On Sun, Feb 8, 2015 at 8:53 PM, Robert Coup <[email protected]>
wrote:
> One thing I'm wary of is that (AFAIK) the lat-long bounding box is
> normally calculated from a reprojected native bounding box.
>
> Transforming 4x points is not adequate to transform the area covered by
> that box, and there are several cases where valid data can be excluded in
> the resulting lat-lon bounds. Mapnik and other tools work around this by
> synthesizing 20(?) intermediate points along each side of the native box,
> transforming the polygon, then taking the extent of that polygon to get the
> final transformed bounds. And dealing with anti-meridian issues along the
> way.
>
> If GeoServer is starting to use lat-lon bounds for filtering (rather than
> as indicative areas) then maybe a similar approach should be adopted.
> 0°>360° or -360°>+360° data should probably also be taken into account.
>
GeoServer actually has more sophisticated logic, than just reprojecting 20
intermediate points. We do that as a starting point, but also have extra
checks
for singularity points (poles and dateline) to properly handle those cases
as well.
Cheers
Andrea
--
==
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Ing. Andrea Aime
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