[OHM] temporal data in the OHM sandbox

[Rob Warren]

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, historic-request at openstreetmap.org wrote:

> Message: 4
> Date: Thu, 16 May 2013 18:02:38 +0200
> From: Erik Johansson <erjohan at gmail.com>
> To: Robert Warren <warren at muninn-project.org>
> Cc: "historic at openstreetmap.org" <historic at openstreetmap.org>
> Subject: Re: [OHM] temporal data in the OHM sandbox
> Message-ID:
> 	<CAKs=k7qrD+ic3cMQH_np9FCxJYU8-SDg-WR2sq9zk61gCUQ37g at 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
> <warren at muninn-project.org> 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, historic-request at openstreetmap.org wrote:
>>
>>>
>>> Message: 3
>>> Date: Wed, 15 May 2013 23:55:57 +0200
>>> From: Erik Johansson <erjohan at gmail.com>
>>> To: Marcus Koenig <einschmelzer at hotmail.com>
>>> Cc: "historic at openstreetmap.org" <historic at openstreetmap.org>
>>> Subject: Re: [OHM] temporal data in the OHM sandbox
>>> Message-ID:
>>>      <CAKs=k7q9Zvx8A9d1kY6MBoq+xy2gRDFphq9MqB9VRfNpkjnQHg at 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 <einschmelzer at hotmail.com 
>>> > 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
>>>>
>>>>
>>>> _______________________________________________
>>>> Historic mailing list
>>>> Historic at openstreetmap.org
>>>> http://lists.openstreetmap.org/listinfo/historic
>>>>
>>>
>>>
>>>
>>> --
>>> /emj
>>
>
>
>
> -- 
> /emj
>