[postgis-users] Display GEOGRAPHY polygons crossing date line

[iam_gilbey]

Thanks for that info - it's something else to consider.

Conclusion: Google Earth cannot display GEOGRAPHY data that crosses that
date line, without a hack such as making a table of split geographies.

Does anyone disagree? (please disagree...!)

Thanks, James

On 12 October 2012 17:47, Paul Ramsey-4 [via PostGIS] <
ml-node+s17n5000464h47 at n6.nabble.com> wrote:

> Even if you split the shapes, GEarth renders polygons in a non-normal
> kind of way which you might find unacceptable
>
> http://blog.opengeo.org/2010/08/10/shape-of-a-polygon/
>
> The quick fix is to render them as lines, not polygons. there's no fix
> to get them to fill using great circle edges, GEarth just doesn't work
> that way.
>
> P.
>
> On Fri, Oct 12, 2012 at 4:03 AM, iam_gilbey <[hidden email]<http://user/SendEmail.jtp?type=node&node=5000464&i=0>>
> wrote:
>
> > I have many polygons, including several that cross the date line. They
> are
> > stored as GEOGRAPHY and work perfectly with PostGIS v2.0.1, PostgreSQL
> 9.1.3
> > on windows XP. I can serve this data using Geoserver (v2.1), and view it
> > using open layers, where the polygons crossing the date line render
> > correctly.
> >
> > I cannot however convert the data into KML (viewed in Google Earth 5.1),
> or
> > view it in Quantum GIS (v1.7), without the date line polygons being
> wrapped
> > around the earth.
> >
> > I appreciate that this isn't strictly a postGIS problem, however being
> faced
> > with the stark choice between splitting my data about the date line
> > (inelegant) or not using Google Earth (unacceptable to users), I don't
> know
> > where else to turn!
> >
> > Do you know of:
> > a) a way to get the data to render correctly in Google Earth; or
> > b) where else I should ask?
> >
> > Thanks!
> >
> >
> >
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