[postgis-devel] st_dwithin, st_within, st_dcompletlywithin

[Paul Ramsey]

The patch included a docs patch.

On Wed, Jul 8, 2009 at 3:22 PM, Paragon Corporation<lr at pcorp.us> wrote:
> Oh that's what that is.  Hmm and I think its already ported to PostGIS,
> though would be interesting to compare the speeds and results.  Since the
> current one in trunk is a GEOS call and Nicklas' would be a native PostGIS.
>
> http://trac.osgeo.org/postgis/ticket/209
>
> Paul are you hmm planning add this to the manual -- I see you closed it?  I
> don't recall seeing it in the 1.5 docs or were we waiting for GEOS to be
> patched first?
>
> Thanks,
> Regina
>
>
> -----Original Message-----
> From: postgis-devel-bounces at postgis.refractions.net
> [mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of Martin
> Davis
> Sent: Wednesday, July 08, 2009 6:14 PM
> To: PostGIS Development Discussion
> Subject: Re: [postgis-devel] st_dwithin, st_within, st_dcompletlywithin
>
> That distance metric is known as the Hausdorff Distance.  It's implemented
> in JTS, and probably in GEOS as well.
>
> nicklas.aven at jordogskog.no wrote:
>>
>>
>> A function that gives the answer to for example:
>> "How far away from France can you get in Belgia"
>> To answer that we have to store compare the shortest distance to
>> geometry2 from each vertex in geometry1 and finaly find wich vertex in
>> geometry1 that has the highest "mindistance" to geometry2.
>> Hope the idee is possible to understand. Is it of any use?
>
> --
> Martin Davis
> Senior Technical Architect
> Refractions Research, Inc.
> (250) 383-3022
>
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