[Talk-GB] 'historic' county boundaries added to the database
Dave F
davefoxfac63 at btinternet.com
Wed Aug 8 11:59:17 UTC 2018
On 08/08/2018 12:05, Lester Caine wrote:
> On 08/08/18 10:56, Dave F wrote:
>>
>> On 08/08/2018 09:54, Lester Caine wrote:
>>> we are now in a situation where much accurately mapped material is
>>> simply dumped when there is a change to the current situation.
>> 1. it's not dumped, it's still in the database as a historic version.
>> 2. Changes almost always increase the accuracy & detail of the database.
>
> Going back through the change logs is not the easiest process?
Overpass API QL language offers means to do it using version() & a
couple of other commands
> Isolating deletions that are due to historic changes rather than
> simple factual corrections also muddies the water. But making the link
> to OHM more organised would allow current valid data to be archived
> properly?
It's possible to upload using JOSM, I believe (haven't used it), but I
agree, a more open gateway for transferring would be useful.
>
>>> The 'delete' process should be handled in a manor more sensitive to
>>> the hard work that has gone before!
>>>
>>> the vast majority of the material making up the historic data such
>>> as boundaries IS the same as the current 'live' data.
>>
>> I'm unsure that's true, but if it were, why duplicate?
>
> That was always my argument AGAINST OHM ... since much of the data
> making up boundaries has not changed, having to duplicate that
> information over to OHM, and then decide where material is current or
> historic means that IDEALLY OHM is a complete copy of the OSM
> database, but with the historic material easier to find than via
> change sets ... why not just manage a single database? People who
> don't want access to historic material simply ignore data which has
> 'expired' via end_date.
How often do you believe people will actually want historic data?
Organizations archive for a reason. Consider your house, how things you
don't use will get shoved to the back of the cupboard/shed.
I live in a Roman city, the editors struggle to display current data.
Imagine what it would be like if *everything* was shown back to the days
of Emperor Nero.
Cheers
DaveF
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