Hi Phil,
I discussed this with EPSG some years back - with respect to a coordinate
system which replicated EPSG:4326 in a 0-360 longitude space (which I think
would solve the ongoing 180 issues). They said that EPSG:4326 supported +-180
as well as 0-360 so there was no need for a new code, which I thought then, &
still do, was a bit shortsighted - even if technically correct.
While ESRI can accept 0-360 data as EPSG:4326, any coordinate reprojection will
always generate values in a +-180 space - a flag to specify which you want &
convert accordingly is not available.
We have funded solutions in gdal & Postgis which work for points, & for lines &
polygons which are not intersecting the 180 meridian, but have no solutions for
such features which do. I have done this for some datasets, but it involves
splitting & joining features as you note. This is non-trivial in the data as
doing this changes feature ID's - and I'm not aware of any rendering solution
that successfly splits or joins the polygons on the fly. (Though you can "join"
polygons that are split by plotting with no border, so the two parts appear as
one).
The topological changes as well as reprojection is rquired. The geography
datatype in Postgis is one step forward.
If you are looking for a collaborator & possible funder to support initiatives
to address this in the OSGEO space, I'm there!!
Cheers,
Brent Wood
________________________________
From: Phil Scadden <p.scad...@gns.cri.nz>
To: geoserver users <geoserver-users@lists.sourceforge.net>;
geotools-gt2-us...@lists.sourceforge.net
Sent: Thursday, February 13, 2014 9:41 AM
Subject: [Geoserver-users] Polygon's crossing the 180 line. Has anyone got a
successful recipe?
My usual experience with polygons that cross the 180 line, is that on
rendering, the polygon gets split on 180 with ugly line down the 180.
Data source is arcSDE. I am unsure whether the problem originates with
the store (ie arcSDE) or within geoserver. Polygons are rendered
correctly across other tile boundaries, but not this one. With line
geometries we have some success by generating the geometry offset
(entirely on one side of the 180) , and then shifting into correct
position, but doesnt work for polygons.
Does anyone have polygons rendering properly, and if so, how are you
doing it? (what data store, what extents/projection, how created).
Thanks
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