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Radiation

HelioClim-3 solar radiation
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HelioClim-3 solar radiation time series

This service delivers:

  • Global, diffuse, direct, reflected irradiation for actual weather conditions and clear-sky irradiation
  • At horizontal, fix-tilted and normal planes
  • Geographical coverage is Europe, Africa, Atlantic Ocean, Middle East
  • Spatial resolution is 3 km at Nadir, and approx. 4-5 km at 45° of latitude
  • Time steps ranging from 1 min to 1 month
  • Data available from Feb. 2004 up to current day-1

 

For registered users only. Demo version. Please contact us for more information.

 

HelioClim-3 AI solar forecast for today and tomorrow

This service provides time series of Artificial Intelligence solar radiation forecast for today and tomorrow. 

This service is based on a machine learning method called Gradient Boosting.

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HelioClim-3 solar forecast for today

Provides 15 min and hourly HelioClim-3 (version 5) solar radiation time series for the current day and for d+1.

Current day: the service is updated in real time from sunrise with the latest upcoming Meteosat image, to provide HelioClim-3v5 time series. It is completed until the end of the current day with a persistence model.

CAMS radiation

This service provide 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. The geographical coverage is Europe, Africa, Atlantic Ocean, Middle East. Spatial resolution is 3 km at Nadir, and approx. 4-5 km at 45° of latitude. Time steps ranging from 15 min to 1 month. From Feb. 2004 up to current day-2. A height correction is applied on the radiation value.

CAMS McClear

This service provide time series of Global, Direct, and Diffuse Irradiations on horizontal surface, and Direct Irradiation on normal plane (DNI) under clear sky conditions. Available worldwide. Time step ranging from 1 min to 1 month. From Jan. 2004 up to current day-2. A height correction is applied on the radiation value.

HelioClim-1

This service provides time series of HelioClim-1 monthly, weekly and daily Global Solar Irradiation values over a horizontal plane, as well as monthly irradiation received by a plane normal to sun rays. The geographical coverage corresponds to the Meteosat satellite  field of view, i.e. covers Europe, Africa, Atlantic Ocean, Middle East. The spatial resolution is approx. 20 km. The time coverage of data is from 1985 to 2005.

Extraterrestrial Irradiance and Top of Atmosphere

Daily values of Extraterrestrial Irradiance (E0), i.e. received by a plane normal to sun rays and outside the atmosphere, and Top of Atmosphere (ToA) radiation, i.e. received by a horizontal surface and outside the atmosphere. E0, in W/m², depends on the sun-earth distance, and thus on the date. ToA is given in irradiance (W/m²) and irradiation (J/m², Wh/m²).

 

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Spectral Radiation

Spectral irradiation from HelioClim-3

This service provides time series of UV-A (315–400 nm) and UV-B (280–315 nm) Irradiation values over a horizontal plane computed from the satellite-derived radiation database HelioClim-3. The geographical coverage corresponds to the Meteosat satellite field of view, i.e. covers Europe, Africa, Atlantic Ocean, Middle East. Spatial resolution is 3 km at Nadir and is increasing as soon as we get away from this point (see illustration on the right hand side). Temporal coverage of data is 2004-02-01 up to current day-2.

UV from HelioClim-1

This service provides time series of HelioClim-1 daily UV-A, UV-B and Erythemal Daily Irradiation values over a horizontal plane. The geographical coverage corresponds to the Meteosat satellite field of view, i.e. covers Europe, Africa, Atlantic Ocean, Middle East. The spatial resolution is approx. 20 km. The time coverage of data is from 1985 to 2005.

Guidelines for UV exposure

Daily values of UV exposure computed from HelioClim-1 solar radiation database, which implements the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines on protection against UV radiation regarding exposure of the skin.

 

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Ground (altitude and ground properties)

Albedo

Daily or monthly ground albedo for a given location.

Albedo computed from MODIS fiso, fgeo and fvol components and exploited in the McClear computations. On demand.

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MODIS albedo components

Monthly average values for MODIS fiso, fvol and fgeo components

Please contact us to send your geographical coordinates, we will send you back the monthly average values of MODIS components for your locations.

NB: Maps available for download on the page accessible via the "info" button.

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Altitude of a point

This Web service, provided by MINES ParisTech, returns the altitude value in meters from the Shuttle Radar Topography Mission (SRTM) of NASA (USA), from GTOPO30" and from TerrainBase5'.

SRTM in a tile

This service provides tiles of surface elevation from the Shuttle Radar Topography Mission (SRTM) of NASA (USA). Please note that it is listed in the catalog www.webservice-energy.org. Click on "more informations" to visit the website of the catalog.

