Download CAMS radiation data over Africa "JADE"  -  

Last update: Apr. 2018

    volume of data - maps

Volume of data


As the eight files are too large to be permanently placed on the SoDa server, please contact us so that we can make the data available for a short time period.

Copyright: please refer to this volume as "CAMS radiation service dataset "JADE" over Africa computed with McClear version 3 and CAMS radiation bias correction - CAMS project - Dec. 2017"

Downloads 1

 

 

In brief
  • Radiation components:
    • Global Horizontal Irradiation (GHI): ghi.h5
    • Beam (direct) Horizontal Irradiation (BHI): bhi.h5
    • Diffuse Horizontal Irradiation (DHI): dhi.h5
    • Beam (Direct) Normal Irradiation (BNI): bni.h5
    • Global Horizontal Irradiation in clear sky conditions (Gc): gc.h5
    • Beam (direct) Horizontal Irradiation in clear sky conditions (BHI): bc.h5
    • Diffuse Horizontal Irradiation in clear sky conditions (DHI): dc.h5
    • Beam (Direct) Normal Irradiation in clear sky conditions (BNI): bnc.h5
  • Time step: 15 minute
  • Temporal period: 2005 to 2016
  • Format: hdf5
  • 7z compressed

Click on the image to magnify

 
Grid description

We used a nb_lines*nb_columns = 385*370 points over Africa with a 0.2° step. Only grid cells on land were computed.

  • grid_step = 0.2°
  • minimum longitude: -20°
  • minimum latitude: -37°
  • maximum longitude: 54°
  • maximum latitude: 40°

NB: the formula to convert (lat, lon) into grid cell is:

  • x = round((lon - lon_min)/grid_step + 0.5)
  • y = round((lat_max - lat)/grid_step + 0.5)
Volume content

Each HDF5 dataset comprises 420768 maps. 420768 is the number of 15 min periods from 2005-01-01 to 2016-12-31: 96 periods per day * 365 days * 12 years + 96 * 3 days (for 2008, 2012 and 2016 leap years).

Each value in HDF5 files is stored as an unsigned byte:

  • The value 255 denotes a grid cell over the sea (not computed)
  • The value 254 means a computation error
  • Else, the value should be multiplied by 1.2 to get the 15 min GHI irradiation in Wh/m².

If you extract ghi.h5 data as a time series for one location, you will get almost the same data as CAMS Radiation web interface. The small difference is due to the data compression as 1 byte per value in JADE.



Click on the image to magnify: GHI on 2005-04-01 from 11h45 to 12h00 UT

 

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Africa maps "JADE" of CAMS radiation data

Geotiff uint16 20 km maps - More info on JADE data

JADE GHI

Global Horizontal Irradiation

 

Download zip-compressed yearly and monthly averaged GHI maps


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JADE Gc

Global Horizontal Irradiation in clear-sky conditions

Download zip-compressed yearly and monthly averaged Gc maps
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JADE BNI

Direct Normal Irradiation

Download zip-compressed yearly and monthly averaged BNI maps
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