Re: [Talk-us] MO Stare Road Classifications.

[Paul Johnson]

On Mon, Mar 6, 2017 at 12:01 PM, Nathan Mills  wrote:

> Typically state DOT functional classification freeway and expressway both
> imply limited, but not necessarily fully controlled, access, so trunk is a
> good first approximation. However, the DOT classification diverges enough
> from OSM tagging standards/consensus (such as it is in the US, anyway) that
> using it as anything more than a basic reference where decent satellite
> imagery and ground truth observations are unavailable is a bad idea.
>

Fully agreed.  In Oklahoma and Arkansas, there's plenty of county roads
that are barely passable with a capable 4x4 with decent ground clearance
and even a state highway that's never been paved.  And then at least
Missouri has two state highway systems with two very different
purposes...so Missouri's classifications don't map cleanly on an exact
basis but do map nicely when being internally consistent with the rest of
north america...
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Re: [Talk-us] MO Stare Road Classifications.

[Nathan Mills]

Typically state DOT functional classification freeway and expressway both imply 
limited, but not necessarily fully controlled, access, so trunk is a good first 
approximation. However, the DOT classification diverges enough from OSM tagging 
standards/consensus (such as it is in the US, anyway) that using it as anything 
more than a basic reference where decent satellite imagery and ground truth 
observations are unavailable is a bad idea.

It's better than nothing when looking at unreviewed stuff from the TIGER 
import, for sure, but that's about it.

-Nathan

On March 6, 2017 11:13:28 AM EST, Paul Johnson  wrote:
>On Mar 5, 2017 13:35, "OSM Volunteer stevea"
>
>wrote:
>
>
>I would say "almost, but not quite."  Interstate and Freeway, both
>highway=motorway.  Expressway, highway=trunk.
>
>
>If it's semi limited access (few to no driveways, a mix of at grade and
>grade separated junctions), I would call that a trunk.  Just a highway
>that
>isn't limited access? Not a motorway or trunk.
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Re: [Talk-us] MO Stare Road Classifications.

[Paul Johnson]

On Mar 5, 2017 13:35, "OSM Volunteer stevea" 
wrote:


I would say "almost, but not quite."  Interstate and Freeway, both
highway=motorway.  Expressway, highway=trunk.


If it's semi limited access (few to no driveways, a mix of at grade and
grade separated junctions), I would call that a trunk.  Just a highway that
isn't limited access? Not a motorway or trunk.
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Re: [Talk-us] MO Stare Road Classifications.

[Frederik Ramm]

Hi,

On 03/05/2017 10:08 PM, Kevin Kenny wrote:
> I'm not a vehement anti-importer (there are a few around here

I don't know what you are talking about ;)

> There are "county
> highways" that you'd expect to be highway=tertiary that are in fact
> highway=track, for instance.

Or the myriad "highway=residential"s from TIGER that have lead to some
bicycle routing engines to ignore highway=residential/tiger_reviewed=no
in the US because they're often no more than dirt tracks.

A good way to deal with such external data sets as discussed here is to
massage them until they fit the objects on OSM, and then create a map
showing where the state highway department appears to differ from what's
in OSM (maybe using different colours for "their road class is higher
than ours" and "their road class is lower than ours"). Then we and/or
local mappers could investigate the differences and make adjustments
where deemed sensible.

And while our ODbL licensed data is probably not suitable for direct
back-import into the state highway department's database, they might
actually find such a comparison useful as well - maybe it can help them
spot errors in their own data.

Bye
Frederik

-- 
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Re: [Talk-us] MO Stare Road Classifications.

[Kevin Kenny]

On Sat, Mar 4, 2017 at 10:55 PM,  wrote:

>
>
> I was thinking of using MODOT Functional classification maps to set roads
> to.  Basically the following:
>
>
>
> MODOT : OSM
>
>
>
> Interstate : motorway
>
> Freeway and Expressway : trunk
>
> Other Principal Arterial : primary
>
> Minor Arterial : secondary
>
> Major Collector : tertiary
>
> Minor Collector : unclassified
>
> Local : residential
>
>
>

I'm not a vehement anti-importer (there are a few around here, but I'm not
among them!) but I feel compelled to ask: to what extent do we expect this
classification to be more accurate that what is already there? I come from
a part of the country where the official designations of highways describe
what sort of construction was once authorized, rather than what was
actually built or maintained. There are "county highways" that you'd expect
to be highway=tertiary that are in fact highway=track, for instance. Do we
have reason to expect that the state highway department has more accurate
or complete information than the Census Bureau had?

This caveat goes many-fold if you're looking at doing any sort of automated
reclassification, since there you also have to watch out for undoing the
work of local mappers who are familiar with the roads. If that's what
you're talking about, then it also needs to be talked about on the
'imports' list.
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Re: [Talk-us] MO Stare Road Classifications.

