Helioclim-3 Archives - Web service USAGE

    Inputs - Outputs

Last update: Sept. 2018

               

Back to Web service for free >>
Feb. 2004-2006

Back to Web service for pay >>
Feb. 2004 onwards


    HelioClim-3 database provides from 1 min up to monthly time series of all the radiation components over the horizontal, fix-tilted and normal plane for the actual weather conditions. The Web service for free provides data from Feb. 2004 up to Dec. 2006, while the Web service restricted to registered users who purchased an annual subscription to HC3 can retrieve data up to yesterday.

For more information, see:

INPUTS

  • HelioClim-3 version: the most recent versions are version 4 (available at d-1 and in real time) and version 5 (d-2). More information on the HelioClim-3 versions.
  • Add Meteo Data: include (or not) meteo data in the output CSV file. When this option is selected, the unified output format is automatically selected. MERRA-2 data will be provided from 2004 up to approx. a month ago, and GFS afterwards.
  • Latitude and longitude: enter the values in decimal degrees (we advise 3 or 4 digits after comma), 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.
  • Altitude: enter the altitude, or let us use our default high resolution elevation database SRTM (spatial resolution 90 m, uncertainty 10 m) by letting the default "Automatic" value.
  • Start date and End date: format yyyy-mm-dd.
    NB: 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: "1 min", "5 min", "10 min", "15 min", "30 min", "hour", "day", "week", or "month". NB: "1 min" and "5 min" time steps are limited to one month of data per delivery.
  • Time reference: UT or TST. More information on time references
  • Compute relief shadows: take into account (or not) the shadowing effect due to the far horizon.
  • Plane mode: "Horizontal Plane", "Fixed tilted plane", "2D Sun Tracking (DNI)", "1D Sun Tracking (North-South axis)", "1D Sun Tracking (East-West axis)", "1D Sun Tracking (Tilt tracking)", "1D Sun Tracking (Azimuth tracking)". For more details on how to set the tilt, azimuth and albedo parameters, please take a look to the plane mode table available below.
    If you need more information on the radiation components you need, please refer to the illustrations about plane orientations and radiation components. Please check also the azimuth convention adopted by SoDa
  • Output format: Classic CSV Format or Unified (recommanded!) CSV Format More information on outputs

 

Plane mode               

(More information on plane orientations and radiation components)  

         Plane mode Tilt (degrees) Azimuth (degrees) Albedo Animations
June 21st Dec. 21st
Horizontal Plane 0 NA NA See animated GIF See animated GIF
Fixed tilted plane <user setting> <user setting> <user setting> See animated GIF See animated GIF
2D Sun Tracking (DNI) Sun Tracking Sun Tracking <user setting> See animated GIF See animated GIF
1D Sun Tracking (North-South axis) Sun Tracking 90° or 270° <user setting> See animated GIF See animated GIF
1D Sun Tracking (East-West axis) Sun Tracking 0° or 180° <user setting> See animated GIF See animated GIF
1D Sun Tracking (Tilt tracking) Sun Tracking <user setting> <user setting> See animated GIF See animated GIF
1D Sun Tracking (Azimuth tracking) <user setting> Sun Tracking <user setting> See animated GIF See animated GIF

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Azimuth convention adopted by SoDa

Firstly, the azimuth convention is:

   Azimuth (degrees) Orientation
North
90° East
180° South
270° West
    

So orientation checking is :

  • A tilted plane is north oriented if azimuth < 90° or azimuth > 270°
  • A tilted plane is south oriented if azimuth > 90° and azimuth < 270°

NB: A plane which is not facing the sun might either be a human error, or may also be due to infrastructure or environmental needs (e.g. part of the rooftop north oriented).

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OUTPUTS

  • Launch: push the "process" button, wait a while and right-click on the appeared link to retrieve your file.
  • Output formats: "Classic CSV" or "Unified CSV Format"
  • Missing data: -999
  • "End of interval" integration hypothesis: the integration hypothesis e.g. hourly data at 11:00 means data averaged over 10:00 to 11:00. Please note that all data in SoDa are integrated on the given interval, i.e. irradiances are average irradiances on the given interval, and irradiations are the sum of all irradiations on the given interval. Other database such as CM-SAF SARAH provides instantaneous values at the exact time of acquisition of each pixel in the image (this means that each pixel has a different acquisition time).

  "Classic CSV"

This format is obsolete and won't be maintained since the number and content of the columns change depending on the plane orientation and the time step. Take a look to the column description of "Classic CSV".

  "Unified CSV Format"

This format is simpler which Excel can read seamlessly. It aims at being identical whatever the time step. The consequence is that you can only have two different output columns content: one for horizontal, and another one for all other plane options (fix-tilted, tracking).
NB: When "+ Add meteo data" is selected, new Unified CSV Format is automatically selected.

Horizontal

  1. Date: format yyyy-mm-dd
  2. Time: format HH:MM (no decimal anymore)
  3. Global Horizontal irradiation over the period in Wh/m² (-999 if no data)
  4. Clear-Sky: Irradiation over the period if the sky were clear in Wh/m²
  5. Top of Atmosphere: Irradiation over the period at the top of the atmosphere (extraterrestrial) in Wh/m² computed from Solar Geometry 1
  6. The reliability column has several forms depending of the time step:
    1. Code: 0: no data, 1: sun below horizon, 2: satellite assessment, 5: interpolation in time, 6: forecast
    2. Nb slots (%): ratio of the number of valid slots and the number of slots during the daylength in percent
    3. Nb valid days: number of valid days in the period

Other plane options (fix-tilted, tracking)

  1. Date: format YYYY/MM/DD
  2. Time: format HH:MM (no decimal anymore)
  3. Direct Inclined: irradiation over the period in Wh/m² (-999 if no data)
  4. Diffuse Inclined irradiation over the period in Wh/m² (-999 if no data)
  5. Reflected inclined irradiation over the period in Wh/m² (-999 if no data)
  6. Global Inclined irradiation over the period in Wh/m² (-999 if no data)
  7. Direct Horizontal irradiation over the period in Wh/m² (-999 if no data)
  8. Diffuse Horizontal irradiation over the period in Wh/m² (-999 if no data)
  9. Global Horizontal irradiation over the period in Wh/m² (-999 if no data)
  10. Clear-Sky: Irradiation over the period if the sky were clear in Wh/m²
  11. Top of Atmosphere: Irradiation over the period at the top of the atmosphere (extraterrestrial) in Wh/m² computed from Solar Geometry 1
  12. The reliability column has several forms depending of the time step:
    1. Code: 0: no data, 1: sun below horizon, 2: satellite assessment, 5: interpolation in time, 6: forecast
    2. Nb slots (%): ratio of the number of valid slots and the number of slots during the daylength in percent
    3. Nb valid days: number of valid days in the period

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