[OHM] evolving road classifications & OHM

[Richard Welty]

On 1/7/20 9:14 PM, Rob H Warren wrote:
> 
>>> Richard,
>>> You know the OSM data model does not deal well with change and has poor (geometry<>feature<>label) separation. My suggestion is that since the roadway has not changed significantly, have the geometry encoded as a series of nodes that get allocated to different temporal ways for the different "features" of that route over time. It is not a great solution but it works and is compatible with the renderers. The properties of roadways (width, etc...) are encoded at the way levels in OSM which lets you reuse the OSM highway tagging system.
>>
>> based on my experiences in the past with JOSM, i think such an approach
>> would be pretty error prone and difficult. over on Slack, Leon Karcher
>> suggested tagging the single way with its most appropriate recent tags
>> and using relations for the older one.
> 
> I don't believe that the relations will covey the state / properties of the road as a way would.

not sure i understand. Leon Karcher gave this example over on slack,
which seems like it works to me:

https://openhistoricalmap.org/way/198180780

my concern comes from my experience back in 2009-10 when fixing screw
ups from the TIGER 2007 import was a think; teasing out duplicate ways
in JOSM was a pain in the ass, and i don't think anything has happened
in the intervening 10 years that improves anything. it will be error
prone and fussy unless editing tools improve.

>> way way back in 2015, this section of the OHM wiki page got set up: https://wiki.openstreetmap.org/wiki/Open_Historical_Map#Short-term_plans the link to OHM/Tags was never filled in in the 4+ years since. i think it's high time we started describing how people are tagging to reflect historic features and dating. i certainly am working through a lot with my stuff, and the method Leon is using could certainly go in as well, as examples of experiments as this is largly experimental at this time.
> 
> I've checked, the page isn't locked. Why don't you start documenting how you are tagging roads?

it had been locked, someone must have changed that.

richard
-- 
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