWF model cycle 41r2 at TCO1279 / O1280 horizontal resolution with 137 vertical levels run on 1 March 2016 at 00 UTC.	Animation of 10 day global simulated Meteosat-10 SEVIRI imagery at  6.30 μm (channel 5)from the ECMWF model cycle 41r2 at TCO1279 / O1280 horizontal resolution with 137 vertical levels run on 1 March 2016 at 00 UTC.

Technical information

The simulated satellite data are specified using the satellite identifier, instrument, channel number and central wavelength as given in the WMO Manual on codes:

• COMMON CODE TABLE C–5: Satellite identifier

• COMMON CODE TABLE C–8: Satellite instruments

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GRIB encoding

The simulated satellite data fields are encoded in GRIB edition 2 with the parameter set to Cloudy brightness temperature:

The product description uses productDefinitionTemplateNumber=32 (analysis or forecast at a horizontal level or in a horizontal layer at a point in time for simulated (synthetic) satellite data.  The relevant GRIB API keys are encoded as:

Other GRIB API keys describing the product are:

GRIB API version at least 1.14.5 needs to be used in order to decode the simulated satellite data products.

Simulated satellite data as ECMWF web charts

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RETRIEVE,
    STREAM     = OPER,
    CLASS      = OD,
    EXPVER     = 0001,
    DATE       = -1,
    TIME       = 12,
    TYPE       = SSD,
    IDENT      = 57,
    INSTRUMENT = 207,
    PARAM      = 260510,
    CHANNEL    = 9,
    STEP       = 0/3/6/9/12/15/18/21/24/27/30/33/36/39/42/45/48/54/60/66/72/78/84/90/96/102/108/114/120/132/144/156/168/180/192/204/216/228/240TO/144/BY/3,
    TARGET     = "meteosat-10.channel9.grib2"
RETRIEVE,
    STEP       = 150/TO/240/BY/6,
    TARGET     = "meteosat-10.channel9.grib2"

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The simulated satellite data will be available in dissemination.  Initially, the products will be made available to ECMWF Member and Co-operating States.  Once the products have been added to the real-time catalogue, they will become available also to users obtaining products regulated by the ECMWF Data Licences.

Technical information

The simulated satellite data are specified using the satellite identifier, instrument, channel number and central wavelength as given in the WMO Manual on codes:

• COMMON CODE TABLE C–5: Satellite identifier

• COMMON CODE TABLE C–8: Satellite instruments

.  For the simulated satellite data based on Meteosat-10 these are as in the table below:

GRIB encoding

The simulated satellite data fields are encoded in GRIB edition 2 with the parameter set to Cloudy brightness temperature:

The product description uses productDefinitionTemplateNumber=32 (analysis or forecast at a horizontal level or in a horizontal layer at a point in time for simulated (synthetic) satellite data.  The relevant GRIB API keys are encoded as:

Other GRIB API keys describing the product are:

GRIB API version at least 1.14.5 needs to be used in order to decode the simulated satellite data products.

History of simulated satellite images at ECMWF

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