[Talk-us] cycle.travel US bike routing, and unreviewed rural TIGER

[Minh Nguyen]

On 2015-06-13 17:08, Harald Kliems wrote:
> Very nice, Richard! One quick comment: I might not be the only who
> doesn't always change the tiger:reviewed tag when fixing TIGER-imported
> roads. I don't know if that's technically feasible, but maybe it would
> be better to check if a way has been modified since import, independent
> of the tiger:reviewed tag. I guess you could assign those a slightly
> lower priority than the ones that have tiger:reviewed=yes.

You aren't alone. I stopped bothering with tiger:reviewed tags back in 
the Potlatch 1 days. It just isn't a well-designed tag:

- not very discoverable to mappers who weren't around in 2008
- not automatic enough
- doesn't say whether the names, classification, or geometry was 
reviewed, or whether the review covered the entire way

I think we generally treat tiger:* tags as cruft these days. (I 
sometimes use tiger:name_* in cleaning up erroneously merged ways or 
ways lossily "unduplicated" along county lines, but that's about it.)

On the other hand, ways without tiger:reviewed tags are more likely to 
have been entered by hand or rigorously reviewed, so it does make sense 
to reward such ways. But I think it'd be unfortunate to totally discount 
tiger:reviewed=no ways.

FWIW, I also leave a lot of usable paved roads as highway=residential in 
rural areas, but there are plenty of considerations that vary from 
region to region (even within a state).

> On Sat, Jun 13, 2015 at 1:38 PM Richard Fairhurst
> <richard at systemed.net
> <mailto:richard at systemed.net>> wrote:
>
>     Hi all,
>
>     At State of the Map US last weekend I was really pleased to unveil
>     bicycle routing for the US (and Canada) at my site, cycle.travel
>     <http://cycle.travel>.
>
>     The planner, at http://cycle.travel/map , will plan a bike route for you
>     between any two points - whether in the same city or on opposite sides
>     of the continent. It's all based on OSM data but also takes account of
>     elevation and other factors.
>
>     I "dogfooded" it with a three-day ride around New York state after
>     SOTM-US, and it found me some lovely quiet roads in and around the
>     Catskills. I hope it'll be equally useful for the other two-wheelers
>     amongst us. There's still a lot I want to add (as detailed at
>     http://cycle.travel/news/new_cycle_travel_directions_for_the_us_and_canada)
>     but I hope you enjoy it.
>
>     Plug aside, there's a couple of things might be relevant to US mappers.
>
>
>     First of all, I'm aiming high with this - the aim isn't just to make the
>     best OSM-powered bike router of the US, but the best bike router full
>     stop for commuters, leisure cyclists and tourers. (I leave the
>     "athletes" to Strava!)
>
>     Here in Britain, experience over the years has been that good bike
>     routing and good bike cartography - historically via CycleStreets and
>     OpenCycleMap - are a really effective way of driving contributions to
>     OSM. So if you know cyclists who aren't yet contributing to OSM, maybe
>     throw this at them - and if it doesn't find the route they'd recommend,
>     maybe there's some unmapped infrastructure they could be persuaded
>     to add!
>
>
>     Second, the routing and cartography both heavily distrust unreviewed
>     TIGER.
>
>     In other words, it won't route over a rural road tagged as
>              highway=residential
>              tiger:reviewed=no
>
>     Any road with tiger:reviewed removed or altered, any road in urban
>     areas, and any road with highway=unclassified or greater is assumed to
>     be a usable paved road. (There are a few additional bits of logic but
>     that's the general principle.)
>
>     Unreviewed rural residentials are shown on the map (high zoom levels) as
>     a faint grey dashed line, explained in the key as "Unsurveyed road".
>
>     I've been finding this a really useful way of locating unreviewed TIGER
>     and fixing it... it's actually quite addictive. :) Looking for roads
>     which cross rivers, or with long sweeping curves, is an easy way of
>     identifying quick wins. My modus operandi is to retag 2+-lane roads with
>     painted centrelines as tertiary, smaller paved roads as unclassified,
>     and just to take the tiger:reviewed tag off paved residential roads.
>     Anything unpaved gets a surface tag and/or highway=track.
>
>     I can't promise minutely updates I'm afraid - the routing/map update
>     process takes two full days to run so it'll be more monthly than
>     minutely. But I hope you find it as useful as I do. You'll see there's a
>     tiny little "pen" icon at the bottom right of http://cycle.travel/map
>     which takes you to edit the current location in OSM.
>
>
>     Finally, many thanks to everyone who's tested it so far, particularly
>     Steve All - your feedback was and continues to be enormously useful.
>
>     cheers
>     Richard
>
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-- 
minh at nguyen.cincinnati.oh.us