[OHM] evolving road classifications & OHM

[Rob H Warren]

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.

Additionally, you could use relations to link the different ways in a temporal/sequential fashion (eg: nextIncarnation). I've experimented with a similar solution for historical LOD and wikipedia does the same for elements that have multiple incarnations. I don't think that this would break anything in the ecosystem since unknown relations get ignored.

-R

> Message: 1
> Date: Mon, 30 Dec 2019 12:23:31 -0500
> From: Richard Welty <rwelty at averillpark.net>
> To: "historic at openstreetmap.org" <historic at openstreetmap.org>
> Subject: [OHM] evolving road classifications & OHM
> Message-ID: <f9a49f3b-9321-71d4-2671-df7dd73063f6 at averillpark.net>
> Content-Type: text/plain; charset=utf-8
> 
> [i previously posted this over in slack; not a lot of OHM activity
> over there so i'm reposting it here]
> 
> i'm currently entering the route of the Long Island Motor Parkway
> into OHM, both for its historic interest as an early improved roadway
> (built 1908, operated as the LIMP until 1938) and because the first
> 3 years of operation included the Vanderbilt Cup Races which are
> important to Ghost Tracks.
> 
> the LIMP brings up something i’d  not considered before - adapting the
> OSM highway tagging system for historic mapping. for 1908, the LIMP was
> an advanced road - all concrete, limited number of access points, wider
> than most. because of that, i’ve temporarily tagged what i’ve entered as
> trunk. but by the end of its life as a standalone entity it was
> obsolete, and NYS declined to add it to the state parkway system because
> it was so far behind the new roads that Robert Moses was building. at
> best in 1938 it was secondary. the longest existing piece today is
> a tertiary county route. so what do we want to do?
> 
> richard
> -- 
> rwelty at averillpark.net
> Averill Park Networking - GIS & IT Consulting
> OpenStreetMap - PostgreSQL - Linux
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> 
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