[OSM-talk] Keep Mapnik relevant
chillly809 at yahoo.co.uk
Thu Jan 1 22:04:04 GMT 2009
>> I notice that abandoned railways are now being rendered on Mapnik.
> This was discussed a bit on talk-gb recently:
> (and related messages)
> There are/were quite a few "railway=abandoned" features marked around
> the Derby/Notts border in the UK. Although many have been reused as
> cycle tracks etc., many haven't, and of those that haven't there's
> often nothing left visible on the ground at all. In those cases I've
> gone for "railway=dismantled", rather than just deleting the way
> entirely, as it seems a shame to remove information that someone else
> has added that isn't actually "wrong".
> Way 27144373 is an example - it's a section of the former Great
> Central railway that runs more-or-less parallel with a former colliery
> railway (the GCR was actually the later addition, but by the time of
> the NPE mapping the colliery railway appears to have become disused).
> A modern cycle trail follows much of the GCR, but not this bit (it
> follows the older colliery railway).
> However, way 14837306 here:
> shows a problem with this approach - Mapnik renders the name, but not
> the actual way. This is one where some sections probably justify
> being left as "railway=abandoned", as there is more evidence on the
> ground (although rendering it on a "standard map" is likely to cause
Changing a tag from railway=abandoned to railway=dismantled just to stop
it rendering is one of the no-nos in OSM: tagging for the renderer. It
would be much better to tag the line correctly and fix the renderer so
they don't render on the Mapnik map. Then a railway map or historic map
could render it properly.
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