[postgis-users] Why should these boxes intersect?

[Paul Ramsey]

Your pacific polygon crosses the dateline. Dateline handling is
fraught. http://blog.opengeo.org/2010/08/10/shape-of-a-polygon/

For the Geometry type, we just don't do it. We assume a cartesian
plane, so your "pacific" polygon is actually a world-girdling huge
polygon that runs from the far west to the far east.
For the Geography type, you should find you get the right answer.

P.

On Wed, Jul 11, 2012 at 8:10 AM, DrYSG <ygutfreund at draper.com> wrote:
> Try this in PostGIS 2.0 and tell me why this should return true?
>
> SELECT ST_Intersects(
>         st_geomfromtext('SRID=4326;POLYGON((174.375 51.9230769,-168.75
> 51.9230769,-168.75 41.5384615,174.375 41.5384615,174.375 51.9230769))'),
>         st_geomfromtext('SRID=4326;POLYGON((-70.89651028442381
> 42.462445702609216,-71.23948971557616 42.462445702609216,-71.23948971557616
> 42.269406003536325,-70.89651028442381 42.269406003536325, -70.89651028442381
> 42.462445702609216))')
>         );
>
> I.E I don't think a box in the Boston area should intersect one in the
> northern pacific. Am I wrong?
>
> --
> View this message in context: http://postgis.17.n6.nabble.com/Why-should-these-boxes-intersect-tp4998895.html
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