Spectral by SoDa Info

 

  SPECTRAL BY SODA - INFORMATION and web service usage

  Methodology - Inputs - Outputs

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Spectral by SoDa database provides from 15 min up to monthly time series of spectral radiation values computed from McClear weighted Kato combined with broadband HelioClim-3 clear-sky over a horizontal plane.

The demo web service is for free from Feb. 1st, 2004 up to December 31, 2006.

The complete web service for all years up to yesterday is a charged service.

 

For more information, see:

 

 

METHODOLOGY OF THE SERVICE

under construction

 

INPUTS

  • Spectral Band : Ultraviolet (UV, Photosynthetic Active Radiation (PAR) and Kato band interval
  • Kato lower bound : define the first band of Kato band interval
  • Kato upper bound : define the last band of the Kato band interval
  • 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.
  • Compute relief shadows: take into account (or not) the shadowing effect due to the far horizon.
  • 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.
  • Output Format : Comma Separated Value (.csv file)

 

OUTPUTS

  • Launch: push the "process" button, wait a while and right-click on the appeared link to retrieve your file.
  • Output formats: Comma Separated Value (.csv file)
  • 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).

 

UV outputs : 

 

  1. Date: format DD-MM-YYYY
  2. Time: format hh:mm
  3. UVB GHI (Wh/m2): Irradiation in UV-B (280-315 nm) over the period on horizontal plane (-999 if no data or outside MSG coverage)
  4. UVB Gc clear-sky (Wh/m2): Irradiation in UV-B (280-315 nm) over the period on horizontal plane if the sky was clear (-999 if no data)
  5. UVB TOA (Wh/m2): Irradiation in UV-B (280-315 nm) over the period at the Top of the Atmosphere (-999 if no data)
  6. UVA GHI (Wh/m2): Irradiation in UV-A (315-400 nm) over the period on horizontal plane (-999 if no data or outside MSG coverage)
  7. UVA Gc clear-sky (Wh/m2): Irradiation in UV-A (315-400 nm) over the period on horizontal plane if the sky was clear (-999 if no data)
  8. UVA TOA (Wh/m2): Irradiation in UV-A (315-400 nm) over the period at the Top of the Atmosphere (-999 if no data)
  9. UV GHI (Wh/m2): Irradiation in UV (280-400 nm) over the period on horizontal plane (-999 if no data or outside MSG coverage)
  10. UV Gc clear-sky (Wh/m2): Irradiation in UV (280-400 nm) over the period on horizontal plane if the sky was clear (-999 if no data)
  11. UV TOA (Wh/m2): Irradiation in UV (280-400 nm) over the period at the Top of the Atmosphere (-999 if no data)

  12. The reliability column has several forms depending of the time step:

  • Code: 0: no data, 1: sun below horizon, 2: satellite assessment, 5: interpolation in time, 6: forecast
  • Nb slots (%): ratio of the number of valid slots and the number of slots during the daylength in percent
  • Nb valid days: number of valid days in the period

 

PAR outputs : 

 

  1. Date: format DD-MM-YYYY
  2. Time: format hh:mm
  3. PAR GHI (µmol/m2/s): PAR (400-700 nm range) over the period on horizontal plane (-999 if no data or outside MSG coverage)
  4. PAR Gc clear-sky (µmol/m2/s): PAR (400-700 nm range) over the period if the sky was clear (-999 if no data)
  5. PAR TOA (µmol/m2/s): PAR (400-700 nm) over the period at the Top of the Atmosphere (-999 if no data)

  6. The reliability column has several forms depending of the time step:

    • Code: 0: no data, 1: sun below horizon, 2: satellite assessment, 5: interpolation in time, 6: forecast
    • Nb slots (%): ratio of the number of valid slots and the number of slots during the daylength in percent
    • Nb valid days: number of valid days in the period

 

Kato bands outputs : 

 

  1. Date: format DD-MM-YYYY
  2. Time: format hh:mm
  3. Kato[i] (Wh/m2): Irradiation over the period on horizontal plane for the ith Kato band (-999 if no data or outside MSG coverage)
  4. Kato[i] clear-sky (Wh/m2): Irradiation over the period if the sky was clear for the ith Kato band (-999 if no data)
  5. Kato[i] TOA (Wh/m2): Irradiation over the period at the Top of the Atmosphere for the ith Kato band (-999 if no data)

  6. The reliability column has several forms depending of the time step:

    • Code: 0: no data, 1: sun below horizon, 2: satellite assessment, 5: interpolation in time, 6: forecast
    • Nb slots (%): ratio of the number of valid slots and the number of slots during the daylength in percent
    • Nb valid days: number of valid days in the period

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