How to get the interpolation data using aggregate method

GPA Products openHistorian
1

we want to get the interpolation value,it not the raw value, we can’t find the sdk method to do it, please help us, thanks!

2

I don’t understand what you mean. Interpolation and aggregation are two separate analyses, and I don’t believe that one can be used to achieve the other. Can you clarify? Also, what SDK are you using?

3

Sorry,

If we have three raw data as below:

Tag1 1:00:00 value:10

Tag1 1:00:10 value:20

Tag1 1:00:30 value:50

We want to get the interpolate date on the time 1:00:05 and 1:00:18 ,

how to get the interpolation data quickly from openhistorian?

4

It really depends on what type of interpolation you’d like to perform. The openHistorian doesn’t natively support interpolation, but you can do a query over a time range and run an interpolation algorithm over the result. This would be easy enough using C# source code.

GSF provides some curve fitting functions in the GSF.NumericalAnalysis namespace.
https://github.com/GridProtectionAlliance/gsf/tree/master/Source/Libraries/GSF.Core/NumericalAnalysis

You can also use a math library such as Math.NET which provides functions for different types of interpolation.