Download CAMS radiation data over Africa "JADE"  -  

Last update: Dec 2019

    volume of data - maps - Access to AGATE volume (Europe)

 

Volume of data (AFRICA)

As the 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. 2019"

In brief
  • Radiation components:
    • Global Horizontal Irradiation (GHI): ghi_20XX.h5
    • Beam (direct) Horizontal Irradiation (BHI): bhi_20XX.h5
    • Diffuse Horizontal Irradiation (DHI): dhi_20XX.h5
    • Beam (Direct) Normal Irradiation (BNI): bni_20XX.h5
    • Global Horizontal Irradiation in clear sky conditions (Gc): gc_20XX.h5
    • Beam (direct) Horizontal Irradiation in clear sky conditions (BHI): bc_20XX.h5
    • Diffuse Horizontal Irradiation in clear sky conditions (DHI): dc_20XX.h5
    • Beam (Direct) Normal Irradiation in clear sky conditions (BNI): bnc_20XX.h5
  • Time step: 15 minute
  • Temporal period: 2005 to 2018
  • Format: hdf5
  • 1 hdf5 file per year and per component

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 35040 maps, which corresponds to the number of 15 min periods in 1 year (35136 maps for 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 hdf5 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

More info on JADE data - Access to AGATE volume (Europe)

Radiation Component DOWNLOADS MONTHLY AVERAGED
over 2005-2016
YEARLY AVERAGED
over 2005-2016

JADE GHI

Global Horizontal Irradiation

 

Download zip-compressed yearly and monthly averaged GHI maps

*How to visualise these uint16 Geotiff images

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

*How to visualise these uint16 Geotiff images

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

*How to visualise these uint16 Geotiff images

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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