[Historic] Temporal Tagging - old names

[Christian Quest]

A couple of weeks ago, I proposed some tagging idea...

The idea is to add a time range to the key part of the tag, example:

The current name is "Place Charles de Gaulle", but until 1970 it was
"Place de l'Etoile" (located on the upper end of Champ Elysée in
Paris).
name[:1970]=Place de l'Etoile
name=Place Charles de Gaulle

A building was a court house until 1927 and is not a shoe shop (at my
street corner):
building=yes
shop=shoes
amenity[1905:1927]=court_house

In your case:

name:[:1936]=Emperor-Wilhelm-Street
name:[1936:1945]=Adolf-Hitler-Street
name:[1945:1990]=Karl-Marx-Street
name:[1990:]=Emperor-Wilhelm-Street
name=Emperor-Wilhelm-Street


This is really a draft, if there is some standardization on date range
syntax (ISO ?) it should be used as much as possible.

The benefit is:
- compatible with current infrastructure: does not create "ghost" rendering
of past data
- no need to change anything in existing databases

To use this additionnal data, you need of course to extract the date range
and store that in your database the way you want and adapt the remaning
tools like rendering style sheets.


Someone also proposed (on the frech forum) to have a syntax on the value
side of the tags like:

old_name=[:1936]Emperor-Wilhelm-Street;[1936:1945]Adolf-Hitler-Street;
[1945:1990]Karl-Marx-Street

But I'm afraid such a syntax will be broken too easily by people not
familiar with historical details on tags.


2013/1/22 Rob Warren <warren at muninn-project.org>

> I agree, the ability to tag items with previous names is desirable. What I
> was thinking is:
>
>  <tag k="old_name" v="Emperor-Wilhelm-Street" end_date="1936"/>
>  <tag k="old_name" v="Adolf-Hitler-Street" start_date ="1936"
> end_date="1945"/>
>  <tag k="old_name" v="Karl-Marx-Street"  start_date ="1945"
> end_date="1990"/>
>  <tag k="old_name" v="Emperor-Wilhelm-Street"  start_date ="1990" />
>
> I realize that this requires a little bit more flexibility / documentation
> on the part of the mappers, but the above makes it perfectly clear to the
> renderer which label to use.
>
> I like the slider idea too.
>
> rhw
>
>  Date: Mon, 21 Jan 2013 19:53:48 +0100
>> From: Tim Alder <tim.alder at s2002.tu-chemnitz.**de<tim.alder at s2002.tu-chemnitz.de>
>> >
>> Subject: Re: [Historic] Temporal Tagging  - old names
>>
>>
>> There is also an other OSM-tag we should keep in mind.
>> I mean key "old_name". We already have more than 50.000 of them in the
>> database[1], but no real documentation for it.
>> What I really miss in this feature is a solution for multiple old names
>> and the time span for it. For example we have in Germany a lot of
>> Streets changed there name in this kind:
>> Emperor-Wilhelm-Street -> Adolf-Hitler-Street -> Karl-Marx-Street (East
>> Germany) -> back to Emperor-Wilhelm-Street
>> (...-1936)->(1936-1945)->(**1945-1990)->(1990-...)
>> For some changes we know exactly when it was but not for all.
>>
>>
>>  (...)
>
>
>> As a vision I see a map with a time-slider and all streets change there
>> names if I move the slider.
>>
>> Greetings Tim alias Kolossos
>>
>> [1]http://taginfo.**openstreetmap.org/keys/old_**name<http://taginfo.openstreetmap.org/keys/old_name>
>>
>
>
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-- 
Christian Quest - OpenStreetMap France -
http://openstreetmap.fr/u/cquest<http://openstreetmap.fr/u/christian-quest>
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