Standard Time Step Alignment

When Windographer resamples datasets for time-step-by-time-step comparison, to ensure aligned time steps it anchors all time series to 1900-01-01 00:00. If you choose a time step length of 30 days, for example, then Windographer will align those time steps so that if they stretched all the way back to the year 1900, then 1900-01-01 00:00 would fall on a time step boundary.

A two-week dataset covering the last half of October 2021 would fall into two such time steps, as shown below:

A two-week dataset covering the first half of October 2021 would fall into a single such time step:

A two-week dataset covering the last week of September 2021 and the first week of October 2021 would fall into a two such time steps:

As the above examples demonstrate, a dataset's period of record has no effect on the alignment of standard-aligned time steps. The fixed anchor date of 1900-01-01 00:00 and the length of time step are the two factors that determine the alignment of the time steps. A dataset's period of record determines the standard-aligned time steps into which it falls, but it does not affect the alignment of the time steps.