Erik,
Yes, the life cycle would mean the repetition of ways, through we can
probably get away with recycling the nodes. It's not ideal, but it's
pretty much the only way to get things to record change properly given
the data structure we have to work with.
My thinking so far is that more encoding is better than less.
On 17-May-13, at 8:00 AM, [email protected] wrote:
Message: 4
Date: Thu, 16 May 2013 18:02:38 +0200
From: Erik Johansson <[email protected]>
To: Robert Warren <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [OHM] temporal data in the OHM sandbox
Message-ID:
<CAKs=k7qrd+ic3cmqh_np9fcxjyu8-sdg-wr2sq9zk61gcuq...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I don't know if you use life_cycle=* wouldn't that mean you have to
create a new building every time you want to change the buildings
use. That would mean a need to track things like "this is way #####2
the same building as in the deleted way #####1"
The suggestion further down on that page seems to be more like what
I'm about to do.
http://wiki.openstreetmap.org/wiki/Comparison_of_life_cycle_concepts#Related_concepts
On Thu, May 16, 2013 at 4:41 PM, Robert Warren
<[email protected]> wrote:
Erik,
I've been using the start and end dates as well. I would prefer we
use something like life_cycle [1] for structure status since this
will better track what structure is in what state. Today's ruins
are yesterday's town hall.
Rendering is something we still need to work on. Suggest more
tagging data is better than less tagging data - it's easier to
delete superfluous data later rather than re-creating it.
rhw
[1]
http://wiki.openstreetmap.org/wiki/Comparison_of_life_cycle_concepts#life_cycle_.3D_.3Cstatus.3E
On 2013-05-16, at 8:00 AM, [email protected] wrote:
Message: 3
Date: Wed, 15 May 2013 23:55:57 +0200
From: Erik Johansson <[email protected]>
To: Marcus Koenig <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [OHM] temporal data in the OHM sandbox
Message-ID:
<CAKs=k7q9zvx8a9d1ky6mboq+xy2grdfphq9mqb9vrfnpkjn...@mail.gmail.com
>
Content-Type: text/plain; charset=ISO-8859-1
Hi Marcus.
I don't know how other people use it, and I've not uploaded my data
because of many small problems with historic mapping. But I have a
handfull of historic buildings in Stockholm that I will upload
sometime in the future.
For the buildings I use
start_date=1790
end_date=1810
http://wiki.openstreetmap.org/wiki/Key:start_date
I also use free form tagging, these need to be more formal.
note="just gone from map"
note="demolished"
note="burned down"
I do not map changes to the buildings, e.g.
* reconstructions and additions.
* church => night club
* relocations
I've tried to map name changes, But it's clunky.
name:1790="Fr?mans krog"
I find it hard to verify facts, I should have added source on every
feature I mapped, I've tried source=, but these tags are sometimes
out
of sync with the data.
source="map xx from 1624"
source:url=*
It will probably take a while before I upload/share my meager data
collection, mostly because of it being hard work with all sources,
projections and unexplained peculiarities.
I have no renderers for the data yet, except some manual one year
snapshot with either JOSM or postgres + openlayers.
On Wed, May 15, 2013 at 6:50 PM, Marcus Koenig <[email protected]
> wrote:
Hi,
I'm very interested in the OHM project and I would like to
contribute data
for Mainz, Germany. In the long run I would like to create a map
of the city
before the destructions during WW2, but also of earlier periods.
I have had
a look at the OHM Sandbox, but I couldn't find out where the time
dimension
comes in. How do you tag and display temporal information? The
map would
have to change with time settings - eventually? I'd really
appreciate if
anyone could give me a short insight into the current state of
the project.
Best regards
Marcus K?nig
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