Validation results HC3v4 and HC3v5 | Last update: Mar. 2018 |
online pages - Bibliography validation results
This section presents the validation results 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
| 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) |  |
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| 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) | - | Validation results |
| 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) | - | Validation results |
| 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) | - | Validation results |
| Irradiation validation report | This online service enables you to carry out the quality assessment of the daily Global Horizontal Irradiation data of three satellite-based resources versus the measurements of 31 stations of the WRDC network. The satellite-based resources are HelioClim-3 version 4, HelioClim-3 version 5 and MACC-RAD. 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. The Irradiation Validation Report service has been upgraded during the release of Oct. 2017; it allows you to compare HelioClim-3 and CAMS Radiation data with ground measurements at 31 locations for hourly and daily time steps. |  |
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. 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" | 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 |