On 20/09/2018 07:24, Frederik Ramm wrote:
Surely your argument which seems to be based on the romantic "Rutland that people feel in their hearts" could not be applied as a reason to store "Rutland County Council District Council in the borders of 1997", plus "Rutland County Council District Council in the borders of 1999", and also "Rutland County Council District Council in the borders of 2003"...?
That people have a desire to view this data is a simple fact. Had the 1997 boundary been drawn at that time, and then update to '1999' and subsequently to '2003' means that this data would have been in the database and as others keep pointing out would be accessible by looking at the change logs. The next changes will also be logged the same way, but ACCESSING the historic views is not an easy process?
The current 'process' dictates that OHM should take over the job of displaying the older versions but there is currently no easy way to carry out that process, and these 'special cases' then have to exist in parallel across both databases. So is there not a good reason to start processing 'start_date' and 'end_date' properly so that an object CAN exist in different configurations over time. Material which has an 'end_date' is ignored by any 'current map' processes in which case a 'special case' historic element would be named as such and not have an end_date ...
Current data will become superseded, and one is then adding the new version, but the old version is still valid data and needs to be handled better than it is currently. If the process is managed properly then adding additional historic data should not be a problem since the vast majority of that data will simply be a 'start_date' for objects that ARE current in the database!
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