When using the "OS Open Background" service in ArcGIS 10.3 alongside some OS Local vector data, I noticed that when zoomed in they align perfectly (see first image). However, when zoomed further out they appear to be out of alignment (see second image - the dark grey line should be under the red line). Can anyone explain to my what is the cause for this?
I had a response from ESRI (via Twitter) but I don't understand: "This is due to the reference scale of the different products at the different scales. Strategi data is very generalised (as a product to display at that scale needs to be) and so it causes these discrepancies."
I could understand if it was the other way around, i.e. looking OK at smaller scales, but zooming in showing a small difference. But it's the other way around.