Hi,
I have some geometries that straddle the antimeridian (180/-180 longitude).
I enabled continuous wrapping as explained in this post:
http://geo-solutions.blogspot.com/2010/02/geoserver-continuous-map-wrapping.html
<http://geo-solutions.blogspot.com/2010/02/geoserver-continuous-map-wrapping.html>...but
was still struggling with them for a while until I shifted one side of the
longitudes to match the sign of the other. This properties file gives
example geometries:
_=id:Integer,name:String,location:Geometry:srid=4326
test.1=1|Clockwise|POLYGON((-179 68,-179 67,179 67,179 68,-179 68))
test.2=2|Counterclockwise|POLYGON((-179 65,179 65,179 64,-179 64,-179 65))
test.3=3|Clockwise Shifted|POLYGON((-179 62,-179 61,-181 61,-181 62,-179
62))
test.4=4|Counterclockwise Shifted|POLYGON((-179 59,-181 59,-181 58,-179
58,-179 59))
The original geometries (1 and 2) stretch across the earth in the wrong
direction, while the shifted geometries properly sit across the antimeridian
(3 and 4). Ring orientation didn't affect the result.
Is the best practice for serving this data via GeoServer to shift the
longitudes so that they are all of the same sign (e.g. with the
PostGIS ST_Shift_Longitude function)? Or am I missing another way?
Thanks,
Shane
--
Shane StClair
Software Engineer
Axiom Consulting & Design
523 W 8th Ave
Suite 104
Anchorage, AK 99501
http://www.axiomalaska.com
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