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Data Questions

Resolution

What is the spatial resolution of the POWER data?
  • Solar: The data are available in their original source spatial resolution.
  • Meteorology: The data are available in their original source spatial resolution.
What is the temporal resolution of the POWER data?
  • Solar: The data was initially produced on 3-hourly time increments which are averaged to provide daily values. The daily averaged values are used to calculate climatologically averaged monthly values.
  • Meteorology: The data was initially produced on 1-hourly time increments which are averaged to provided daily values. The daily averaged values are used to calculate climatologically averaged monthly values.

Sources

Where is the POWER data derived?

The POWER solar data are inferred via radiative transfer models from satellite observations.

Specific time periods associated with each project are listed in the Methodology: Data Sources Page.

Access

What are the different ways to access the POWER data?

The POWER Data Archive can be downloaded as daily time series analysis ready data files or as climatologically monthly averaged values. For more information on the way the POWER Data Archive data is distributed to the public see the POWER Data Services.

Quality

What is the accuracy of the POWER solar and/or meteorology data?

The accuracy of both the solar and meteorology data are evaluated through direct comparisons with surface site observations. Results from the comparisons are documented in the POWER Methodology.

Why is the elevation given for the POWER data different from the surface station values?

The POWER data, including the elevation value, represent average values over their original source spatial resolution. In complex terrain, such as mountains, the averaged elevation of the grid cell can be substantially different from the local elevation of a local surface site.

What does the provided timestamp represent?

For hourly data, the timestamp notes the last day for which data was provided; it includes all 24 hours of the requested date.

Latency

What are the latency times for POWER data?

Collectively the POWER Data Archive consists of a 2-3 day latency for meteorological parameters and a 5-7 days for latency for solar parameters. For the current status of latency please see the POWER Services Status Dashboard.