[OSM-talk] Request for Romano-British features

John F. Eldredge john at jfeldredge.com
Tue Jan 3 02:11:49 GMT 2012


Graham Jones <grahamjones139 at gmail.com> wrote:

> On 2 January 2012 15:47, Lester Caine <lester at lsces.co.uk> wrote:
> 
> > Historic mapping wiki page has yet to be created, but start_date and
> > end_date would seem to replace the need for Key:historic:period if
> accurate
> > data is available.
> >
> I think the issue is availability of accurate data - I am pretty
> confident
> that I can look at a building and think it is Tudor, or a fortress and
> guess that it is Nepoleonic, but guessing the date seem somehow harder
> to
> me.
> I would like the tagging to be accessible to non-history buffs, so
> more
> qualitative categories would seem easier than trying to be too
> precise.  By
> all means include start_date if it is known though!
> 
> >
> > Having been watching a program recently on the development of
> various
> > industrial areas of the UK, it would seem that there is substantial
> data
> > available to provide historic maps. Development and decline of the
> railway
> > system for example is something I've been gathering historic maps
> that
> > provides considerable accurate timelines.
> >
> I like this sort of thing too, which is why we will need more
> categories
> than currently proposed 'modern' is too wide given all the changes in
> the
> 20th Century.
> 
> 
> > The only question that still has not been addressed is one that
> covers a
> > lot of parallel data. SHOULD it be uploaded to the main database, or
> should
> > we have a working method for linking secondary databases into the
> rendering
> > process. Which to my mind still provides the most logical way
> forward. But
> > at what point does an historic element get degraded to the secondary
> > storage area? Or more important ... what classifies historic data as
> being
> > 'main stream'?
> >
> > My view is that if it is something that is still there on the ground
> (e.g.
> the ruins of an old tin mine), then it should go in the main database.
>   If
> there is nothing physically to see, it belongs in a specialist
> historic
> map. I haven't thought about how to make this separate map though....
>
As far as rendering is concerned, it would be useful to be able to set starting and ending dates for a given renderiing, so that eventually you compare a series of maps and see patterns of changes.  In some cases, you might want to show only the time period of interest; in other cases, you might want to show both historic data and current-day data.

-- 
John F. Eldredge --  john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria



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