Admin boundaries are a slightly different thing - they may be intangible
on the ground, but they are also current. We don't keep historical
versions of admin boundaries either
The problem with the historical thing is that to my mind, it is a
slippery slope. There's a park near me that is currently, well, a park.
But I know that it was previously a quarry, and then a rubbish
tip/landfill, cos there is a sign saying so. But I certainly wouldn't
tag the parks as a quarry or landfill, because it isn't. It's a park....
Ditto with historical names. Piera St in East Brunswick was originally
named Nicholas St, and Jenkin St was Baden St in 1936. No idea why they
were changed - confusion with other more major streets nearby I guess -
but there is no sign of the old name on the ground. Yeah - I know there
is a fixed historical name tag I can set, but even then I wonder about
it. It's not like anyone in the street ever called it that (which is
possibly different to something like Whitehorse Road in Nunawading,
which I think is technically now Maroondah Highway, but Whitehorse is
the historical name that is still in use)
What we really need is a better storage model - the simple one we use
just isn't up to the task for this kind of data. It barely copes with
teh actual "on-the-ground" info as it is. Remember segments, anyone?
Matt
On 26/11/2012 1:38 PM, Paul Norman wrote:
From: Alex Sims [mailto:a...@softgrow.com]
Subject: Re: [talk-au] Historical rail lines
On 26/11/2012 10:38 AM, mick wrote:
I'm in two minds about removing 'historical' data.
Yes, objects no longer visible on the ground shouldn't be rendered on
the map.
I've been following this discussion with interest. We do mark and should
mark administrative boundaries which are not visible on the ground. Can
the logic for these boundaries which be usefully extended to historical
data?
The subject of historical rail lines and historical roads came up on the
talk-us@ mailing list relatively recently.
As always, there were multiple views. The result of the discussion was that
the general view is that historic information only belongs in OSM when there
is some trace on the ground.
As a practical matter, historic roads are not generally mapped in OSM.
Whenever a road is physically realigned and the new alignment mapped in OSM
the old alignment is not saved as a separate way. If I survey the area I
only look at how it looks now so I don't know if the old alignment in the
database is because it was aligned that way in the past or because the data
was inaccurate.
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