CAMS radiation service

Last update: Sept. 2017

    PresentationCredits - Validation - Automatic access - Further questions? - Release notes

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PRESENTATION

This service provides time series of Global, Direct, and Diffuse Irradiations on horizontal surface, and Direct Irradiation on normal plane (DNI) for the actual weather conditions as well as for clear-sky conditions.

  • Geographical coverage : field-of-view of the Meteosat satellite, roughly speaking Europe, Africa, Atlantic Ocean, Middle East (-66° to 66° in both latitudes and longitudes)
  • Temporal coverage of data is from 2004-02-01 up to 2 days ago (NEW)
  • Time step: from 1 min to 1 month.
  • Maximum number of requests per day and per registered user: 15. This limit may evolve.

Routines to read CAMS radiation service output CSV file:

  Main publications

The main publications for CAMS radiation service are Qu et al. 2016 and Schroedter-Homscheidt et al. 2016.
More publications on CAMS radiation service on this page (keyword: "Heliosat-4" or "CAMS radiation service").

 
The CAMS Radiation Service in a nutshell - Version 6 (December 2016)
 
User's Guide to the CAMS Radiation Service - December 2016

  Outputs

  1. Observation period: beginning/end of the time period with the format "yyyy-mm-ddTHH:MM:SS.S/yyyy-mm-ddTHH:MM:SS.S"
  2. TOA: Irradiation on horizontal plane at the top of atmosphere (Wh/m2)
  3. Clear sky GHI: Clear sky global irradiation on horizontal plane at ground level (Wh/m2)
  4. Clear sky BHI: Clear sky beam irradiation on horizontal plane at ground level (Wh/m2)
  5. Clear sky DHI: Clear sky diffuse irradiation on horizontal plane at ground level (Wh/m2)
  6. Clear sky BNI: Clear sky beam irradiation on mobile plane following the sun at normal incidence (Wh/m2)
  7. GHI: Global irradiation on horizontal plane at ground level (Wh/m2)
  8. BHI: Beam irradiation on horizontal plane at ground level (Wh/m2)
  9. DHI: Diffuse irradiation on horizontal plane at ground level (Wh/m2)
  10. BNI: Beam irradiation on mobile plane following the sun at normal incidence (Wh/m2)
  11. Reliability: Proportion of reliable data in the summarization (0-1)

In verbose mode (1 minute summarization only), additional columns are:

  1. sza. Solar zenith angle for the middle of the summarization (deg)
  2. atm. Atmospheric profile code: afglus=U.S. standard afglt=tropical afglms=midlatitude summer afglmw=midlatitude winter afglss=subarctic summer afglsw=subarctic winter
  3. tco3. Total column content of ozone (Dobson unit)
  4. tcwv. Total column content of water vapour (kg/m2)
  5. AOD BC. Partial aerosol optical depth at 550 nm for black carbon
  6. AOD DU. Partial aerosol optical depth at 550 nm for dust
  7. AOD SS. Partial aerosol optical depth at 550 nm for sea salt
  8. AOD OR. Partial aerosol optical depth at 550 nm for organic matter
  9. AOD SU. Partial aerosol optical depth at 550 nm for sulphate
  10. AOD 550. Aerosol optical depth at 550 nm
  11. AOD 1240. Aerosol optical depth at 1240 nm
  12. alpha. Angstroem coefficient for aerosol
  13. Aerosol type. Type of aerosol: -1=no value 5=urban 7=continental clean 8=continental polluted 9=continental average 10=maritime clean 11= maritime polluted 12=maritime tropical 13=antarctic 14=desert
  14. fiso. MODIS-like BRDF parameter fiso
  15. fvol. MODIS-like BRDF parameter fvol
  16. fgeo. MODIS-like BRDF parameter
  17. albedo. Ground albedo
  18. Cloud optical depth  (value of the nearest acquisition time of the pixel)
  19. Cloud coverage of the pixel (percentage from 0 to 100, value of the nearest acquisition time of the pixel)
  20. Cloud type (value of the nearest acquisition time of the pixel) -1=no value 0=no clouds 5=low-level cloud 6=medium-level cloud 7=high-level cloud 8=thin cloud

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CREDITS

The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 218793 (MACC project, 2009-2011), no. 283576 (MACC-II project, 2011-2014) and from the European Union's H2020 Programme (FP7/2007-2013) under grant agreement no. 633080 (MACC-III project, 2014-2015). The service is part of the Copernicus Atmosphere Monitoring Service (CAMS).    

 

VALIDATION

- Regular quaterly validation reports

- Other validations of CAMS radiation by third parties

- Illustrations of the CAMS radiation bias and RMSE (created by L. Wald on 2016-11-29):

Map of the relative bias for CAMS Radiation. Green circles mean a relative bias less than 3% in absolute value. Triangle size is proportional to relative bias. Upward triangle: overestimation; downward triangle: underestimation.
Results from Armines intern (2015 BSRN), CAMS Irradiation Validation Service (performed on 2016-11-28), Marchand et al. (2017), Qu et al. (2017 BSRN), Thomas et al. (2016, BSRN and Brazil). At least 2 years of data per site.

    

Map of the relative RMSE for daily mean of irradiance for CAMS Radiation. Green circles mean a relative RMSE less than 5%, i.e. daily data of moderate quality or better. Triangle size is proportional to relative RMSE.
Results from Armines intern (2015 BSRN), CAMS Irradiation Validation Service (performed on 2016-11-28, Thomas et al. (2016, BSRN and Brazil). At least 2 years of data per site.

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AUTOMATIC ACCESS

The WPS (Web Processing Service) is a means to invoke the CAMS radiation services by a computer, without human-machine interface. This is the means that has been selected to fulfill the request for automated access. This way of doing is a standard in Earth observation and digital geography and offers many other advantages than a graphical user interface. In particular, anyone can create a portal invoking CAMS radiation by calling the WPS that we are offering. It greatly helps the dissemination.

These services are described in the catalog
www.soda-is.com/service/wps?SERVICE=WPS&request=GetCapabilities
that reveals the get_mcclear operations.

If you are using an appropriate library, it is fairly easy to develop the application.
Otherwise, you may try to find one. There are plenty, for example google "library execute wps ogc".

The call to DescribeProcess provides a description of the inputs and outputs of each service (that you discover in the result of the call to GetCapabilities):
www.soda-is.com/service/wps?SERVICE=WPS&Request=DescribeProcess&Identifier=get_cams_radiation&version=1.0.0

It is also possible to build a WGET or a CURL command to automatically retrieve CAMS radiation time series. For more details, please refer to the corresponding SoDa page.

FURTHER QUESTIONS?

Contact CAMS User Support

RELEASE NOTES

Date Version Details
2013-07 v2.0 Edition format file version 1
2014-07 v2.1 Bug fixed for the shift of one pixel in APOLLO files import
  v2.2 do not exist (synchronization with McClear versions)
2014-08 v2.3 Call to McClear v2.3 Bug fixed in APOLLO data interpolation
2014-11 v2.4 Call to McClear v2.4
2014-11 v2.5 APOLLO data coverage extension: 2004-02-01 to D-2
2015-01 v2.6 Bug fixed bug for cloud coverage > 100%
Add a verbose edition for the one minute requests
Edition format file version 2
2015-02 v2.6 Bug fixed in the filling of MACC AOD databases
New re-calculated databases put online
2015-07 v2.6 Bug fixed in verbose edition
2015-10 v2.7 Call to McClear v2.7

 

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