Geographical extension

Last update: Dec. 2017

    Objective of the service - Characteristics - Steps of developments - Bibliography Heliosat-5


Objective of the service

The satellite-derived solar radiation database HelioClim-3 was so far limited to the coverage of the Meteosat Second Generation satellite, i.e. -66° to 66° both in latitude and longitude. The objective is to develop an operational service to process the real time Meteosat Second Generation images now available on the Indian ocean for the IODC service.

For that purpose, Transvalor has invested on a PhD thesis. Benoit Tournadre joined MINES ParisTech two months ago and is buried under a large volume of publications to build his bibliography.

In the meantime, we aim at developing a precursor of service which could be available to users in the meantime of the developments within the framework of this thesis.

Characteristics of the service


  • the Meteosat images
  • McClear clear sky values for the MODIS albedo  

Methodology for the precursor of service:

  • Rho_sat identical to the one of Heliosat-2
  • Rho_cloud identical to the one of Heliosat-2
  • All the work is focused on Rho_clear, which exploits McClear to avoid the weakness of Heliosat-2 (Rho_g et Kc_max)


  • Direct usage of McClear (instead of indirect like in HelioClim-3 version 5)
  • No problem of sea shore temporal unconsistency
  • Glitter correction included
  • Direct correction of altitude

Steps of developments

(reverse chronological order)

Oct. 2017: precursor of service available but not yet validated. We run out of time to carry out this validation...

Oct. 2017: start of PhD at MINES ParisTech

2017: Research contract between Transvalor and MINES ParisTech

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Bibliography Heliosat-5

(In alphabetic order and and reverse chronological order)

Lefèvre et al. 2013 Lefèvre M., A. Oumbe, P. Blanc, B. Espinar, B. Gschwind, Z. Qu, L. Wald, M. Schroedter-Homscheidt, C. Hoyer-Klick, A. Arola, A. Benedetti, J. W. Kaiser, and J.-J.  Morcrette, 2013. "McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions", Atmos. Meas. Tech., 6, 2403-2418, doi:10.5194/amt-6-2403-2013. McClear



Oumbe et al. 2014 Oumbe A., Z. Qu, P. Blanc, M. Lefèvre, L. Wald, S. Cros, 2014. "Decoupling the effects of clear atmosphere and clouds to simplify calculations of the broadband solar irradiance at ground level". Geoscientific Model Development, 7, 1661-1669, 2014, doi:10.5194/gmd-7-1661-2014. Corrigendum, 7, 2409-2409, 2014. Decoupling cloudless atmosphere and cloud effects


Qu et al. 2016 Qu, Z., Oumbe, A., Blanc, P., Espinar, B., Gesell, G., Gschwind, B., Klüser, L., Lefèvre, M., Saboret, L., Schroedter-Homscheidt, M., and Wald L., 2016. "Fast radiative transfer parameterisation for assessing the surface solar irradiance: The Heliosat-4 method". Meteorologische Zeitschrift, 26, pp. 33-57, doi:10.1127/metz/2016/0781. Heliosat-4




Rigollier et al. 2004 Rigollier C., M. Lefèvre, L. Wald, 2004. "The method Heliosat-2 for deriving shortwave solar radiation from satellite images", Solar Energy 77(2), pp. 159-169, 2004, doi 10.1016/j.solener.2004.04.017




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