Validation results HC3v4 and HC3v5

Last update: Apr. 2018

    Online pages - Bibliography validation results

  This section presents validation results resulting from several campaigns of comparison of HelioClim-3 version 4 and version 5 against in-situ measurements.

In-situ measurements have been priorly qualified using a careful quality check procedure to discard outliers and aggregate data to higher temporal summarization (from intra-daily values to daily and monthly values). A validation protocol of the data describes which statistical indices should be computed to obtain complete and trustful validation results.

NB concerning Direct Normal Irradiance component validation results: Measurements with a pyrheliometer (Direct Normal Irradiance component): the pyheliometers have a larger half opening angle than the satellite-based estimations (HelioClim-3, MACC-RAD...) which obeys by construction to the definition given by the community of the radiative transfer models where the sun is more punctual. This has a very limited influence in clear sky conditions, but in overcast conditions, the contribution of the circumsolar  irradiance to the pyrheliometer measurements may exceed 50% due to specific effects of clouds, especially that of cirrus clouds. No correction is presently brought to the HelioClim-3 or MACC-RAD outputs.

Online pages of validation results

*MSG coverage*

14 BSRN stations

14 Baseline Surface Radiation Network (BSRN) stations spread in the Meteosat 2nd generation coverage, 1 min values.

More info on the BSRN stations =>

See obsolete prior validation results (McClear v2)

See online validation results

 

Take a look to obsolete
validation results

*BELGIUM*

8 RMI stations

8 stations from the Belgian Royal Meteorological Institute (RMI), hourly values

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

See online validation results

*BRAZIL*

31 INMET stations

31 stations from the Instituto Nacional de Meteorologia (INMET), hourly values

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

See online validation results

*BRAZIL*

11 INPE stations

11 stations from the Instituto Nacional de Pesquisas Espaciais (INPE), 1 min values

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

See online validation results

*MOROCCO*

5 stations

See publications Marchand et al. 2018 in the list below

*MSG coverage*

Irradiation validation report

This online service proposes a "on-the-fly" quality assessment of daily and hourly Global Horizontal Irradiation data for three satellite-based resources versus the measurements of 31 stations of the WRDC network. Resources are HelioClim-3 version 4, HelioClim-3 version 5 and CAMS Radiation service. Select the temporal of you choice in the temporal coverage available for each station, and then retrieve a full report in html format of quality assessment.

 

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Bibliography Validation Results

(In alphabetic order and and reverse chronological order)

Boilley et al. 2016

Boilley A., C. Thomas, M. Marchand, E. Wey, P. Blanc Philippe, 2016. "The Solar Forecast Similarity Method: a new method to compute solar radiation forecasts for the next day". SHC 2015, Istanbul, Turkey, 2-4 December 2015. Energy Procedia, 91, 1018-1023, 2016.

HC3v4 solar forecast similarity method

 

Eissa et al. 2015 Eissa Y., M. Korany, Y. Aoun, M. Boraiy, M. Abdel Wahab, S. Alfaro, P. Blanc, M. El-Metwally, H. Ghedira and L. Wald, 2015. "Validation of the surface downwelling solar irradiance estimates of the HelioClim-3 database in Egypt". Remote Sensing, 7, 9269-9291, 2015, doi:10.3390/rs70709269. HelioClim-3

 

Eissa et al. 2015 Eissa Y., Munawwar S., Oumbe A., Blanc P., Ghedira H., Wald L., Bru H., Goffe D., 2015. "Validating surface downwelling solar irradiances estimated by the McClear model under cloud-free skies in the United Arab Emirates", Solar Energy, 114, 17-31, doi:10.1016/j.solener.2015.01.017. McClear

 

Ineichen 2016 Ineichen P., 2016. "Long Term HelioClim-3 global, beam and diffuse irradiance validation" University of Geneva, February 2016. HC3v4 and v5 validation results

Content: objective validation results ordered by Transvalor directly to Pierre Ineichen. Major result underlined by Pierre is the improvement of version 5 of HelioClim-3 (CAMS McClear clear sky model) compared to obsolete version 4. Please note that these results don't take into account version 3 of CAMS McClear available since Oct. 2017.

Marchand et al. 2018

Marchand M., A. Ghennioui, E. Wey, and L. Wald, 2018. "Comparison of several satellite-derived databases of surface solar radiation against ground measurement in Morocco", Adv. Sci. Res., 15, 21-29, https://doi.org/10.5194/asr-15-21-2018

HC3v4, v5 and CAMS rad, validation results

 

Marchand et al. 2017

Marchand, M., Al-Azri, N., Ombe-Ndeffotsing, A., Wey, E., and Wald, L., 2017. "Evaluating meso-scale change in performance of several databases of hourly surface irradiation in South-eastern Arabic Pensinsula", Adv. Sci. Res., 14, 7-15, doi:10.5194/asr-14-7-2017.

HC3v4, v5 and CAMS rad, validation results

Content: the solar hourly global irradiation received at ground level estimated by the databases HelioClim- 3v4, HelioClim-3v5 and CAMS Radiation Service are compared to coincident measurements made in five stations in Oman (Sunainah, Adam Airport, Sur, Muscat Airport) and Abu Dhabi (Shams). 5 stations - poster . Please note that these results are obsolete since they doesn't take into account the bias correction and McClear v3 of Oct. 2017.

Muneer et al. 2002 Muneer T, and X. Zhang, 2002. "A new method for correcting shadow band diffuse irradiance data" Journal of Solar Energy Engineering 124(1), Feb. 2002. DOI: 10.1115/1.1435647 Rotating Shadow-band correction

Content: If you need to handle the measurements of the Diffuse Horizontal component acquired by a pyranometer and a shadow-band, the values will likely be underestimated. This is due to the fact that the band is occulting a part of the sky and thus a part of diffuse that should be collected by the sensor. Here at MINES ParisTech/Transvalor, we decided to apply the Muneer-Zhang correction which sligthly increase the values for the diffuse component.

Thomas et al. 2016

Thomas C., E. Wey, P. Blanc, L. Wald, M. Lefèvre, 2016. "Validation of HelioClim-3 version 4, HelioClim-3 version 5 and MACC-RAD using 14 BSRN stations". SHC 2015, Istanbul, Turkey, 2-4 December 2015. Energy Procedia, 91, 1059-1069, 2016.

Idem

 

Thomas et al. 2016 Thomas C., Wey E., Blanc P., Wald L, 2016. "Validation of three satellite-derived databases of surface solar radiation using measurements performed at 42 stations in Brazil". Advances in Science and Research, 13, 81-86, 2016, doi:10.5194/asr-13-81-2016. Idem

 

Thomas et al. 2016 Thomas C., Saboret L., Wey E., Blanc P., Wald L, 2016. "Validation of the new HelioClim-3 version 4 real-time and short-term forecast service using 14 BSRN stations". Advances in Science and Research, 13, 129-136, 2016, doi:10.5194/asr-13-129-2016 HC3v4 real-time and short term forecast service

 

Trolliet et al. 2018 Trolliet, M., Walawender, J. P., Bourlès, B., Boilley, A., Trentmann, J., Blanc, P., Lefèvre, M., and Wald, L. 2017. "Estimating downwelling solar irradiance at the surface of the tropical Atlantic Ocean: A comparison of PIRATA measurements against several re-analyses and satellite-derived data sets", Ocean Sci. Discuss., https://doi.org/10.5194/os-2017-95, in review, 2017. Comparison HelioClim 3v5, SARAH 2 and CAMS Radiation Service v2 versus PIRATA (Atlantic) stations

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