Geometry Boost List: [ggl] distance point to segment on sphere/ellipsoid

Subject: [ggl] distance point to segment on sphere/ellipsoid
From: Barend Gehrels (Barend.Gehrels)
Date: 2010-03-17 08:32:49

Hi,

Welcome to the list.

tulinski wrote:
> Hello,
>
> I've got following results for distance (point to segment) computation after
> run example:
> https://svn.boost.org/svn/boost/sandbox/geometry/libs/geometry/example/extensions/gis/latlong/distance_example.cpp
>
> The Hague - line Amsterdam,Rotterdam
> in RD: 18.8992
> in LL: 3.66211e-06
>
> Rotterdam - line Amsterdam,the Hague
> in RD: 20.6565
> in LL: 3.41797e-06
>
> Is it sth wrong with distance(point_ll_deg, segment_ll_deg) invocation?
>
>   
Yes, surprising indeed. It apparently currently runs on a unit sphere, 
so you have to multiply with the earth radius. I fixed the sample, but 
it will be refactored later on. Note that the extensions currently do 
not have core attention because of incorporation in Boost. However, I 
must have broken something and will repair it in a few weeks.

Thanks for the report.

Regards, Barend

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