Hello,
I would like to understand how exactly time-dependent transformations work in ArcGIS Pro - in relation between the reference map and to the actual dataset in order to identify good data management/handling practices.
Quick background info: Both WGS84 (ITRF2014) and ETRS89 (ETRF2000) are going to be used for a project, which means when transforming data between the two CRS, custom transformation parameters need to be applied as per the corresponding epoch of the data acquisition/creation.
So I was wondering - which of the following ways is going to work (if none) and which one is the best way of doing it:
1. Applying the Custom Transformation to the datasets themselves with the help of the Project tool, while leaving standard transformation in Map Properties (ETRS 1989 to WGS 1984) or no transformation at all if Map already set in the correct Datum.
2. Applying standard transformation to the datasets (ETRS 1989 to WGS 1984) using the project tool and specifying the Custom Transformation in the Map Properties.
3. Applying custom transformation in both the dataset and in the Map Properties.
From my current understanding the best practice is number 1, as the second will result to positioning slivers and shifts when more than one custom epoch is being used, while number 3 is like applying the custom transformation twice - which will result to errors.
Please let me if you agree with this assumption, or if there is something I am missing, and/or you would like to add something on that.
Thank you very much in advance and looking forward to your replies!
Best,
M.
