[openstreetmap/openstreetmap-website] add optional coordinate epoch to nodes (#3203)

[Tom Hughes]

Right but I don't see how it helps unless data is normalised - so I download an area and I get a whole load of objects that were added at different times from different sources.

Now even if all those objects have a date attached how does it practically help me edit?

Not to mention that two different imagery sources might be different at the same date - in fact newer dated imagery from a different source might be less accurate.

So without knowing the source as well the date tells me nothing useful.

You whole scheme is predicated on the fact that you happen to have very good imagery so you can assume it's perfectly aligned and shift data to normalise position based on date, but it seems to me that is very specific to your use case, yet you want to change the whole world on the assumption that is either true everywhere already or will be in due course.

It may be true that, in general and on average, things will get better over time but there's no guarantee that different providers will get better at the same rate, or will be starting from the same place so once you're comparing across different providers a date alone is not useful.

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