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Subject: Re: [geometry] Segment to Segment Distance
From: Barend Gehrels (barend_at_[hidden])
Date: 2012-05-21 15:46:00

Hi Dan,

On 19-5-2012 19:44, Dan Chianucci wrote:
> Hey guys,
> I'm trying to find the minimum distance between two segments, however
> this feature doesn't seem to be supported
> Shows that this is true, however replacing the 1_49_0 with a 1_48_0
> shows that it did in fact used to be supported. I am currious as to
> why this support was removed. Or are the charts on the previous
> version documentation incorrect?

Yes, sorry. The charts on previous version docs were not always correct.
So segment-segment is not yet supported. Not that it is difficult, it is
just not yet done. So it was also not yet there in 1.48

> It seems like the latter may be the case as the tables on the previous
> versions site seem to be incorrect.

Yes, there were more incorrections in the previous version docs. They
are enhanced now using another system of generation (thanks to Bruno).

> Eg. Going down the MultiLineString column says that the distance
> operation for MultiLineString can be computed against all other
> geometries except Segment, Box and Ring. However going across the
> MultiLineString row says the only supported geometries are Point,
> MultiPoint, and MultiLineString.

So yes, that was wrong too. If the matrix is not symmetric, it is
(probably) incorrect. Currently the distance support matrix is symmetric
and afaik correct.

Thanks, Barend

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