[postgis-tickets] [PostGIS] #3805: No way to create geography that croses -180..180 (date-line)
PostGIS
trac at osgeo.org
Fri Aug 11 13:04:00 PDT 2017
#3805: No way to create geography that croses -180..180 (date-line)
------------------------+---------------------------
Reporter: OlegSerov | Owner: pramsey
Type: defect | Status: closed
Priority: medium | Milestone: PostGIS 2.3.4
Component: postgis | Version: 2.3.x
Resolution: invalid | Keywords:
------------------------+---------------------------
Changes (by pramsey):
* status: new => closed
* resolution: => invalid
Comment:
The fact that the 3-space volumetric bounds of alaska and alberta
intersect (true) does not mean that the actual geographies do, as can be
seen by running the exact test.
{{{
SELECT ST_Intersects(ST_GeogFromText('POLYGON((-116.614 61.7534,-109.804
61.7534,-109.804 57.5029,-116.614 57.5029,-116.614 61.7534))'),
(ST_GeogFromText(' POLYGON((172.347846 71.441059,-173.233993
71.441059,-158.815832 71.441059,-144.397672 71.441059,-129.979511
71.441059,-129.979511 51.175092,-144.397672 51.175092,-158.815832
51.175092,-173.233993 51.175092,172.347846 51.175092,172.347846
71.441059))')));
}}}
The && operator is not comparing the things you think. These aren't
squares drawn on a map, they are volumes in R3 that contain the shapes in
S2 described by your geographies. If you need a correct result, use the
actual ST_Intersects() function.
--
Ticket URL: <https://trac.osgeo.org/postgis/ticket/3805#comment:1>
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