[postgis-users] problem with polygons spanning across 180E

sige sigenz at yahoo.co.nz
Mon Mar 16 18:28:16 PDT 2009

Thank you for your response. It seems there is no easy work around, and i
need to store the data as multipolugons and a program is needed to tell
whether a polygon intersects the dateline.


Paul Ramsey-4 wrote:
> None of the systems mentioned understand geographic coordinates as
> having a "wrap point" at 180. They are treated as planar, naturally
> your polygons connect across the central meridian instead of the
> dateline.
> The only "solution" is to force your data to respect the dateline by
> cutting it in half at 180/-180

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