Last update: June 2017

As the two datasets are too large to be permanently placed on the SoDa server, please so that we can make the data available for a short period.

Copyright: please refer to this volume as "CAMS radiation service dataset "Agate" over Europe - CAMS projet - August 2016".

Description of the volume

1_ Introduction

• Name of the volume: "Agate"
• Datasets: ghi.h5.7z and gc.h5.7z which respectively stands for the Global Horizontal Irradiation (GHI) and GHI in clear sky conditions (Gc), 7-Zip compressed HDF5 files (Download the free tool 7-Zip for Windows)
• 15 minute GHI and Gc from 2005 to 2015

2_ Grid description

We used a 275 * 126 grid of points over Europe with a 0.2 degree step. Only grid cells on land were computed. Download the list of the 275*126 grid points in CSV format.

The grid bounding box and step are (in degrees):

 lat_min =  34.9° lat_max =  60.1° lon_min = -10.3° lon_max =  44.7° grid_step = 0.2°

Thus 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)

3_ Map content

Each dataset comprises 385632 maps. 385632 is the number of 15 min periods from 2005-01-01 to 2015-12-31: 96 periods per day * 365 days * 11 years + 96 * 2 days (for 2008 and 2012 leap years).

 Each value in ghi.h5 and gc.h5 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. For example, take a look to the image on the right, corresponding to GHI on 2005-04-01 from 11h45 to 12h00 UT

If you extract ghi.h5 data as a time series for one location, you will get the same data as CAMS Radiation web interface at http://www.soda-pro.com/web-services/radiation/cams-radiation-service

For example, CAMS_Radiation_GHI_at_point_300_on_2005-01-10.jpg compares CAMS Radiation GHI on 2005-01-10 at location (57.4, -2.4) extracted from the web interface and from ghi.h5. Note: you will notice a small difference which is due to the data compression as 1 byte per value in ghi.h5.