[OSM Volunteer stevea]

> I was thinking of using MODOT Functional classification maps to set roads to. 
>  Basically the following:
>  
> MODOT : OSM
>  
> Interstate : motorway
> Freeway and Expressway : trunk
> Other Principal Arterial : primary
> Minor Arterial : secondary
> Major Collector : tertiary
> Minor Collector : unclassified
> Local : residential

I would say "almost, but not quite."  Interstate and Freeway, both 
highway=motorway.  Expressway, highway=trunk.

The remainder seem correct, except that you might consider Local to also be 
highway=unclassified, unless you know Local to be explicitly abutted by 
residences in all cases, then highway=residential is distinctly correct.

SteveA
California
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Re: [Talk-us] MO Stare Road Classifications.

[Richard Welty]

On 3/5/17 8:22 AM, Mike N wrote:
> Hi,
>
>Typically, regional classifications do not map into OSM
> classification, and often conflict.
>
>   If a freeway / expressway is constructed as an OSM motorway, it
> should be motorway.
>
>   If a 'local' road serves an industrial area it should be
> unclassified because it doesn't serve residences.
>
>And probably others.   Even within OSM in the US, there is not an
> absolute level of classification that has been agreed on and
> verifiable by everyone.
>
> On 3/4/2017 10:55 PM, idn...@gmail.com wrote:
>>
>>
>> I was thinking of using MODOT Functional classification maps to set
>> roads to.  Basically the following:
>>
philosophically, in OSM we tend to focus on things verifiable on the
ground, rather
than things we get from official docs.

i could see setting up a separate namespace which could contain
functional classifications,
but i would object to trying to hijack long established tags which
others are already
working with. we've kind of been there before and it was unfortunate.

richard

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Re: [Talk-us] MO Stare Road Classifications.

[Paul Johnson]

On Sun, Mar 5, 2017 at 7:22 AM, Mike N  wrote:

> Hi,
>
>Typically, regional classifications do not map into OSM classification,
> and often conflict.
>
>   If a freeway / expressway is constructed as an OSM motorway, it should
> be motorway.
>

The american concept of freeways is unambiguous, though we do have some
oddities with expressways, which we map as trunks.

No/few driveways, usually surface intersections but could also have
motorway-style ramps at higher traffic junctions, or (far more rarely) a
controlled access single carriageway (it's a motorway, but instead of dual
carriageway, it's typically a two lane road at the top of the ramps) would
qualify as a trunk, as well.
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Re: [Talk-us] MO Stare Road Classifications.

[Mike N]

Hi,

   Typically, regional classifications do not map into OSM 
classification, and often conflict.


  If a freeway / expressway is constructed as an OSM motorway, it 
should be motorway.


  If a 'local' road serves an industrial area it should be unclassified 
because it doesn't serve residences.


   And probably others.   Even within OSM in the US, there is not an 
absolute level of classification that has been agreed on and verifiable 
by everyone.


On 3/4/2017 10:55 PM, idn...@gmail.com wrote:



I was thinking of using MODOT Functional classification maps to set
roads to.  Basically the following:



MODOT : OSM



Interstate : motorway

Freeway and Expressway : trunk

Other Principal Arterial : primary

Minor Arterial : secondary

Major Collector : tertiary

Minor Collector : unclassified

Local : residential



You can see maps here:

http://www.modot.org/newsandinfo./functionalclassificationmaps





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Re: [Talk-us] MO Stare Road Classifications.

[Paul Johnson]

On Sat, Mar 4, 2017 at 9:55 PM,  wrote:

>
>
> I was thinking of using MODOT Functional classification maps to set roads
> to.  Basically the following:
>
>
>
> MODOT : OSM
>
>
>
> Interstate : motorway
>
> Freeway and Expressway : trunk
>
> Other Principal Arterial : primary
>
> Minor Arterial : secondary
>
> Major Collector : tertiary
>
> Minor Collector : unclassified
>
> Local : residential
>
>
>
> You can see maps here:
>
> http://www.modot.org/newsandinfo../functionalclassificationmaps
>
>
http://wiki.openstreetmap.org/wiki/United_States_Road_Classification
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[Talk-us] MO Stare Road Classifications.

[idnwys]

I was thinking of using MODOT Functional classification maps to set roads to.  
Basically the following:

MODOT : OSM

Interstate : motorway
Freeway and Expressway : trunk
Other Principal Arterial : primary
Minor Arterial : secondary
Major Collector : tertiary
Minor Collector : unclassified
Local : residential

You can see maps here:
http://www.modot.org/newsandinfo../functionalclassificationmaps

Fearsyth
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