Hello,
I like the python-style for the time range definition and this style
don't break with OSM-rule of unique keys for each object.
What we should additionally handle is to work with uncertainties.
So in my mind there are different kinds of sources:
*If we found documents with the exact year it's easy:
name:[year1:year2]
*If we find only two historical maps with a streetname and I know when
these maps were printed. I know that the street got the name before the
first map was printed and had this name also after the second, younger map.
(Problem is that changes need in the past some years to come to a map,
also today it can need a while). In such a case I would propose to use:
name:[<year1:>year2]
*If a street has the name from a person, it's mostly so that the street
didn't get the name before the person was born. In our example Emperor
Wilhelm I. was born 1797. So I would say:
name:[>1797:1936]=Emperor-Wilhelm-Street
Perhaps somebody comes later with a map that shows that the complete
street didn't exist at this time. So I hope we find a system that
becomes better and better over time with the help of many users without
to be perfect at the first day.
As standard for time we should reference at ISO 8601, so if people know
it exactly they would be able to use YYYY-MM-DD instead of YYYY.
To make it not to complicated, I hope the gregorian calendar is ok.
Greetings Tim
Am 22.01.2013 19:55, schrieb 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 <[email protected]
<mailto:[email protected]>>
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 <[email protected].__de
<mailto:[email protected]>>
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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