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<div class="moz-cite-prefix">On 3/9/15 4:58 PM, Bryce Nesbitt wrote:<br>
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cite="mid:CAC9LFPcXXRHPwkWtsiHKJDCw60O=DMmbMSkt+ne_aLFikbhCzQ@mail.gmail.com"
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<div class="gmail_quote"><br>
<div>The broader point is intact.<br>
<br>
<div>When making sense of abandoned bridges and oddly
rounded buildings in various places, it is super helpful<br>
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to see the context of the prior railroad grade. It helps
in mapping from the air and on the ground.<br>
<br>
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<div>A given railway grade may (and often does) exist as
razed, abandoned, disused, and reused (e.g.
highway=residential or highway=service, leisure=park)
along it's length. So how can we represent the former
way, and the current use of each bit,<br>
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<div>in a rational way?<br>
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</blockquote>
it's probably worthwhile to consider OpenHistoricalMap as a resource
for<br>
recording information about spatial entities that no longer exist in
the modern<br>
world. this relieves us of the argument about representing them in
OSM.<br>
<br>
i am now in the opening phase of a campaign to describe old auto
racing<br>
venues in OHM; in some cases they are related to existing physical
entities<br>
(e.g., the first and second Watkins Glen Grand Prix courses used
public roads<br>
of the time, most of which still exist. likewise, many airport
courses have been<br>
used over the years and are no longer; but the airports frequently
still exist.<br>
these things go in OHM because while the physical entities still
exist, the<br>
racing usage is long gone.)<br>
<br>
the issue of how to relate OHM objects to OSM objects is an open
question;<br>
right now i am not attempting to provide links from OHM entities to
OSM<br>
entities and instead am depending on a leaflet application to use
OSM as a<br>
basemap to provide context.<br>
<br>
richard<br>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-abbreviated" href="mailto:rwelty@averillpark.net">rwelty@averillpark.net</a>
Averill Park Networking - GIS & IT Consulting
OpenStreetMap - PostgreSQL - Linux
Java - Web Applications - Search</pre>
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