Compare data over different time ranges on the same trend
As a process engineer, I need to be able to overlay traces on the same trend with data from different time ranges so that I can compare different point in time. This may be the same data item over different time ranges or multiple different data items over different time ranges.
A use case for this:
Operation in summer months is very different to winter months. The ability to trend different time ranges would allow us to compare 2019 to 2018 summer data, on the same trend (user would be able to select June-to-August data from each year).
Also note this "different-time-ranges" feature would really strengthen the analysis capability of PI users if the different-time-ranges can also be applied on an X-Y plot (scatter). The use case is the same, when comparing the scatter of 2019's summer vs 2018's summer you could visualize more easily if there was a shift in the operations data.
Moshe S. commented
The ability to add an offset to the data for a SPECIFIC plotted trace within a Trend of a few plotted traces is crucial to be able to align trends and compare between them.
The end-user should be able to add a positive or negative offset to every trace (HH:MM:SS, or by using PI relative time notations) or drag the trace manually.
Ability to change X-axis of trend lines individually, ie overlap different time periods on the same chart.
Select a trace on a trend and be able to shift the timescale for that trace manually so it is offset from the other traces.