[OSM-newbies] How to use relations for The Chiltern Way and its extensions
niceman at att.net
Fri Aug 19 12:05:14 BST 2011
On 8/19/2011 6:22 AM, Bob Hawkins wrote:
> Its relation id is
> 1716283. I wonder, having created it, whether it should now be added as
> a single route element to the Chiltern Way relation?
There are several ways to look at route relations in OSM. One is the
classic 'route model', where the relation defines a single continuous
path from beginning to end. Automatic relation analysis tools can be
used to confirm / maintain the route connectivity. In practice
'routers' just route on the topological data and ignore route relations.
The other function of relations is to provide a convenient way to
download a list of related objects using a single editor command, rather
than downloading the entire bounding box that includes all relations
A good reason to have relations joined by super-relations is that it
allows different people to simultaneously edit ways in different areas
of the super-relation without creating an edit conflict.
I took a look at the Society diagram
http://www.chilternsociety.org.uk/about-ChltnWay.php to get an idea of
how the extensions are arranged. I would say that for this case, it
would make sense to have a relation for each named part of the trail,
and a super-relation to define the 'Chiltern Way' as a whole.
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