Thanks for the reply. I have a bizarre behavior with version 1.5.8/GEOS
3.3.3. I'll try to extract a test case in order to discuss it in more
detail.
Thanks for the replies,
Peter
On 10/18/2013 03:39 PM, Nicklas Avén wrote:
If I understand you right your assumption is true.
What makes you wondering?
In 2d you will always get the distance to a vertexpoint in at least
one of the two geometries.
You can use ST_ShortestLine to see between what points the distance is
calculated.
So:
SELECT ST_Distance('LINESTRING(1 1, 1 10)'::geometry, 'LINESTRING(2 5,
10 5)'::geometry);
returns 1
and
SELECT ST_AsText(ST_ShortestLine('LINESTRING(1 1, 1 10)'::geometry,
'LINESTRING(2 5, 10 5)'::geometry));
returns 'LINESTRING(1 5, 2 5)'::geometry
geography type calculations is of course another story.
HTH
Nicklas
2013-10-18 Peter Hopfgartner wrote:
I took it for granted, that ST_Distance between two two dimensional
>geometries followes the definition of
>
>dist(A, B) = inf(d(a,b)), where a is an arbitrary point in set A and b
>an arbitrary point in set B and d() is the euclidean distance
>
>For some reason I'm now wondering if my assumption is true.
>
>Thanks for your patience,
>
>Peter
>
>--
>Peter Hopfgartner
>R3 GIS
>
>web : http://www.r3-gis.com
>
>_______________________________________________
>postgis-users mailing list
>[email protected]
>http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
>
>
_______________________________________________
postgis-users mailing list
[email protected]
http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
--
Peter Hopfgartner
R3 GIS Srl - GmbH
Via Johann Kravogl-Str. 2
I-39012 Meran/Merano (BZ)
web : www.r3-gis.com
mail : [email protected]
phone: +39 0473 494949
fax : +39 0473 069902
ATTENZIONE! Le informazioni contenute nella presente e-mail e nei documenti
eventualmente allegati sono confidenziali. La loro diffusione, distribuzione
e/o riproduzione da parte di terzi, senza autorizzazione del mittente è vietata
e può violare il D. Lgs. 196/2003. In caso di ricezione per errore, Vogliate
immediatamente informare il mittente del messaggio e distruggere la e-mail.
ACHTUNG! Die in dieser Nachricht oder in den beigelegten Dokumenten
beinhalteten Informationen sind streng vertraulich. Ihre Verbreitung und/oder
ihre Wiedergabe durch Dritte ist ohne Erlaubnis des Absenders verboten und
verstößt gegen das Legislativdekret 196/2003. Sollten Sie diese Mitteilung
irrtümlicherweise erhalten haben, bitten wir Sie uns umgehend zu informieren
und anschließend die Mitteilung zu vernichten.
WARNING! This e-mail may contain confidential and/or privileged information. If
you are not the intended recipient (or have received this e-mail in error)
please notify the sender immediately and destroy this e-mail. Any unauthorised
copying, disclosure or distribution of the material in this e-mail is strictly
forbidden and could be against the law (D. Lgs. 196/2003)
_______________________________________________
postgis-users mailing list
[email protected]
http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
