Last update: Jan. 2017

    Presentation - Services - Inputs - Outputs - Validation - Automatic access


The HelioClim-1 database provides 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 for the actual weather conditions.

The Heliosat-2 method is used to update the database.


            \ Plane orientation

Time step

(GHI only)
(all components, horizontal and fix-tilted)
Normal - 2D tracker
(all components, horizontal and normal)
Monthly HC1month - HC1monthDNI
Weekly HC1week - -
Daily HC1day - -
Hourly - - -
15 min (from 1 to 30 min) - - -









Service names: HC1 stands for HelioClim-1 + time step + plane orientation (default: horizontal). Example: HC1day means HelioClim-1 daily irradiation values over a horizontal plane.


  • Latitude and longitude: enter the values in decimal degrees, or directly click on the map to select your point, or you can also use the "Search Address" tool on the top of the map.
  • Start date and End date: format yyyy-mm-dd. Please pay attention to ask for complete months when asking for monthly values. If incomplete, the given monthly value results from an interpolation based on the selected days.
  • Time step: monthly, weekly, daily, hourly, 15 min, and 10 min. The 5, 4, 3, 2, and 1 min time steps are limited to one month of data per delivery.
  • Time reference: UT or TST. More information on time references
  • Plane orientation: enter the tilt and azimuth of the plane. In our azimut conventions, 90° means Easts and 180° means South. Empty is 2D-sun tracking (-999 for both the tilt and the azimuth values). More information on the plane orientations and the radiation components.
  • Output format: CSV


The output format for the HelioClim-3 files is CSV. Click right on the link to retrieve your file.
The description of the columns is available on this page. Just select the service you have just launched to receive the adequate column description.


Independant validation performed by P. Ineichen, University of Geneva - February 2016: Long term HelioClim-3 global, beam and diffuse irradiance validation

Take a look to the results of comparison between HC-3 version 4 and 5 against ground stations measurements:

More information on the protocol of validation and the used indices.

Automatic Access

The automatic (machine-to-machine) access to the HelioClim-3 (and HelioClim-1) dataset is restricted to the customers who have purchased an annual subscription to a HelioClim-3 service. Don't hesitate to contact us if you are interested.

Here is an example of automatic access using the wget command:   wget -O Madrid_HChourDNI_15to31Aug2014.csv "http://www.soda-is.com/pub/hc3v5_request.php?geopoint=40.4,-3.68&elevation=-999...

More information on the automatic access to HelioClim-3