 

 

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Astronomy

Solar Geometry 2

Solar Geometry 2 is the second generation of library for computing the relative position of the sun and the earth made by the MINES ParisTech. Valid over the time period 1980-2030, the algorithm is 20 times faster than the well-know SPA algorithm (Solar Position Algorithm), with an accuracy order of approx. 0.005°. The code is available both in C langage and in Matlab. More information on the MINES ParisTech OIE research lab website.

Solar Geometry 1

Daily values of solar declination, distance Earth to Sun, difference true and mean solar time, daylength, sunrise and sunset computed with the Solar Geometry 1 library. The code is available in C. More information on the MINES ParisTech OIE research lab website.

 

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Atmosphere

APOLLO Cloud Statistics

APOLLO cloud properties

This Web service, granted by ESA and provided by both DLR and TRANSVALOR, provides reports in pdf format with the APOLLO cloud physical parameters statistics on a limited number of sites, as a further help in the characterization of a solar site.

The August 2015 description of the product and statistics has been improved and enriched with examples and feedback from our user's trials. It describes also the two products which are available "on demand" from Transvalor.

Aerosol Optical Depths by CAMS

CAMS-AOD service

Available worldwide, the service delivers time series of aerosols provided by ECMWF. Time coverage is from 2004-01-01 up to current day-2. Time step is 3 hours.

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 EU-funded project, 2011-2014), and current CAMS project.

Turbidity Linke factor 2010

Monthly and yearly average values of Turbidity Linke factor 2010.

Service currently available on demand. Please contact us to send your geographical coordinates, we will send you back the monthly and yearly average values of Tl 2010 for your locations.

NB: Maps available for download on the page accessible via the "info" button.
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Meteorology

MERRA

The Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) Web service, available worldwide, delivers time series of Temperature (at 2 m), Relative Humidity (at 2 m), Pressure (at 2 m), Wind speed and direction (at 10 m), Rainfall, Snowfall and Snow depth, with a time step of 1 hour, 1 day and 1 month, and a spatial resolution of approx. 50 km. The data are available since Jan. 1980 and are regularly updated with approx. one month of delay. More information

GFS forecasts

The Global Forecast System Web service, available worldwide, delivers time series of Temperature (at 2 m), Relative Humidity (at 2 m), Pressure (at 2 m), Wind speed and direction (at 10 m), Rainfall, Snowfall, Snow depth, and Short-wave irradiation (GHI).

Time steps range from 1 min up to 1 month. The spatial resolution is 0,25°. Data are available from 1 month ago up to day+3.

GFS is a weather forecast model produced by the National Centers of Environmental Prediction (NCEP). More information

 

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Typical Years

Frequency of types of sky

This service provides monthly frequencies of three different sky types: sunny, intermediate and cloudy, for a period covering 1996 to 2000, for any site located in Western and Central Europe (source: Satel-Light). Provider: Ecole Nationale des Travaux Publics de l'Etat, France. More information

Monthly means of solar irradiance, temperature and relative humidity

This service delivers monthly and yearly means of solar irradiance (downwelling shortwave irradiance), daily minima, maxima and mean values of air temperature at 2 m, and daily minima, maxima and mean of relative humidity at 2 m, averaged over the period 1990-2004 (15 years). The data are available worldwide.

This database has been created by data fusion techniques applied to satellite data, meteorological re-analyses from NCEP / NCAR (USA) and orography.

 

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Validation

Validate your measurements

This service assesses the quality of measurements of daily global irradiation or daily means of global irradiance acquired by a ground station. Measurements are checked against models resulting in a measure of plausibility.

 Irradiation validation report

This service performs a comparison of HelioClim-3 version 4, HelioClim-3 version 5 or CAMS Radiation Service (CRS) estimates of surface solar radiation against qualified ground measurements. It returns a HTML page that contains statistics of comparison and graphs. The time coverage of the CAMS Radiation Service and HelioClim-3 version 5 databases is from 2004-02-01 up to 2 days ago, and up to d-1 for HelioClim-3 version 4. Each station has its own temporal coverage. The period of validation must be selected within this period of data availability. The geographical coverage is the field-of-view of the Meteosat satellites, roughly speaking Europe, Africa, Atlantic Ocean, Middle East (-66° to 66° in both latitudes and longitudes).
 
This service is making use of data from the Copernicus Atmosphere Monitoring Service (CAMS), a European Union programme implemented by ECMWF.
 
The Irradiation Validation Report service has been upgraded during the release of June 2018; it allows you to compare HelioClim-3 and CAMS Radiation data with ground measurements at 54 locations for hourly and daily time steps.