Re: [OSM-talk] Length of ways

[mmd]

Am 01.12.2017 um 01:15 schrieb Andy Mabbett:
> Do we have a tool that will give me the length of a way (or a
> relation, made from several continuous ways)?
> 

The next Overpass API release will come with a handy operator to
calculate a way's length in meters.

Please check the following preview example to get a first idea on how
this will work: http://overpass-turbo.eu/s/tsJ


-- 


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Re: [OSM-talk] Length of ways

[Mike Thompson]

On Thu, Nov 30, 2017 at 6:13 PM, Martin Koppenhoefer  wrote:

> I’m not sure if this is still valid, but a long time ago the measurements
> in Josm weren’t very accurate...

It uses the great circle distance[0], which is accurate to about 0.5%[1],
still over long distances that can add up.  I believe it would be more
accurate to project each segment of the way to a local coordinate system
and measure, and then sum the measures.

Mike

[0]
https://josm.openstreetmap.de/browser/josm/trunk/src/org/openstreetmap/josm/data/osm/Way.java
(search on getLength)
[1] https://en.wikipedia.org/wiki/Great-circle_distance

especially for long distances, where the curvature of the earth leads to
> significant errors if not accounted for. Don’t know whether Josm uses an
> ellipsoid or spheroid (I recall initially it used carthesian coordinates
> and calculated in a plane). Just wanted to mention it.
>
> There’s also a measurement plugin for josm.
>
> cheers,
> Martin
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Re: [OSM-talk] Length of ways

[Martin Koppenhoefer]

I’m not sure if this is still valid, but a long time ago the measurements in 
Josm weren’t very accurate, especially for long distances, where the curvature 
of the earth leads to significant errors if not accounted for. Don’t know 
whether Josm uses an ellipsoid or spheroid (I recall initially it used 
carthesian coordinates and calculated in a plane). Just wanted to mention it.

There’s also a measurement plugin for josm.

cheers,
Martin 
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Re: [OSM-talk] Length of ways

[Andy Mabbett]

On 1 December 2017 at 00:45, Mike Thompson  wrote:

> Relation length:
> In JOSM
> Select a member way
> In the "tags/memberships" window scroll down to the "Member of" section
> Right click
> Select members (add)
> Note the length in the lower margin of JOSM's main window

Really, really, useful. Thank you.

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Andy Mabbett
@pigsonthewing
http://pigsonthewing.org.uk

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Re: [OSM-talk] Length of ways

[Andy Mabbett]

On 1 December 2017 at 00:20, Mike Thompson  wrote:

> On Thu, Nov 30, 2017 at 5:15 PM, Andy Mabbett 
> wrote:
>>
>> Do we have a tool that will give me the length of a way (or a
>> relation, made from several continuous ways)?

> If you select the way in JOSM it will give you the length in the lower
> margin of the window.

I'm a JOSM user, and I'd never noticed that! Thank you.

> I don't know about relations.

I'll add a feature request, tomorrow.

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Andy Mabbett
@pigsonthewing
http://pigsonthewing.org.uk

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Re: [OSM-talk] Length of ways

[Mike Thompson]

Relation length:
In JOSM
Select a member way
In the "tags/memberships" window scroll down to the "Member of" section
Right click
Select members (add)
Note the length in the lower margin of JOSM's main window

On Thu, Nov 30, 2017 at 5:20 PM, Mike Thompson  wrote:

> If you select the way in JOSM it will give you the length in the lower
> margin of the window.  I don't know about relations.
>
> On Thu, Nov 30, 2017 at 5:15 PM, Andy Mabbett 
> wrote:
>
>> Do we have a tool that will give me the length of a way (or a
>> relation, made from several continuous ways)?
>>
>> --
>> Andy Mabbett
>> @pigsonthewing
>> http://pigsonthewing.org.uk
>>
>> ___
>> talk mailing list
>> talk@openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/talk
>>
>
>
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Re: [OSM-talk] Length of ways

[Imre Samu]

For a batch solution:
* Pyosmium has an osm "road length" example:
https://github.com/osmcode/pyosmium/blob/master/examples/road_length.py


2017-12-01 1:15 GMT+01:00 Andy Mabbett :

> Do we have a tool that will give me the length of a way (or a
> relation, made from several continuous ways)?
>
> --
> Andy Mabbett
> @pigsonthewing
> http://pigsonthewing.org.uk
>
> ___
> talk mailing list
> talk@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk
>
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Re: [OSM-talk] Length of ways

[Mike Thompson]

If you select the way in JOSM it will give you the length in the lower
margin of the window.  I don't know about relations.

On Thu, Nov 30, 2017 at 5:15 PM, Andy Mabbett 
wrote:

> Do we have a tool that will give me the length of a way (or a
> relation, made from several continuous ways)?
>
> --
> Andy Mabbett
> @pigsonthewing
> http://pigsonthewing.org.uk
>
> ___
> talk mailing list
> talk@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk
>
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[OSM-talk] Length of ways

[Andy Mabbett]

Do we have a tool that will give me the length of a way (or a
relation, made from several continuous ways)?

-- 
Andy Mabbett
@pigsonthewing
http://pigsonthewing.org.uk

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