Hi Andrea,
Good to hear that suitable cleverness is hiding under the UI button :)
On Mon, Feb 9, 2015 at 9:01 AM, Andrea Aime <[email protected]>
wrote:
> 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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