Download CAMS radiation data over Africa "JADE"  -  

 Last update: May. 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 2
 
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 2017
  • 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 455808 maps, which corresponds to the number of 15 min periods from 2005-01-01 to 2017-12-31.

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
Routines to extract entire or part of JADE

 

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Africa maps "JADE" of CAMS radiation data and CAMS McClear

Geotiff uint16 20 km maps - More info on JADE data

Radiation Component DOWNLOADS MONTHLY AVERAGED
over 2005-2017		 YEARLY AVERAGED
over 2005-2017

JADE GHI

Global Horizontal Irradiation

 

Download zip-compressed yearly and monthly averaged GHI maps

To cite these data:

© ARMINES / MINES ParisTech / TRANSVALOR /  ECMWF - COPERNICUS Atmosphere Monitoring Service – Monthly and yearly average Global Horizontal Irradiation maps from CAMS Radiation Service over Africa – "JADE" volume – April 2018
Click to maximize
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JADE Gc

Global Horizontal Irradiation in cloud-free conditions

Download zip-compressed yearly and monthly averaged Gc maps

To cite these data:

© ARMINES / MINES ParisTech / TRANSVALOR /  ECMWF - COPERNICUS Atmosphere Monitoring Service – Monthly and yearly average Global Horizontal Irradiation maps in cloud-free conditions from CAMS McClear over Africa – "JADE" volume – April 2018
Click to maximize
Click to maximize

JADE BNI

Direct Normal Irradiation

Download zip-compressed yearly and monthly averaged BNI maps

To cite these data:

© ARMINES / MINES ParisTech / TRANSVALOR /  ECMWF - COPERNICUS Atmosphere Monitoring Service – Monthly and yearly average Direct Normal Irradiation maps from CAMS Radiation Service over Africa – "JADE" volume – April 2018
Click to maximize
Click to maximize

 

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