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

*CONGO*

2 stations

Mokabi

Latitude: 3.2765°
Longitude: 16.7478°
Elevation: 466.00 m
Begin date for the report: 2016-03-05
End date for the report: 2016-12-31

Conclusions: Good daily coincidence with the data. The overestimation of HC3v5 is certainly due to the fact that HC3v5 doesn't see certain type of clouds. No overestimation in very cloudy situation, as observed in Northern Europe.

NB: Please note that a discussion is also available at the end of this report about the data for the year 2017. The report has not been produced on the whole period due to the trend of the station to depict a progressive decrease in the measurements, probably due either to a problem in the calibration or to some soiling


Download the report

 

Pokola

Latitude: 1.4037°
Longitude: 16.3167°
Elevation: 332.00 m
Begin date for the report: 2016-03-08
End date for the report: 2016-12-31

Conclusions: Very good adequacy between HC3v5 and the station.

NB: same remarks than for Mokabi, except that the data for Pokola were available until Feb. 2018. Same type of trends on the in-situ measurements is observed. For both stations, we recommend to only use the 2016 measurements.


Download the report

 

 

*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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