Drifts 04: Analysis of differences between one barometer and many others (improved)

[DavorJ]

This is an improved version of #48:

• added real air-pressure timeseries on top for comparison.
• we only consider 1 barometer instead of location which can have multiple barometers.
• we truncate timestamps to the closest 00h (midnight) or 12h (noon). If multiple timestamps are available, then the average is taken. This allows better comparison by timestamp.

Again, the red curve is the only relevant one and should be stationary. Some highlights:

All plots are available here or here.

[fredericpiesschaert]

What is the source of the real air-pressure timeseries? So each timeseries is compared to that same series, is that correct?