CAMS radiation service - overview
|Last update: Oct. 2016|
|CAMS RADIATION SERVICE IDENTITY CARD|
|Type of ressource||Online solar radiation satellite-derived database|
|Access||FREE: via the SoDa website / automatic (WPS, limited to 5 requests per day)|
|Provider||ECMWF / MINES ParisTech / ARMINES / TRANSVALOR S.A.|
|Parameters||All radiation components over the horizontal plane and the Direct Normal component|
|Spatial coverage|| |
|Temporal coverage||1st Feb. 2004 onwards (available at d-2)|
|Spatial resolution||3 km at Nadir, approx. 5 km in Europe (see illustration above)|
|Temporal resolution||15 min|
|Leadtime||available at d-2|
|Main publication||Qu et al. 2016 (others: see publications with keyword "Heliosat-4")|
No correction in altitude "on the fly" using a post-processing layer as in HelioClim-3.
No possibility to get irradiation values taking into account the shadowing effect due to the far horizon.
NB: The reliability variable is computed with respect to the amount of 1 minute resolution time slots of the current time slot (15 min or 1 hour) without cloud information. In the morning and evening, for very low sun elevation angles, the APOLLO cloud computation gives no results, and this explains the value lower than 1 for the first/last 15 min (or 1 hour) slot in the morning/evening. During the day, it happens from time to time that the cloud information cannot be computed for a given satellite images set and this also creates a lower reliability value (this can be cause by a problem in the satellite images reception or in the APOLLO computing process - CAMS radiation is still a bit "experimental"). Thus, in summary, the reliability value gives an idea of the amount of interpolated data for the time slot of interest.