From frankie at frankieroberto.com  Sun Jun 28 12:41:40 2009
From: frankie at frankieroberto.com (Frankie Roberto)
Date: Sun, 28 Jun 2009 17:41:40 +0100
Subject: [Osmlib-devel] Measuring the length of a way
Message-ID: <1350f7a40906280941y65c68fbby3b5cf0c5cb52932f@mail.gmail.com>

Hi,

Just found this gem - nice work!

Thought I'd post a quick problem I'm trying to solve here, in case you can
help point me at a solution.  Given a way retrieved from OSM, what would be
the best way of calculating its total length (in say, metres or
kilometres)?  Does this formula look like the right one?:
http://stackoverflow.com/questions/27928/how-do-i-calculate-distance-between-two-latitude-longitude-points

Second question: any chance we could include this method in the gem? :-)

Frankie

-- 
Frankie Roberto
Experience Designer, Rattle
0114 2706977
http://www.rattlecentral.com
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From jochen at remote.org  Mon Jun 29 02:17:21 2009
From: jochen at remote.org (Jochen Topf)
Date: Mon, 29 Jun 2009 08:17:21 +0200
Subject: [Osmlib-devel] Measuring the length of a way
In-Reply-To: <1350f7a40906280941y65c68fbby3b5cf0c5cb52932f@mail.gmail.com>
References: <1350f7a40906280941y65c68fbby3b5cf0c5cb52932f@mail.gmail.com>
Message-ID: <20090629061721.GA11215@eldorado.topf.org>

On Sun, Jun 28, 2009 at 05:41:40PM +0100, Frankie Roberto wrote:
> Thought I'd post a quick problem I'm trying to solve here, in case you can
> help point me at a solution.  Given a way retrieved from OSM, what would be
> the best way of calculating its total length (in say, metres or
> kilometres)?  Does this formula look like the right one?:
> http://stackoverflow.com/questions/27928/how-do-i-calculate-distance-between-two-latitude-longitude-points

Haven't checked the formula, but "great-circle distance" and "Haversine"
formula, are definitely right.

> Second question: any chance we could include this method in the gem? :-)

osmlib is for OSM related stuff, calculating great-circle distance or other
geometry functions should probably go into a geo library such as GeoRuby.

Jochen
-- 
Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-721-388298


From frankie at frankieroberto.com  Mon Jun 29 04:58:45 2009
From: frankie at frankieroberto.com (Frankie Roberto)
Date: Mon, 29 Jun 2009 09:58:45 +0100
Subject: [Osmlib-devel] Measuring the length of a way
In-Reply-To: <20090629061721.GA11215@eldorado.topf.org>
References: <1350f7a40906280941y65c68fbby3b5cf0c5cb52932f@mail.gmail.com>
	<20090629061721.GA11215@eldorado.topf.org>
Message-ID: <1350f7a40906290158j2983391n978c99eb437a7f6e@mail.gmail.com>

On Mon, Jun 29, 2009 at 7:17 AM, Jochen Topf <jochen at remote.org> wrote:

> Thought I'd post a quick problem I'm trying to solve here, in case you can
> > help point me at a solution.  Given a way retrieved from OSM, what would
> be
> > the best way of calculating its total length (in say, metres or
> > kilometres)?  Does this formula look like the right one?:
> >
> http://stackoverflow.com/questions/27928/how-do-i-calculate-distance-between-two-latitude-longitude-points
>
> Haven't checked the formula, but "great-circle distance" and "Haversine"
> formula, are definitely right.
>

Thanks. Will investigate further.


> > Second question: any chance we could include this method in the gem? :-)
>
> osmlib is for OSM related stuff, calculating great-circle distance or other
> geometry functions should probably go into a geo library such as GeoRuby.


Fair point. I'll check out what existing Ruby geo gems there are out there.

Frankie

-- 
Frankie Roberto
Experience Designer, Rattle
0114 2706977
http://www.rattlecentral.com
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