Hi Russell, maybe you have followed the conversation ? If so, you will
see that I think we do need a new approach but are unlikely to get it
'approved' ? Oh well, won't be the first fight I have lost !
So, the fall back is really as now doc'ed on the Australian Tagging
Guidelines.
Use 4wd_only if its a 4x4 road, officially the only option is 'yes' but
I recommend people also use 'recommended' in cases where its marginal.
And 'extreme' for the really wild cases.
Note that your efforts will not appear distinctively on (eg) the main
slippery map on the OSM website. I have opened a ticket with the map
maintainers but no answer yet. Hmm...
All roads should have highway=[track, unclassified, tertiary, etc] and
source=survey and surface=unpaved. I'd also consider using tracktype=
but note that it will only be rendered differently if highway=track.
And, to make it worse, the roughest (ie the most fun) track is
officially grade5. As defined, that might be OK in England, pretty silly
in Oz. If you use grade6, grade7 and grade8 the OSM maps will show the
track as a grade3, thats potentially dangerous but really the correct
thing to do.
Sigh .
The best way to handle changing conditions down the length of a road
(IMHO) is to break the road up into ways that have similar
characteristics and join them using merged nodes. That is, don't merge
the ways into one way.
It does not make sense to have sections that cannot be accessed
externally if you see what I mean ? Any discrete section should be
labeled with the worse case bit.
Hope this helps. And I hope you had a great time collecting that data !
David
On Sun, 2012-12-16 at 17:50 +1100, Russell Edwards wrote:
Could I ask a newbie question on this topic?
I want to update some roads that are 4wd-only in certain sections.
Any new approach aside, what is the best way to do this -- a) what tag
do I use, and b) how do I handle the changing traversibility - separate
ways linked as a route, or... ?
Thanks in advance
Russell
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