Geometry Boost List: Re: [geometry] intersects returns incorrect result in spherical equatorial

Subject: Re: [geometry] intersects returns incorrect result in spherical equatorial
From: Terry Hole (hujie.eagle_at_[hidden])
Date: 2013-09-25 00:50:59

New ticket filed:Ticket #9162

Thanks!

On Tue, Sep 24, 2013 at 6:02 PM, Barend Gehrels <barend_at_[hidden]> wrote:

> Hi Terry,
>
>
> Op 24 sep. 2013 om 10:43 heeft Terry Hole <hujie.eagle_at_[hidden]> het
> volgende geschreven:
>
> > Hi,
> >
> > The intersects does not return the correct result for point in polygon
> with spherical equatorial.
> > These are two cases:
> > 1. a polygon with pole (north/south) in it
> >     assume polygon PL: POLYGON((0 80,-90 80, -180 80, 90 80, 0 80))
> >     a point P: POINT(0 90)
> >     boost::geometry::intersects(P, PL) should return TRUE, but return
> false in boost 1.54.
> > 2. point in the opposite side of the polygon
> >     assume polygon PL: POLYGON((30 0,30 30,90 30, 90 0, 30 0))
> >     a point P: POINT(-120 21)
> >     boost::geometry::intersects(P, PL) should return FALSE, but return
> true in boost 1.54.
> >
> > The issue may be caused by the spherical_side_formula can not handle
> this two cases.
>
> Yes, polygons over the pole are not handled correctly. I kind of knew
> this, it has to be fixed once. Can you create  Boost Ticket with this
> program? If not, I will do it.
>
>
> Thanks for your report,
> Barend
>
>
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