I'm trying to understand how irradiance data (and other weather metrics) are derived at each timestamp in typical datasets. Specifically:
Data Generation Method:
Are these values obtained through instantaneous interpolation of meteorological source data (e.g., satellite/station measurements), or are they averaged over surrounding time windows?
Temporal Directionality:
For averaged data, does the calculation use only preceding data (causal), succeeding data (non-causal), or both?
Are there fundamental methodological differences between historical data and forecasting data?
