In case of solar and PV time series we use satellite data since available history up to present moment plus additional 4-5 hours ahead (in the regions where real time & nowcasting model is available). Satellite data includes historical (archived) data, operational data, real-time and nowcasting data. Historical data spans up to the last completed calendar month and can be considered as "definitive". Data in current calendar month up to DAY-1 is "operational" and will be re-analysed in the next month using final data inputs. Important to note is that differences introduced with every update is typically small. Data in current day are from "real-time" satellite model and will be updated when day finishesis finished. Then, based on last satellite scenes we predict cloud motion in period in next 4-5 hours ("nowcasting"). The present moment and short period before is covered by "the nowcasting " model data as the last satellite scene is still in progress. This delay can take up to 30 minutes (depends on satellite scan frequency). After Later on after nowcasting period , we use post-processed outputs from Numerical Weather Prediction models (NWP). Satellite based data is seamlessly integrated with NWP forecasting data within one response. In case of locations where real-time & nowcasting data is not available, NWP data is used for the whole current day. Also, not every location is supplied by ECMWF IFS data. In such case NOAA GFS data is used for all forecasted values. Meteorological data (TEMP, WS, AP, RH...) is comprised of NWP modeled data.
Spatial coverage of data available through API (valid for Oct 2016), click map Nov 2017). Click image to enlarge:
Light orange Orange regions on the map are accessible via API and data is regularly updated. In the subset of these regions, the real-time & nowcasting data (for DAY+0) may be are available (green outlines). Main data parameters include GHI, DNI, DIF, GTI, PVOUT.
|satellite region||data since||operational data update|
original satellite scan frequency
|GOES-E||1999-01-01||every day at 10:00 UTC (USA), 13:00 UTC (whole region)||planned||30 minutes|
|PRIME MFG/+MSG PRIME||2005-01-01||every day at 03:45 UTC||part of Europe and Kenya||15 minutes|
|MTSAT/+HIMAWARI||2006-07-01||every day at 22:40 UTC|
10-min resolution, update frequency 30min, 0-5 hours ahead
|30 min. (10 min. since Jan 2016 onwards)|
|IODC MFG/+MSG IODC||1999-01-01||every day at 22:40 UTC||15-min resolution, update frequency 30min, 0-5 hours ahead||30 min. (15 min. since Feb 2017 onwards)|